./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 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/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_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs --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-0f8a17c [2021-11-19 14:54:36,521 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:54:36,523 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:54:36,595 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:54:36,596 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:54:36,602 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:54:36,605 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:54:36,609 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:54:36,614 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:54:36,621 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:54:36,622 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:54:36,624 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:54:36,625 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:54:36,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:54:36,632 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:54:36,637 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:54:36,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:54:36,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:54:36,644 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:54:36,654 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:54:36,656 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:54:36,658 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:54:36,662 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:54:36,664 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:54:36,675 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:54:36,676 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:54:36,677 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:54:36,679 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:54:36,680 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:54:36,682 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:54:36,682 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:54:36,684 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:54:36,686 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:54:36,688 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:54:36,690 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:54:36,690 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:54:36,691 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:54:36,692 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:54:36,692 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:54:36,693 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:54:36,694 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:54:36,695 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-19 14:54:36,749 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:54:36,749 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:54:36,752 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:54:36,752 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:54:36,752 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:54:36,753 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:54:36,753 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:54:36,753 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 14:54:36,754 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:54:36,754 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:54:36,763 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 14:54:36,763 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 14:54:36,763 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:54:36,764 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 14:54:36,764 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 14:54:36,764 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 14:54:36,765 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:54:36,766 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 14:54:36,766 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:54:36,766 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:54:36,766 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:54:36,767 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:54:36,767 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 14:54:36,767 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:54:36,768 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:54:36,768 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:54:36,768 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:54:36,769 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:54:36,769 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:54:36,771 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:54:36,771 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:54:36,771 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:54:36,772 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 14:54:36,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 14:54:36,772 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:54:36,773 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:54:36,773 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:54:36,773 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_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-19 14:54:37,109 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:54:37,135 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:54:37,138 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:54:37,140 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:54:37,141 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:54:37,143 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/../../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 [2021-11-19 14:54:37,252 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/bcb64d03a/257b38ad477e485799f2d2d4e561dfa6/FLAG87ebeee61 [2021-11-19 14:54:38,410 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:54:38,411 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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 [2021-11-19 14:54:38,452 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/bcb64d03a/257b38ad477e485799f2d2d4e561dfa6/FLAG87ebeee61 [2021-11-19 14:54:38,768 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/bcb64d03a/257b38ad477e485799f2d2d4e561dfa6 [2021-11-19 14:54:38,771 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:54:38,773 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:54:38,776 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:54:38,776 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:54:38,780 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:54:38,781 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:54:38" (1/1) ... [2021-11-19 14:54:38,783 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c41d257 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:38, skipping insertion in model container [2021-11-19 14:54:38,783 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:54:38" (1/1) ... [2021-11-19 14:54:38,792 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:54:38,919 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:54:40,449 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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] [2021-11-19 14:54:40,585 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:54:40,631 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) [2021-11-19 14:54:40,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@62fbdf28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:40, skipping insertion in model container [2021-11-19 14:54:40,632 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:54:40,633 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-19 14:54:40,635 INFO L158 Benchmark]: Toolchain (without parser) took 1861.01ms. Allocated memory was 100.7MB in the beginning and 132.1MB in the end (delta: 31.5MB). Free memory was 58.4MB in the beginning and 88.3MB in the end (delta: -29.8MB). Peak memory consumption was 29.2MB. Max. memory is 16.1GB. [2021-11-19 14:54:40,637 INFO L158 Benchmark]: CDTParser took 0.39ms. Allocated memory is still 100.7MB. Free memory was 53.3MB in the beginning and 53.2MB in the end (delta: 77.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-19 14:54:40,638 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1856.93ms. Allocated memory was 100.7MB in the beginning and 132.1MB in the end (delta: 31.5MB). Free memory was 58.2MB in the beginning and 88.3MB in the end (delta: -30.0MB). Peak memory consumption was 29.2MB. Max. memory is 16.1GB. [2021-11-19 14:54:40,641 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39ms. Allocated memory is still 100.7MB. Free memory was 53.3MB in the beginning and 53.2MB in the end (delta: 77.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1856.93ms. Allocated memory was 100.7MB in the beginning and 132.1MB in the end (delta: 31.5MB). Free memory was 58.2MB in the beginning and 88.3MB in the end (delta: -30.0MB). Peak memory consumption was 29.2MB. 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_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/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_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs --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-0f8a17c [2021-11-19 14:54:43,074 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:54:43,078 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:54:43,118 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:54:43,119 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:54:43,121 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:54:43,123 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:54:43,125 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:54:43,127 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:54:43,129 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:54:43,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:54:43,131 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:54:43,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:54:43,134 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:54:43,135 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:54:43,137 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:54:43,138 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:54:43,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:54:43,143 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:54:43,148 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:54:43,153 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:54:43,155 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:54:43,158 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:54:43,161 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:54:43,168 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:54:43,172 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:54:43,173 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:54:43,176 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:54:43,178 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:54:43,179 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:54:43,179 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:54:43,180 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:54:43,182 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:54:43,183 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:54:43,185 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:54:43,186 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:54:43,187 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:54:43,187 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:54:43,188 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:54:43,190 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:54:43,191 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:54:43,192 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-19 14:54:43,238 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:54:43,238 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:54:43,240 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:54:43,240 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:54:43,241 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:54:43,241 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:54:43,241 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:54:43,241 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:54:43,242 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:54:43,242 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:54:43,244 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:54:43,245 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:54:43,245 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:54:43,245 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:54:43,246 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:54:43,246 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 14:54:43,246 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-19 14:54:43,246 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-19 14:54:43,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:54:43,247 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:54:43,247 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:54:43,247 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:54:43,248 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-19 14:54:43,248 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:54:43,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:54:43,249 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:54:43,249 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:54:43,249 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:54:43,249 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-19 14:54:43,250 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-19 14:54:43,250 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:54:43,250 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:54:43,250 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:54:43,251 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_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-19 14:54:43,690 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:54:43,737 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:54:43,741 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:54:43,743 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:54:43,744 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:54:43,746 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/../../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 [2021-11-19 14:54:43,827 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/50aefe378/78d56cd212ed41c6a4ef0b0da56d11ec/FLAG3ebef4861 [2021-11-19 14:54:44,704 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:54:44,704 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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 [2021-11-19 14:54:44,748 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/50aefe378/78d56cd212ed41c6a4ef0b0da56d11ec/FLAG3ebef4861 [2021-11-19 14:54:45,213 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/data/50aefe378/78d56cd212ed41c6a4ef0b0da56d11ec [2021-11-19 14:54:45,215 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:54:45,217 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:54:45,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:54:45,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:54:45,222 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:54:45,223 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:54:45" (1/1) ... [2021-11-19 14:54:45,224 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b1c1e8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:45, skipping insertion in model container [2021-11-19 14:54:45,224 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:54:45" (1/1) ... [2021-11-19 14:54:45,231 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:54:45,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:54:46,688 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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] [2021-11-19 14:54:46,783 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:54:46,848 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-19 14:54:46,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:54:47,258 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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] [2021-11-19 14:54:47,289 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:54:47,324 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 14:54:47,694 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/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] [2021-11-19 14:54:47,720 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:54:47,850 INFO L208 MainTranslator]: Completed translation [2021-11-19 14:54:47,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47 WrapperNode [2021-11-19 14:54:47,851 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:54:47,853 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 14:54:47,853 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 14:54:47,853 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 14:54:47,862 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:47,941 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,099 INFO L137 Inliner]: procedures = 167, calls = 606, calls flagged for inlining = 71, calls inlined = 71, statements flattened = 1775 [2021-11-19 14:54:48,100 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 14:54:48,100 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 14:54:48,101 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 14:54:48,101 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 14:54:48,111 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,127 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,129 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,251 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,281 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,311 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,342 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 14:54:48,348 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 14:54:48,348 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 14:54:48,349 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 14:54:48,350 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (1/1) ... [2021-11-19 14:54:48,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:54:48,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:54:48,386 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 14:54:48,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 14:54:48,447 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_set_intfdata_11 [2021-11-19 14:54:48,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_set_intfdata_11 [2021-11-19 14:54:48,448 INFO L130 BoogieDeclarations]: Found specification of procedure __raw_spin_lock_init [2021-11-19 14:54:48,448 INFO L138 BoogieDeclarations]: Found implementation of procedure __raw_spin_lock_init [2021-11-19 14:54:48,448 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_ioctl [2021-11-19 14:54:48,448 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_ioctl [2021-11-19 14:54:48,449 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-19 14:54:48,449 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_fill_bulk_urb_3 [2021-11-19 14:54:48,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_fill_bulk_urb_3 [2021-11-19 14:54:48,449 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_submit_urb_8 [2021-11-19 14:54:48,450 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_submit_urb_8 [2021-11-19 14:54:48,450 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-19 14:54:48,450 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_close [2021-11-19 14:54:48,450 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_close [2021-11-19 14:54:48,450 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-19 14:54:48,450 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-19 14:54:48,451 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-19 14:54:48,451 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-19 14:54:48,451 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-19 14:54:48,451 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-19 14:54:48,451 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-19 14:54:48,452 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-19 14:54:48,452 INFO L130 BoogieDeclarations]: Found specification of procedure usb_set_interface [2021-11-19 14:54:48,452 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_set_interface [2021-11-19 14:54:48,452 INFO L130 BoogieDeclarations]: Found specification of procedure free_netdev [2021-11-19 14:54:48,453 INFO L138 BoogieDeclarations]: Found implementation of procedure free_netdev [2021-11-19 14:54:48,453 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_submit_urb [2021-11-19 14:54:48,453 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_submit_urb [2021-11-19 14:54:48,453 INFO L130 BoogieDeclarations]: Found specification of procedure lowmem_page_address [2021-11-19 14:54:48,453 INFO L138 BoogieDeclarations]: Found implementation of procedure lowmem_page_address [2021-11-19 14:54:48,454 INFO L130 BoogieDeclarations]: Found specification of procedure usb_driver_release_interface [2021-11-19 14:54:48,454 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_driver_release_interface [2021-11-19 14:54:48,454 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2021-11-19 14:54:48,455 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2021-11-19 14:54:48,455 INFO L130 BoogieDeclarations]: Found specification of procedure netif_wake_queue [2021-11-19 14:54:48,455 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_wake_queue [2021-11-19 14:54:48,455 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-19 14:54:48,455 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-19 14:54:48,456 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-19 14:54:48,456 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-19 14:54:48,456 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_alloc_urb [2021-11-19 14:54:48,456 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_alloc_urb [2021-11-19 14:54:48,457 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_size_call_parameter [2021-11-19 14:54:48,457 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_disconnect [2021-11-19 14:54:48,457 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_disconnect [2021-11-19 14:54:48,457 INFO L130 BoogieDeclarations]: Found specification of procedure usbpn_set_mtu [2021-11-19 14:54:48,458 INFO L138 BoogieDeclarations]: Found implementation of procedure usbpn_set_mtu [2021-11-19 14:54:48,458 INFO L130 BoogieDeclarations]: Found specification of procedure skb_add_rx_frag [2021-11-19 14:54:48,458 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_add_rx_frag [2021-11-19 14:54:48,458 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-19 14:54:48,459 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-19 14:54:48,460 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-19 14:54:48,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-19 14:54:48,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-19 14:54:48,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-19 14:54:48,463 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-19 14:54:48,464 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-19 14:54:48,464 INFO L130 BoogieDeclarations]: Found specification of procedure rx_submit [2021-11-19 14:54:48,464 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_submit [2021-11-19 14:54:48,464 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-19 14:54:48,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-19 14:54:48,465 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-19 14:54:48,465 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-19 14:54:48,465 INFO L130 BoogieDeclarations]: Found specification of procedure netif_stop_queue [2021-11-19 14:54:48,465 INFO L138 BoogieDeclarations]: Found implementation of procedure netif_stop_queue [2021-11-19 14:54:48,466 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-19 14:54:48,466 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-19 14:54:48,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-19 14:54:48,466 INFO L130 BoogieDeclarations]: Found specification of procedure spinlock_check [2021-11-19 14:54:48,467 INFO L138 BoogieDeclarations]: Found implementation of procedure spinlock_check [2021-11-19 14:54:48,468 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 14:54:48,468 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int [2021-11-19 14:54:48,468 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int [2021-11-19 14:54:48,468 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-19 14:54:48,469 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-19 14:54:48,469 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-19 14:54:48,469 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE8 [2021-11-19 14:54:48,469 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE2 [2021-11-19 14:54:48,469 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2021-11-19 14:54:48,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2021-11-19 14:54:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-19 14:54:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-19 14:54:48,470 INFO L130 BoogieDeclarations]: Found specification of procedure put_page [2021-11-19 14:54:48,471 INFO L138 BoogieDeclarations]: Found implementation of procedure put_page [2021-11-19 14:54:48,471 INFO L130 BoogieDeclarations]: Found specification of procedure skb_end_pointer [2021-11-19 14:54:48,472 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_end_pointer [2021-11-19 14:54:48,472 INFO L130 BoogieDeclarations]: Found specification of procedure spin_unlock_irqrestore [2021-11-19 14:54:48,472 INFO L138 BoogieDeclarations]: Found implementation of procedure spin_unlock_irqrestore [2021-11-19 14:54:48,473 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-19 14:54:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-19 14:54:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-19 14:54:48,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-19 14:54:48,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-19 14:54:48,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-19 14:54:48,476 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-19 14:54:48,476 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-19 14:54:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-19 14:54:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure skb_put [2021-11-19 14:54:48,477 INFO L138 BoogieDeclarations]: Found implementation of procedure skb_put [2021-11-19 14:54:48,477 INFO L130 BoogieDeclarations]: Found specification of procedure _raw_spin_lock_irqsave [2021-11-19 14:54:48,477 INFO L138 BoogieDeclarations]: Found implementation of procedure _raw_spin_lock_irqsave [2021-11-19 14:54:48,478 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_priv [2021-11-19 14:54:48,478 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_priv [2021-11-19 14:54:48,478 INFO L130 BoogieDeclarations]: Found specification of procedure netdev_get_tx_queue [2021-11-19 14:54:48,478 INFO L138 BoogieDeclarations]: Found implementation of procedure netdev_get_tx_queue [2021-11-19 14:54:48,478 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_free_urb [2021-11-19 14:54:48,479 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_free_urb [2021-11-19 14:54:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-19 14:54:48,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 14:54:48,480 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 14:54:48,480 INFO L130 BoogieDeclarations]: Found specification of procedure rx_complete [2021-11-19 14:54:48,481 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_complete [2021-11-19 14:54:49,171 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 14:54:49,174 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 14:54:53,773 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-19 14:55:09,756 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 14:55:09,774 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 14:55:09,774 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-19 14:55:09,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:55:09 BoogieIcfgContainer [2021-11-19 14:55:09,778 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 14:55:09,780 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 14:55:09,781 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 14:55:09,784 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 14:55:09,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 02:54:45" (1/3) ... [2021-11-19 14:55:09,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1da45038 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:55:09, skipping insertion in model container [2021-11-19 14:55:09,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:54:47" (2/3) ... [2021-11-19 14:55:09,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1da45038 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:55:09, skipping insertion in model container [2021-11-19 14:55:09,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:55:09" (3/3) ... [2021-11-19 14:55:09,788 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 [2021-11-19 14:55:09,794 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 14:55:09,794 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 14:55:09,876 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 14:55:09,885 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 [2021-11-19 14:55:09,885 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 14:55:09,939 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) [2021-11-19 14:55:09,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-19 14:55:09,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:09,951 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] [2021-11-19 14:55:09,951 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:09,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:09,958 INFO L85 PathProgramCache]: Analyzing trace with hash 148447644, now seen corresponding path program 1 times [2021-11-19 14:55:09,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:09,974 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [29451327] [2021-11-19 14:55:09,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:09,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:09,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:09,979 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:09,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-19 14:55:10,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:10,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-19 14:55:10,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:11,183 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-19 14:55:11,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:11,615 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-19 14:55:11,616 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:11,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [29451327] [2021-11-19 14:55:11,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [29451327] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:55:11,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:55:11,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2021-11-19 14:55:11,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499624013] [2021-11-19 14:55:11,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:11,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-19 14:55:11,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:11,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-19 14:55:11,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-19 14:55:11,674 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) [2021-11-19 14:55:11,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:11,800 INFO L93 Difference]: Finished difference Result 1191 states and 1659 transitions. [2021-11-19 14:55:11,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-19 14:55:11,803 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 [2021-11-19 14:55:11,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:11,837 INFO L225 Difference]: With dead ends: 1191 [2021-11-19 14:55:11,841 INFO L226 Difference]: Without dead ends: 584 [2021-11-19 14:55:11,853 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 [2021-11-19 14:55:11,861 INFO L933 BasicCegarLoop]: 812 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:11,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 812 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:55:11,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-11-19 14:55:12,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 584. [2021-11-19 14:55:12,012 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) [2021-11-19 14:55:12,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 793 transitions. [2021-11-19 14:55:12,030 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 793 transitions. Word has length 78 [2021-11-19 14:55:12,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:12,032 INFO L470 AbstractCegarLoop]: Abstraction has 584 states and 793 transitions. [2021-11-19 14:55:12,032 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) [2021-11-19 14:55:12,032 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 793 transitions. [2021-11-19 14:55:12,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-19 14:55:12,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:12,047 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] [2021-11-19 14:55:12,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:12,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:55:12,272 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:12,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:12,273 INFO L85 PathProgramCache]: Analyzing trace with hash 354669602, now seen corresponding path program 1 times [2021-11-19 14:55:12,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:12,275 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [436946419] [2021-11-19 14:55:12,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:12,275 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:12,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:12,278 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:12,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-19 14:55:12,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:12,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 14:55:13,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:13,422 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-19 14:55:13,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:14,018 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:14,019 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:14,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [436946419] [2021-11-19 14:55:14,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [436946419] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:55:14,020 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-19 14:55:14,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-19 14:55:14,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802087856] [2021-11-19 14:55:14,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:14,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:14,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:14,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:14,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-19 14:55:14,024 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) [2021-11-19 14:55:14,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:14,243 INFO L93 Difference]: Finished difference Result 1162 states and 1578 transitions. [2021-11-19 14:55:14,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:55:14,244 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 [2021-11-19 14:55:14,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:14,253 INFO L225 Difference]: With dead ends: 1162 [2021-11-19 14:55:14,259 INFO L226 Difference]: Without dead ends: 585 [2021-11-19 14:55:14,262 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 [2021-11-19 14:55:14,264 INFO L933 BasicCegarLoop]: 791 mSDtfsCounter, 3 mSDsluCounter, 1577 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 2368 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:14,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 2368 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:55:14,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-11-19 14:55:14,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 585. [2021-11-19 14:55:14,311 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) [2021-11-19 14:55:14,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 585 states to 585 states and 794 transitions. [2021-11-19 14:55:14,318 INFO L78 Accepts]: Start accepts. Automaton has 585 states and 794 transitions. Word has length 78 [2021-11-19 14:55:14,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:14,321 INFO L470 AbstractCegarLoop]: Abstraction has 585 states and 794 transitions. [2021-11-19 14:55:14,321 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) [2021-11-19 14:55:14,321 INFO L276 IsEmpty]: Start isEmpty. Operand 585 states and 794 transitions. [2021-11-19 14:55:14,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-19 14:55:14,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:14,324 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] [2021-11-19 14:55:14,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:14,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:55:14,539 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:14,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:14,539 INFO L85 PathProgramCache]: Analyzing trace with hash -72101774, now seen corresponding path program 1 times [2021-11-19 14:55:14,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:14,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [707363420] [2021-11-19 14:55:14,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:14,541 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:14,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:14,548 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:14,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-19 14:55:15,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:15,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:15,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:15,771 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:15,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:16,566 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-19 14:55:16,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:16,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [707363420] [2021-11-19 14:55:16,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [707363420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:16,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2018300626] [2021-11-19 14:55:16,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:16,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:16,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:16,574 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:16,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-19 14:55:17,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:17,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:17,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:17,561 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-19 14:55:17,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:17,964 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-19 14:55:17,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2018300626] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:17,964 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:17,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-19 14:55:17,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787228012] [2021-11-19 14:55:17,966 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:17,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:17,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:17,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:17,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:17,971 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) [2021-11-19 14:55:20,083 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:55:21,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:21,907 INFO L93 Difference]: Finished difference Result 2236 states and 3046 transitions. [2021-11-19 14:55:21,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:55:21,908 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 [2021-11-19 14:55:21,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:21,925 INFO L225 Difference]: With dead ends: 2236 [2021-11-19 14:55:21,926 INFO L226 Difference]: Without dead ends: 1670 [2021-11-19 14:55:21,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:21,931 INFO L933 BasicCegarLoop]: 995 mSDtfsCounter, 1510 mSDsluCounter, 2027 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1510 SdHoareTripleChecker+Valid, 3022 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:21,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1510 Valid, 3022 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 230 Invalid, 1 Unknown, 0 Unchecked, 3.8s Time] [2021-11-19 14:55:21,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1670 states. [2021-11-19 14:55:22,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1670 to 1670. [2021-11-19 14:55:22,029 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) [2021-11-19 14:55:22,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 2272 transitions. [2021-11-19 14:55:22,047 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 2272 transitions. Word has length 80 [2021-11-19 14:55:22,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:22,049 INFO L470 AbstractCegarLoop]: Abstraction has 1670 states and 2272 transitions. [2021-11-19 14:55:22,049 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) [2021-11-19 14:55:22,049 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 2272 transitions. [2021-11-19 14:55:22,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-19 14:55:22,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:22,053 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] [2021-11-19 14:55:22,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:22,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:22,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:22,469 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:22,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:22,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1968189157, now seen corresponding path program 1 times [2021-11-19 14:55:22,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:22,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1304077222] [2021-11-19 14:55:22,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:22,471 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:22,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:22,472 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:22,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-19 14:55:23,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:23,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:23,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:23,842 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:23,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:24,587 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:24,587 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:24,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1304077222] [2021-11-19 14:55:24,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1304077222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:24,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1289301813] [2021-11-19 14:55:24,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:24,588 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:24,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:24,598 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:24,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-19 14:55:25,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:25,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:25,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:25,342 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:25,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:25,558 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:25,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1289301813] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:25,559 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:25,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:55:25,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86472903] [2021-11-19 14:55:25,560 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:25,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:55:25,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:25,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:55:25,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:25,563 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) [2021-11-19 14:55:25,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:25,761 INFO L93 Difference]: Finished difference Result 1696 states and 2304 transitions. [2021-11-19 14:55:25,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:25,762 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 [2021-11-19 14:55:25,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:25,779 INFO L225 Difference]: With dead ends: 1696 [2021-11-19 14:55:25,779 INFO L226 Difference]: Without dead ends: 1683 [2021-11-19 14:55:25,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:25,784 INFO L933 BasicCegarLoop]: 808 mSDtfsCounter, 788 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 788 SdHoareTripleChecker+Valid, 824 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:25,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [788 Valid, 824 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:55:25,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1683 states. [2021-11-19 14:55:25,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1683 to 1670. [2021-11-19 14:55:25,926 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) [2021-11-19 14:55:25,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 2271 transitions. [2021-11-19 14:55:25,942 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 2271 transitions. Word has length 100 [2021-11-19 14:55:25,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:25,944 INFO L470 AbstractCegarLoop]: Abstraction has 1670 states and 2271 transitions. [2021-11-19 14:55:25,945 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) [2021-11-19 14:55:25,945 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 2271 transitions. [2021-11-19 14:55:25,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-19 14:55:25,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:25,956 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] [2021-11-19 14:55:25,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:26,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:26,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:55:26,363 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:26,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:26,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1910930855, now seen corresponding path program 1 times [2021-11-19 14:55:26,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:26,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410702879] [2021-11-19 14:55:26,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:26,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:26,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:26,367 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:26,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-19 14:55:26,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:27,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:27,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:27,566 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:27,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:28,354 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:28,354 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:28,355 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410702879] [2021-11-19 14:55:28,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410702879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:28,355 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [89130106] [2021-11-19 14:55:28,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:28,355 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:28,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:28,361 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:28,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-19 14:55:28,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:28,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 14:55:28,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:31,209 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:31,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:31,830 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:31,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [89130106] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:31,830 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:31,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 10 [2021-11-19 14:55:31,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195587989] [2021-11-19 14:55:31,831 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:31,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:31,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:31,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:31,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:31,832 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) [2021-11-19 14:55:32,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:32,379 INFO L93 Difference]: Finished difference Result 4973 states and 6888 transitions. [2021-11-19 14:55:32,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:55:32,380 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 [2021-11-19 14:55:32,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:32,418 INFO L225 Difference]: With dead ends: 4973 [2021-11-19 14:55:32,418 INFO L226 Difference]: Without dead ends: 3322 [2021-11-19 14:55:32,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:32,431 INFO L933 BasicCegarLoop]: 1126 mSDtfsCounter, 776 mSDsluCounter, 1510 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 776 SdHoareTripleChecker+Valid, 2636 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:32,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [776 Valid, 2636 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 14:55:32,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3322 states. [2021-11-19 14:55:32,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3322 to 3310. [2021-11-19 14:55:32,677 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) [2021-11-19 14:55:32,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3310 states to 3310 states and 4549 transitions. [2021-11-19 14:55:32,711 INFO L78 Accepts]: Start accepts. Automaton has 3310 states and 4549 transitions. Word has length 100 [2021-11-19 14:55:32,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:32,712 INFO L470 AbstractCegarLoop]: Abstraction has 3310 states and 4549 transitions. [2021-11-19 14:55:32,713 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) [2021-11-19 14:55:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 3310 states and 4549 transitions. [2021-11-19 14:55:32,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-19 14:55:32,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:32,716 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] [2021-11-19 14:55:32,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:32,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:33,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:55:33,127 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:33,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:33,128 INFO L85 PathProgramCache]: Analyzing trace with hash 890453729, now seen corresponding path program 1 times [2021-11-19 14:55:33,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:33,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1474181270] [2021-11-19 14:55:33,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:33,129 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:33,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:33,133 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:33,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-19 14:55:33,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:33,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:33,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:34,372 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:34,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:35,108 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:35,109 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:35,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1474181270] [2021-11-19 14:55:35,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1474181270] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:35,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [638627337] [2021-11-19 14:55:35,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:35,110 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:35,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:35,116 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:35,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-19 14:55:35,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:35,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 14:55:35,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:37,708 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:37,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:38,374 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:38,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [638627337] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:38,375 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:38,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 10 [2021-11-19 14:55:38,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898845589] [2021-11-19 14:55:38,376 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:38,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:38,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:38,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:38,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:38,378 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) [2021-11-19 14:55:38,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:38,590 INFO L93 Difference]: Finished difference Result 3312 states and 4550 transitions. [2021-11-19 14:55:38,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:38,591 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 [2021-11-19 14:55:38,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:38,622 INFO L225 Difference]: With dead ends: 3312 [2021-11-19 14:55:38,622 INFO L226 Difference]: Without dead ends: 3309 [2021-11-19 14:55:38,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:55:38,627 INFO L933 BasicCegarLoop]: 790 mSDtfsCounter, 751 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 751 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:38,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [751 Valid, 790 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:55:38,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3309 states. [2021-11-19 14:55:38,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3309 to 3309. [2021-11-19 14:55:38,864 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) [2021-11-19 14:55:38,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3309 states to 3309 states and 4547 transitions. [2021-11-19 14:55:38,888 INFO L78 Accepts]: Start accepts. Automaton has 3309 states and 4547 transitions. Word has length 101 [2021-11-19 14:55:38,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:38,890 INFO L470 AbstractCegarLoop]: Abstraction has 3309 states and 4547 transitions. [2021-11-19 14:55:38,890 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) [2021-11-19 14:55:38,890 INFO L276 IsEmpty]: Start isEmpty. Operand 3309 states and 4547 transitions. [2021-11-19 14:55:38,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-19 14:55:38,893 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:38,893 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] [2021-11-19 14:55:38,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:39,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:39,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:39,309 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:39,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:39,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1834034780, now seen corresponding path program 1 times [2021-11-19 14:55:39,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:39,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518851086] [2021-11-19 14:55:39,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:39,311 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:39,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:39,311 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:39,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-19 14:55:39,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:39,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 650 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:39,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:40,448 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:40,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:41,230 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:41,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:41,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518851086] [2021-11-19 14:55:41,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518851086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:41,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1667591017] [2021-11-19 14:55:41,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:41,231 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:41,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:41,234 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:41,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-19 14:55:41,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:41,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 650 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:41,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:42,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:43,216 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:43,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1667591017] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:43,216 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:43,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:55:43,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231923899] [2021-11-19 14:55:43,217 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:43,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:55:43,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:43,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:55:43,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:43,218 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) [2021-11-19 14:55:43,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:43,373 INFO L93 Difference]: Finished difference Result 3311 states and 4548 transitions. [2021-11-19 14:55:43,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:43,374 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 [2021-11-19 14:55:43,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:43,400 INFO L225 Difference]: With dead ends: 3311 [2021-11-19 14:55:43,401 INFO L226 Difference]: Without dead ends: 3308 [2021-11-19 14:55:43,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:43,404 INFO L933 BasicCegarLoop]: 788 mSDtfsCounter, 734 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 734 SdHoareTripleChecker+Valid, 788 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:43,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [734 Valid, 788 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:55:43,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3308 states. [2021-11-19 14:55:43,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3308 to 3308. [2021-11-19 14:55:43,638 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) [2021-11-19 14:55:43,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3308 states to 3308 states and 4545 transitions. [2021-11-19 14:55:43,658 INFO L78 Accepts]: Start accepts. Automaton has 3308 states and 4545 transitions. Word has length 102 [2021-11-19 14:55:43,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:43,658 INFO L470 AbstractCegarLoop]: Abstraction has 3308 states and 4545 transitions. [2021-11-19 14:55:43,659 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) [2021-11-19 14:55:43,659 INFO L276 IsEmpty]: Start isEmpty. Operand 3308 states and 4545 transitions. [2021-11-19 14:55:43,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-19 14:55:43,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:43,662 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] [2021-11-19 14:55:43,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:43,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:44,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:44,078 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:44,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:44,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1020281156, now seen corresponding path program 1 times [2021-11-19 14:55:44,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:44,080 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1011709578] [2021-11-19 14:55:44,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:44,080 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:44,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:44,081 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:44,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-19 14:55:44,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:44,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:44,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:45,216 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:45,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:45,963 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:45,963 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:45,963 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1011709578] [2021-11-19 14:55:45,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1011709578] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:45,964 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [588408011] [2021-11-19 14:55:45,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:45,964 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:45,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:45,965 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:45,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-19 14:55:46,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:46,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:46,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:47,600 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:47,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:48,092 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:48,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [588408011] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:48,093 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:48,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:55:48,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010171181] [2021-11-19 14:55:48,093 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:48,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:55:48,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:48,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:55:48,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:48,095 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) [2021-11-19 14:55:48,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:48,281 INFO L93 Difference]: Finished difference Result 3310 states and 4546 transitions. [2021-11-19 14:55:48,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:48,282 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 [2021-11-19 14:55:48,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:48,315 INFO L225 Difference]: With dead ends: 3310 [2021-11-19 14:55:48,315 INFO L226 Difference]: Without dead ends: 3307 [2021-11-19 14:55:48,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:48,320 INFO L933 BasicCegarLoop]: 786 mSDtfsCounter, 731 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 731 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:48,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [731 Valid, 786 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:55:48,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3307 states. [2021-11-19 14:55:48,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3307 to 3307. [2021-11-19 14:55:48,600 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) [2021-11-19 14:55:48,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3307 states to 3307 states and 4543 transitions. [2021-11-19 14:55:48,630 INFO L78 Accepts]: Start accepts. Automaton has 3307 states and 4543 transitions. Word has length 103 [2021-11-19 14:55:48,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:48,630 INFO L470 AbstractCegarLoop]: Abstraction has 3307 states and 4543 transitions. [2021-11-19 14:55:48,632 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) [2021-11-19 14:55:48,632 INFO L276 IsEmpty]: Start isEmpty. Operand 3307 states and 4543 transitions. [2021-11-19 14:55:48,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-19 14:55:48,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:48,635 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] [2021-11-19 14:55:48,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-19 14:55:48,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:49,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:49,077 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:49,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:49,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1563727455, now seen corresponding path program 1 times [2021-11-19 14:55:49,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:49,079 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [496490381] [2021-11-19 14:55:49,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:49,079 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:49,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:49,080 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:49,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-19 14:55:49,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:49,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:49,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:50,147 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-19 14:55:50,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:50,842 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-19 14:55:50,842 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:50,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [496490381] [2021-11-19 14:55:50,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [496490381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:50,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1317588335] [2021-11-19 14:55:50,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:50,842 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:50,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:50,843 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:50,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-19 14:55:51,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:51,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:51,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:52,196 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:52,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:52,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1317588335] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:52,658 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:52,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:55:52,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454738884] [2021-11-19 14:55:52,658 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:52,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:55:52,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:52,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:55:52,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:52,659 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) [2021-11-19 14:55:52,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:52,825 INFO L93 Difference]: Finished difference Result 3309 states and 4544 transitions. [2021-11-19 14:55:52,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:52,826 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 [2021-11-19 14:55:52,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:52,879 INFO L225 Difference]: With dead ends: 3309 [2021-11-19 14:55:52,880 INFO L226 Difference]: Without dead ends: 3297 [2021-11-19 14:55:52,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:52,885 INFO L933 BasicCegarLoop]: 785 mSDtfsCounter, 728 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 728 SdHoareTripleChecker+Valid, 785 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:52,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [728 Valid, 785 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 14:55:52,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3297 states. [2021-11-19 14:55:53,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3297 to 3297. [2021-11-19 14:55:53,149 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) [2021-11-19 14:55:53,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3297 states to 3297 states and 4530 transitions. [2021-11-19 14:55:53,166 INFO L78 Accepts]: Start accepts. Automaton has 3297 states and 4530 transitions. Word has length 104 [2021-11-19 14:55:53,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:53,167 INFO L470 AbstractCegarLoop]: Abstraction has 3297 states and 4530 transitions. [2021-11-19 14:55:53,167 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) [2021-11-19 14:55:53,167 INFO L276 IsEmpty]: Start isEmpty. Operand 3297 states and 4530 transitions. [2021-11-19 14:55:53,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-19 14:55:53,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:53,177 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] [2021-11-19 14:55:53,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:53,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:53,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:53,602 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:53,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:53,602 INFO L85 PathProgramCache]: Analyzing trace with hash 824528998, now seen corresponding path program 1 times [2021-11-19 14:55:53,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:53,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [880357265] [2021-11-19 14:55:53,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:53,604 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:53,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:53,606 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:53,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-19 14:55:54,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:54,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:55:54,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:54,928 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 50 proven. 1 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-19 14:55:54,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:55,785 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2021-11-19 14:55:55,785 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:55:55,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [880357265] [2021-11-19 14:55:55,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [880357265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:55:55,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [937392562] [2021-11-19 14:55:55,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:55,786 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:55,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:55:55,788 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:55:55,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-19 14:55:56,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:56,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:55:56,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:55:56,851 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-19 14:55:56,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:55:57,360 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-19 14:55:57,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [937392562] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:57,361 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:55:57,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:55:57,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115729351] [2021-11-19 14:55:57,365 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:57,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:55:57,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:55:57,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:55:57,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:57,369 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) [2021-11-19 14:55:58,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:58,144 INFO L93 Difference]: Finished difference Result 9403 states and 12939 transitions. [2021-11-19 14:55:58,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:55:58,144 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 [2021-11-19 14:55:58,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:58,198 INFO L225 Difference]: With dead ends: 9403 [2021-11-19 14:55:58,198 INFO L226 Difference]: Without dead ends: 6125 [2021-11-19 14:55:58,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 553 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:55:58,213 INFO L933 BasicCegarLoop]: 1270 mSDtfsCounter, 673 mSDsluCounter, 721 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 1991 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:58,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [673 Valid, 1991 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 14:55:58,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6125 states. [2021-11-19 14:55:58,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6125 to 6057. [2021-11-19 14:55:58,732 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) [2021-11-19 14:55:58,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6057 states to 6057 states and 8360 transitions. [2021-11-19 14:55:58,762 INFO L78 Accepts]: Start accepts. Automaton has 6057 states and 8360 transitions. Word has length 141 [2021-11-19 14:55:58,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:58,763 INFO L470 AbstractCegarLoop]: Abstraction has 6057 states and 8360 transitions. [2021-11-19 14:55:58,763 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) [2021-11-19 14:55:58,764 INFO L276 IsEmpty]: Start isEmpty. Operand 6057 states and 8360 transitions. [2021-11-19 14:55:58,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-11-19 14:55:58,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:58,777 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] [2021-11-19 14:55:58,807 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-19 14:55:59,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-19 14:55:59,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:55:59,198 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:59,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:59,199 INFO L85 PathProgramCache]: Analyzing trace with hash -414372010, now seen corresponding path program 1 times [2021-11-19 14:55:59,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:55:59,200 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1770583140] [2021-11-19 14:55:59,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:59,200 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:55:59,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:55:59,201 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:55:59,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-19 14:56:00,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:00,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 1177 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:56:00,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:01,309 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-19 14:56:01,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:02,478 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 185 trivial. 0 not checked. [2021-11-19 14:56:02,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:56:02,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1770583140] [2021-11-19 14:56:02,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1770583140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:56:02,479 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1793396389] [2021-11-19 14:56:02,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:02,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:02,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:56:02,481 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:56:02,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-19 14:56:03,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:03,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 1177 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:56:03,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:04,247 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-19 14:56:04,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:05,054 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-19 14:56:05,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1793396389] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:56:05,055 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:56:05,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:56:05,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329396059] [2021-11-19 14:56:05,056 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:56:05,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:56:05,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:56:05,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:56:05,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:56:05,058 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) [2021-11-19 14:56:07,166 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 [] [2021-11-19 14:56:07,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:56:07,779 INFO L93 Difference]: Finished difference Result 16991 states and 23424 transitions. [2021-11-19 14:56:07,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:56:07,780 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 [2021-11-19 14:56:07,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:56:07,846 INFO L225 Difference]: With dead ends: 16991 [2021-11-19 14:56:07,846 INFO L226 Difference]: Without dead ends: 10963 [2021-11-19 14:56:07,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1020 GetRequests, 1013 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:56:07,913 INFO L933 BasicCegarLoop]: 1008 mSDtfsCounter, 633 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 1754 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:56:07,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 1754 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 8 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-19 14:56:07,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10963 states. [2021-11-19 14:56:08,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10963 to 10904. [2021-11-19 14:56:08,791 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) [2021-11-19 14:56:08,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10904 states to 10904 states and 15015 transitions. [2021-11-19 14:56:08,906 INFO L78 Accepts]: Start accepts. Automaton has 10904 states and 15015 transitions. Word has length 256 [2021-11-19 14:56:08,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:56:08,907 INFO L470 AbstractCegarLoop]: Abstraction has 10904 states and 15015 transitions. [2021-11-19 14:56:08,907 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) [2021-11-19 14:56:08,907 INFO L276 IsEmpty]: Start isEmpty. Operand 10904 states and 15015 transitions. [2021-11-19 14:56:08,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-19 14:56:08,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:56:08,922 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] [2021-11-19 14:56:08,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:09,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:09,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:09,344 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:56:09,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:56:09,345 INFO L85 PathProgramCache]: Analyzing trace with hash 698212048, now seen corresponding path program 1 times [2021-11-19 14:56:09,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:56:09,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [612257377] [2021-11-19 14:56:09,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:09,347 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:56:09,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:56:09,348 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:56:09,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-19 14:56:10,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:10,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 1199 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:56:10,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:11,740 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-19 14:56:11,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:13,011 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2021-11-19 14:56:13,011 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:56:13,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [612257377] [2021-11-19 14:56:13,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [612257377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:56:13,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [170680708] [2021-11-19 14:56:13,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:13,012 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:13,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:56:13,016 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:56:13,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-19 14:56:13,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:13,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 1199 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:56:13,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:14,756 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-11-19 14:56:14,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:15,601 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2021-11-19 14:56:15,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [170680708] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:56:15,602 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:56:15,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-19 14:56:15,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852704253] [2021-11-19 14:56:15,602 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:56:15,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 14:56:15,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:56:15,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 14:56:15,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:56:15,605 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) [2021-11-19 14:56:17,619 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 [] [2021-11-19 14:56:19,672 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 [] [2021-11-19 14:56:20,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:56:20,324 INFO L93 Difference]: Finished difference Result 23722 states and 33178 transitions. [2021-11-19 14:56:20,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:56:20,346 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 [2021-11-19 14:56:20,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:56:20,405 INFO L225 Difference]: With dead ends: 23722 [2021-11-19 14:56:20,405 INFO L226 Difference]: Without dead ends: 12847 [2021-11-19 14:56:20,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1056 GetRequests, 1049 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-19 14:56:20,445 INFO L933 BasicCegarLoop]: 945 mSDtfsCounter, 153 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1742 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:56:20,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 1742 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 2 Unknown, 0 Unchecked, 4.1s Time] [2021-11-19 14:56:20,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12847 states. [2021-11-19 14:56:21,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12847 to 11024. [2021-11-19 14:56:21,224 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) [2021-11-19 14:56:21,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11024 states to 11024 states and 15207 transitions. [2021-11-19 14:56:21,267 INFO L78 Accepts]: Start accepts. Automaton has 11024 states and 15207 transitions. Word has length 265 [2021-11-19 14:56:21,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:56:21,268 INFO L470 AbstractCegarLoop]: Abstraction has 11024 states and 15207 transitions. [2021-11-19 14:56:21,268 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) [2021-11-19 14:56:21,268 INFO L276 IsEmpty]: Start isEmpty. Operand 11024 states and 15207 transitions. [2021-11-19 14:56:21,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2021-11-19 14:56:21,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:56:21,283 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] [2021-11-19 14:56:21,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:21,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:21,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:21,696 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:56:21,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:56:21,697 INFO L85 PathProgramCache]: Analyzing trace with hash -998464280, now seen corresponding path program 1 times [2021-11-19 14:56:21,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:56:21,698 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1628395018] [2021-11-19 14:56:21,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:21,698 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:56:21,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:56:21,700 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:56:21,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-19 14:56:22,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:22,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 1213 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:56:22,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:23,782 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-19 14:56:23,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:24,945 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-19 14:56:24,946 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:56:24,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1628395018] [2021-11-19 14:56:24,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1628395018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:56:24,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1009859009] [2021-11-19 14:56:24,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:24,946 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:24,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:56:24,947 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:56:24,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-19 14:56:25,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:25,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 1213 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 14:56:25,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:26,498 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-11-19 14:56:26,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:27,199 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-19 14:56:27,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1009859009] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:56:27,200 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:56:27,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-19 14:56:27,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446093073] [2021-11-19 14:56:27,201 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:56:27,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:56:27,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:56:27,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:56:27,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:56:27,203 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) [2021-11-19 14:56:29,285 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 [] [2021-11-19 14:56:31,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:56:31,597 INFO L93 Difference]: Finished difference Result 28471 states and 39269 transitions. [2021-11-19 14:56:31,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 14:56:31,598 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 [2021-11-19 14:56:31,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:56:31,677 INFO L225 Difference]: With dead ends: 28471 [2021-11-19 14:56:31,677 INFO L226 Difference]: Without dead ends: 17476 [2021-11-19 14:56:31,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1084 GetRequests, 1076 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:56:31,721 INFO L933 BasicCegarLoop]: 1123 mSDtfsCounter, 908 mSDsluCounter, 1392 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 41 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 908 SdHoareTripleChecker+Valid, 2515 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:56:31,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [908 Valid, 2515 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 251 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2021-11-19 14:56:31,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17476 states. [2021-11-19 14:56:32,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17476 to 17238. [2021-11-19 14:56:32,735 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) [2021-11-19 14:56:32,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17238 states to 17238 states and 23662 transitions. [2021-11-19 14:56:32,891 INFO L78 Accepts]: Start accepts. Automaton has 17238 states and 23662 transitions. Word has length 272 [2021-11-19 14:56:32,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:56:32,893 INFO L470 AbstractCegarLoop]: Abstraction has 17238 states and 23662 transitions. [2021-11-19 14:56:32,893 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) [2021-11-19 14:56:32,893 INFO L276 IsEmpty]: Start isEmpty. Operand 17238 states and 23662 transitions. [2021-11-19 14:56:32,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-19 14:56:32,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:56:32,928 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] [2021-11-19 14:56:32,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:33,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:33,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:56:33,335 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:56:33,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:56:33,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1128427979, now seen corresponding path program 1 times [2021-11-19 14:56:33,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:56:33,337 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1464820345] [2021-11-19 14:56:33,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:33,337 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:56:33,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:56:33,339 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:56:33,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-19 14:56:34,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:34,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 1300 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:56:34,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:35,692 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-19 14:56:35,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:37,278 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-19 14:56:37,279 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:56:37,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1464820345] [2021-11-19 14:56:37,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1464820345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:56:37,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1667110242] [2021-11-19 14:56:37,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:37,279 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:37,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:56:37,284 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:56:37,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-19 14:56:38,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:38,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 1300 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 14:56:38,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:38,871 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-19 14:56:38,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:39,535 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-19 14:56:39,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1667110242] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:56:39,535 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:56:39,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-19 14:56:39,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521761746] [2021-11-19 14:56:39,536 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:56:39,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:56:39,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:56:39,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:56:39,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:56:39,538 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) [2021-11-19 14:56:41,615 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:56:43,815 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:56:45,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:56:45,404 INFO L93 Difference]: Finished difference Result 54385 states and 75276 transitions. [2021-11-19 14:56:45,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:56:45,404 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 [2021-11-19 14:56:45,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:56:45,699 INFO L225 Difference]: With dead ends: 54385 [2021-11-19 14:56:45,699 INFO L226 Difference]: Without dead ends: 37180 [2021-11-19 14:56:45,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1234 GetRequests, 1225 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-19 14:56:45,746 INFO L933 BasicCegarLoop]: 938 mSDtfsCounter, 1021 mSDsluCounter, 1694 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 47 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1021 SdHoareTripleChecker+Valid, 2632 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:56:45,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1021 Valid, 2632 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 36 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2021-11-19 14:56:45,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37180 states. [2021-11-19 14:56:47,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37180 to 17250. [2021-11-19 14:56:47,065 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) [2021-11-19 14:56:47,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17250 states to 17250 states and 23674 transitions. [2021-11-19 14:56:47,137 INFO L78 Accepts]: Start accepts. Automaton has 17250 states and 23674 transitions. Word has length 309 [2021-11-19 14:56:47,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:56:47,138 INFO L470 AbstractCegarLoop]: Abstraction has 17250 states and 23674 transitions. [2021-11-19 14:56:47,138 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) [2021-11-19 14:56:47,138 INFO L276 IsEmpty]: Start isEmpty. Operand 17250 states and 23674 transitions. [2021-11-19 14:56:47,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-11-19 14:56:47,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:56:47,161 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] [2021-11-19 14:56:47,169 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-11-19 14:56:47,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:47,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:56:47,588 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:56:47,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:56:47,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1156928269, now seen corresponding path program 1 times [2021-11-19 14:56:47,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:56:47,590 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1147795751] [2021-11-19 14:56:47,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:47,591 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:56:47,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:56:47,593 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:56:47,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-19 14:56:48,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:48,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:56:48,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:50,090 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-19 14:56:50,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:51,420 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-19 14:56:51,420 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:56:51,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1147795751] [2021-11-19 14:56:51,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1147795751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:56:51,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [291613034] [2021-11-19 14:56:51,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:51,421 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:56:51,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:56:51,422 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:56:51,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-19 14:56:52,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:52,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 14:56:52,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:56:52,805 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2021-11-19 14:56:52,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:56:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-19 14:56:53,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [291613034] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:56:53,360 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:56:53,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-19 14:56:53,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488076503] [2021-11-19 14:56:53,361 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:56:53,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:56:53,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:56:53,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:56:53,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:56:53,362 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) [2021-11-19 14:56:55,423 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:56:57,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:56:57,248 INFO L93 Difference]: Finished difference Result 48843 states and 67282 transitions. [2021-11-19 14:56:57,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:56:57,249 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 [2021-11-19 14:56:57,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:56:57,390 INFO L225 Difference]: With dead ends: 48843 [2021-11-19 14:56:57,391 INFO L226 Difference]: Without dead ends: 31626 [2021-11-19 14:56:57,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1234 GetRequests, 1225 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-19 14:56:57,439 INFO L933 BasicCegarLoop]: 1482 mSDtfsCounter, 1053 mSDsluCounter, 2250 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 52 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1053 SdHoareTripleChecker+Valid, 3732 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:56:57,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1053 Valid, 3732 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-19 14:56:57,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31626 states. [2021-11-19 14:56:59,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31626 to 28869. [2021-11-19 14:56:59,134 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) [2021-11-19 14:56:59,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28869 states to 28869 states and 39471 transitions. [2021-11-19 14:56:59,240 INFO L78 Accepts]: Start accepts. Automaton has 28869 states and 39471 transitions. Word has length 309 [2021-11-19 14:56:59,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:56:59,241 INFO L470 AbstractCegarLoop]: Abstraction has 28869 states and 39471 transitions. [2021-11-19 14:56:59,241 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) [2021-11-19 14:56:59,241 INFO L276 IsEmpty]: Start isEmpty. Operand 28869 states and 39471 transitions. [2021-11-19 14:56:59,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2021-11-19 14:56:59,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:56:59,275 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] [2021-11-19 14:56:59,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:59,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-19 14:56:59,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:56:59,688 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:56:59,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:56:59,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1116949080, now seen corresponding path program 1 times [2021-11-19 14:56:59,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:56:59,691 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183334698] [2021-11-19 14:56:59,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:56:59,691 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:56:59,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:56:59,692 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:56:59,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-19 14:57:00,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:00,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 1346 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:57:00,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:01,971 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-19 14:57:01,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:03,265 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-19 14:57:03,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:57:03,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183334698] [2021-11-19 14:57:03,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183334698] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:57:03,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1265510965] [2021-11-19 14:57:03,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:57:03,266 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:03,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:57:03,266 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:57:03,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-19 14:57:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:03,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 1346 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 14:57:03,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:05,312 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 167 trivial. 0 not checked. [2021-11-19 14:57:05,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:06,597 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2021-11-19 14:57:06,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1265510965] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:57:06,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:57:06,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5, 5] total 14 [2021-11-19 14:57:06,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644782740] [2021-11-19 14:57:06,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:57:06,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 14:57:06,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:57:06,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 14:57:06,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:57:06,599 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) [2021-11-19 14:57:08,626 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 [] [2021-11-19 14:57:10,638 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 [] [2021-11-19 14:57:12,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:57:12,192 INFO L93 Difference]: Finished difference Result 57933 states and 79427 transitions. [2021-11-19 14:57:12,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:57:12,198 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 [2021-11-19 14:57:12,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:57:12,548 INFO L225 Difference]: With dead ends: 57933 [2021-11-19 14:57:12,549 INFO L226 Difference]: Without dead ends: 29013 [2021-11-19 14:57:12,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1296 GetRequests, 1284 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:57:12,609 INFO L933 BasicCegarLoop]: 780 mSDtfsCounter, 0 mSDsluCounter, 2334 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 3114 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:57:12,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 3114 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 2 Unknown, 0 Unchecked, 4.1s Time] [2021-11-19 14:57:12,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29013 states. [2021-11-19 14:57:14,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29013 to 28953. [2021-11-19 14:57:14,601 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) [2021-11-19 14:57:14,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28953 states to 28953 states and 39717 transitions. [2021-11-19 14:57:14,681 INFO L78 Accepts]: Start accepts. Automaton has 28953 states and 39717 transitions. Word has length 325 [2021-11-19 14:57:14,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:57:14,682 INFO L470 AbstractCegarLoop]: Abstraction has 28953 states and 39717 transitions. [2021-11-19 14:57:14,682 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) [2021-11-19 14:57:14,682 INFO L276 IsEmpty]: Start isEmpty. Operand 28953 states and 39717 transitions. [2021-11-19 14:57:14,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 332 [2021-11-19 14:57:14,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:57:14,711 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] [2021-11-19 14:57:14,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:14,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:15,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:15,124 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:57:15,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:57:15,125 INFO L85 PathProgramCache]: Analyzing trace with hash 2080184187, now seen corresponding path program 1 times [2021-11-19 14:57:15,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:57:15,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1945516948] [2021-11-19 14:57:15,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:57:15,127 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:57:15,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:57:15,129 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:57:15,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-19 14:57:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:16,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 1361 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:57:16,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:17,517 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2021-11-19 14:57:17,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:18,831 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2021-11-19 14:57:18,831 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:57:18,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1945516948] [2021-11-19 14:57:18,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1945516948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:57:18,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [865090851] [2021-11-19 14:57:18,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:57:18,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:18,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:57:18,833 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:57:18,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-19 14:57:19,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:19,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 1361 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 14:57:19,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:20,919 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2021-11-19 14:57:20,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:21,970 INFO L134 CoverageAnalysis]: Checked inductivity of 277 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-19 14:57:21,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [865090851] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:57:21,970 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:57:21,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-19 14:57:21,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470589822] [2021-11-19 14:57:21,971 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:57:21,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:57:21,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:57:21,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:57:21,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:57:21,973 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) [2021-11-19 14:57:23,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:57:23,559 INFO L93 Difference]: Finished difference Result 63213 states and 87926 transitions. [2021-11-19 14:57:23,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 14:57:23,560 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 [2021-11-19 14:57:23,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:57:23,691 INFO L225 Difference]: With dead ends: 63213 [2021-11-19 14:57:23,691 INFO L226 Difference]: Without dead ends: 34293 [2021-11-19 14:57:23,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1320 GetRequests, 1312 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:57:23,762 INFO L933 BasicCegarLoop]: 933 mSDtfsCounter, 292 mSDsluCounter, 787 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 1720 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 14:57:23,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 1720 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 14:57:23,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34293 states. [2021-11-19 14:57:26,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34293 to 29709. [2021-11-19 14:57:26,077 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) [2021-11-19 14:57:26,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29709 states to 29709 states and 40977 transitions. [2021-11-19 14:57:26,162 INFO L78 Accepts]: Start accepts. Automaton has 29709 states and 40977 transitions. Word has length 331 [2021-11-19 14:57:26,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:57:26,163 INFO L470 AbstractCegarLoop]: Abstraction has 29709 states and 40977 transitions. [2021-11-19 14:57:26,163 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) [2021-11-19 14:57:26,163 INFO L276 IsEmpty]: Start isEmpty. Operand 29709 states and 40977 transitions. [2021-11-19 14:57:26,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2021-11-19 14:57:26,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:57:26,190 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] [2021-11-19 14:57:26,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:26,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:26,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:57:26,595 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:57:26,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:57:26,596 INFO L85 PathProgramCache]: Analyzing trace with hash 155065615, now seen corresponding path program 1 times [2021-11-19 14:57:26,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:57:26,597 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1002371885] [2021-11-19 14:57:26,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:57:26,597 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:57:26,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:57:26,598 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:57:26,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-19 14:57:27,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:27,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:57:27,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:28,872 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 104 proven. 1 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-19 14:57:28,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:30,262 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-19 14:57:30,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:57:30,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1002371885] [2021-11-19 14:57:30,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1002371885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:57:30,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1703107701] [2021-11-19 14:57:30,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:57:30,263 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:30,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:57:30,264 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:57:30,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-19 14:57:30,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:57:30,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-19 14:57:30,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:32,354 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 100 proven. 0 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-11-19 14:57:32,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:33,727 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 24 proven. 4 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-11-19 14:57:33,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1703107701] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:57:33,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:57:33,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 5, 6] total 16 [2021-11-19 14:57:33,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004037037] [2021-11-19 14:57:33,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:57:33,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 14:57:33,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:57:33,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 14:57:33,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-19 14:57:33,729 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) [2021-11-19 14:57:35,741 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 [] [2021-11-19 14:57:37,924 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:57:40,066 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:57:42,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:57:42,622 INFO L93 Difference]: Finished difference Result 70419 states and 99461 transitions. [2021-11-19 14:57:42,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 14:57:42,623 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 [2021-11-19 14:57:42,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:57:42,741 INFO L225 Difference]: With dead ends: 70419 [2021-11-19 14:57:42,741 INFO L226 Difference]: Without dead ends: 40743 [2021-11-19 14:57:42,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1350 GetRequests, 1335 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-19 14:57:42,800 INFO L933 BasicCegarLoop]: 1015 mSDtfsCounter, 443 mSDsluCounter, 3810 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 48 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 468 SdHoareTripleChecker+Valid, 4825 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:57:42,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [468 Valid, 4825 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 6.6s Time] [2021-11-19 14:57:42,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40743 states. [2021-11-19 14:57:44,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40743 to 29835. [2021-11-19 14:57:44,776 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) [2021-11-19 14:57:44,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29835 states to 29835 states and 41103 transitions. [2021-11-19 14:57:44,858 INFO L78 Accepts]: Start accepts. Automaton has 29835 states and 41103 transitions. Word has length 338 [2021-11-19 14:57:44,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:57:44,859 INFO L470 AbstractCegarLoop]: Abstraction has 29835 states and 41103 transitions. [2021-11-19 14:57:44,859 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) [2021-11-19 14:57:44,859 INFO L276 IsEmpty]: Start isEmpty. Operand 29835 states and 41103 transitions. [2021-11-19 14:57:44,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2021-11-19 14:57:44,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:57:44,881 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] [2021-11-19 14:57:44,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:45,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-19 14:57:45,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:45,296 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:57:45,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:57:45,297 INFO L85 PathProgramCache]: Analyzing trace with hash -170556276, now seen corresponding path program 2 times [2021-11-19 14:57:45,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:57:45,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1519449710] [2021-11-19 14:57:45,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 14:57:45,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:57:45,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:57:45,301 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:57:45,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-19 14:57:48,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 14:57:48,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:57:48,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 1391 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:57:48,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:49,548 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 116 proven. 1 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2021-11-19 14:57:49,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:50,906 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2021-11-19 14:57:50,906 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:57:50,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1519449710] [2021-11-19 14:57:50,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1519449710] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:57:50,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1424582561] [2021-11-19 14:57:50,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 14:57:50,906 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:57:50,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:57:50,907 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:57:50,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-19 14:57:53,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 14:57:53,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:57:54,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 1391 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 14:57:54,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:57:55,599 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 102 proven. 0 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2021-11-19 14:57:55,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:57:57,089 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 26 proven. 2 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2021-11-19 14:57:57,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1424582561] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:57:57,090 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:57:57,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 5, 6] total 17 [2021-11-19 14:57:57,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852664458] [2021-11-19 14:57:57,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:57:57,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 14:57:57,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:57:57,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 14:57:57,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-11-19 14:57:57,092 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) [2021-11-19 14:57:59,133 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:58:01,488 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:58:03,648 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 [] [2021-11-19 14:58:06,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:58:06,113 INFO L93 Difference]: Finished difference Result 71217 states and 100595 transitions. [2021-11-19 14:58:06,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 14:58:06,115 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 [2021-11-19 14:58:06,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:58:06,209 INFO L225 Difference]: With dead ends: 71217 [2021-11-19 14:58:06,209 INFO L226 Difference]: Without dead ends: 41415 [2021-11-19 14:58:06,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1377 GetRequests, 1359 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-11-19 14:58:06,248 INFO L933 BasicCegarLoop]: 1026 mSDtfsCounter, 672 mSDsluCounter, 4389 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 127 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 719 SdHoareTripleChecker+Valid, 5415 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:58:06,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [719 Valid, 5415 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 50 Invalid, 3 Unknown, 0 Unchecked, 6.6s Time] [2021-11-19 14:58:06,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41415 states. [2021-11-19 14:58:08,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41415 to 29961. [2021-11-19 14:58:08,159 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) [2021-11-19 14:58:08,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29961 states to 29961 states and 41229 transitions. [2021-11-19 14:58:08,236 INFO L78 Accepts]: Start accepts. Automaton has 29961 states and 41229 transitions. Word has length 344 [2021-11-19 14:58:08,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:58:08,237 INFO L470 AbstractCegarLoop]: Abstraction has 29961 states and 41229 transitions. [2021-11-19 14:58:08,237 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) [2021-11-19 14:58:08,237 INFO L276 IsEmpty]: Start isEmpty. Operand 29961 states and 41229 transitions. [2021-11-19 14:58:08,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-19 14:58:08,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:58:08,249 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] [2021-11-19 14:58:08,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:08,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:08,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:58:08,650 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:58:08,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:58:08,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1082303095, now seen corresponding path program 3 times [2021-11-19 14:58:08,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:58:08,652 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [358001022] [2021-11-19 14:58:08,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 14:58:08,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:58:08,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:58:08,653 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:58:08,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-19 14:58:11,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-19 14:58:11,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 14:58:11,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 740 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 14:58:11,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:12,150 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2021-11-19 14:58:12,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:13,586 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2021-11-19 14:58:13,586 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:58:13,587 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [358001022] [2021-11-19 14:58:13,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [358001022] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:58:13,587 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:58:13,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2021-11-19 14:58:13,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120025176] [2021-11-19 14:58:13,588 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:58:13,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-19 14:58:13,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:58:13,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-19 14:58:13,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-19 14:58:13,590 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) [2021-11-19 14:58:16,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:58:16,561 INFO L93 Difference]: Finished difference Result 60609 states and 83471 transitions. [2021-11-19 14:58:16,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 14:58:16,562 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 [2021-11-19 14:58:16,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:58:16,649 INFO L225 Difference]: With dead ends: 60609 [2021-11-19 14:58:16,649 INFO L226 Difference]: Without dead ends: 30681 [2021-11-19 14:58:16,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 703 GetRequests, 691 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:58:16,692 INFO L933 BasicCegarLoop]: 1097 mSDtfsCounter, 1344 mSDsluCounter, 6227 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1350 SdHoareTripleChecker+Valid, 7324 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-19 14:58:16,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1350 Valid, 7324 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-19 14:58:16,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30681 states. [2021-11-19 14:58:18,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30681 to 30411. [2021-11-19 14:58:18,454 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) [2021-11-19 14:58:18,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30411 states to 30411 states and 41889 transitions. [2021-11-19 14:58:18,532 INFO L78 Accepts]: Start accepts. Automaton has 30411 states and 41889 transitions. Word has length 350 [2021-11-19 14:58:18,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:58:18,533 INFO L470 AbstractCegarLoop]: Abstraction has 30411 states and 41889 transitions. [2021-11-19 14:58:18,533 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) [2021-11-19 14:58:18,533 INFO L276 IsEmpty]: Start isEmpty. Operand 30411 states and 41889 transitions. [2021-11-19 14:58:18,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2021-11-19 14:58:18,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:58:18,546 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] [2021-11-19 14:58:18,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:18,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:58:18,747 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:58:18,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:58:18,747 INFO L85 PathProgramCache]: Analyzing trace with hash -2098266106, now seen corresponding path program 1 times [2021-11-19 14:58:18,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:58:18,748 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [790222777] [2021-11-19 14:58:18,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:18,748 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:58:18,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:58:18,749 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:58:18,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-19 14:58:19,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:19,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 1421 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:58:19,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:21,080 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 239 trivial. 0 not checked. [2021-11-19 14:58:21,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:22,440 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2021-11-19 14:58:22,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:58:22,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [790222777] [2021-11-19 14:58:22,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [790222777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:58:22,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1704267618] [2021-11-19 14:58:22,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:22,441 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:58:22,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:58:22,442 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:58:22,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-19 14:58:23,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:23,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 1421 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 14:58:23,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:24,091 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-19 14:58:24,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:24,936 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-19 14:58:24,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1704267618] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:58:24,937 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:58:24,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-19 14:58:24,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330538193] [2021-11-19 14:58:24,937 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:58:24,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 14:58:24,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:58:24,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 14:58:24,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-19 14:58:24,939 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) [2021-11-19 14:58:26,990 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:58:34,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:58:34,881 INFO L93 Difference]: Finished difference Result 85269 states and 122216 transitions. [2021-11-19 14:58:34,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 14:58:34,882 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 [2021-11-19 14:58:34,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:58:35,026 INFO L225 Difference]: With dead ends: 85269 [2021-11-19 14:58:35,026 INFO L226 Difference]: Without dead ends: 54891 [2021-11-19 14:58:35,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1430 GetRequests, 1413 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-19 14:58:35,072 INFO L933 BasicCegarLoop]: 1753 mSDtfsCounter, 1937 mSDsluCounter, 8127 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 268 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2013 SdHoareTripleChecker+Valid, 9880 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-19 14:58:35,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2013 Valid, 9880 Invalid, 701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 432 Invalid, 1 Unknown, 0 Unchecked, 5.6s Time] [2021-11-19 14:58:35,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54891 states. [2021-11-19 14:58:37,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54891 to 30411. [2021-11-19 14:58:37,529 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) [2021-11-19 14:58:37,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30411 states to 30411 states and 41883 transitions. [2021-11-19 14:58:37,609 INFO L78 Accepts]: Start accepts. Automaton has 30411 states and 41883 transitions. Word has length 356 [2021-11-19 14:58:37,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:58:37,610 INFO L470 AbstractCegarLoop]: Abstraction has 30411 states and 41883 transitions. [2021-11-19 14:58:37,610 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) [2021-11-19 14:58:37,610 INFO L276 IsEmpty]: Start isEmpty. Operand 30411 states and 41883 transitions. [2021-11-19 14:58:37,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2021-11-19 14:58:37,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:58:37,622 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] [2021-11-19 14:58:37,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-19 14:58:37,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:38,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 14:58:38,023 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:58:38,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:58:38,024 INFO L85 PathProgramCache]: Analyzing trace with hash -2064067786, now seen corresponding path program 1 times [2021-11-19 14:58:38,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:58:38,025 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [661012810] [2021-11-19 14:58:38,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:38,025 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:58:38,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:58:38,026 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:58:38,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-19 14:58:38,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:38,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 1427 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:58:39,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:40,522 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-19 14:58:40,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:41,832 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-19 14:58:41,832 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:58:41,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [661012810] [2021-11-19 14:58:41,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [661012810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:58:41,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1094502878] [2021-11-19 14:58:41,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:41,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:58:41,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:58:41,833 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:58:41,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-19 14:58:42,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:42,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 1427 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 14:58:42,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:43,706 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-11-19 14:58:43,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:45,737 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 17 proven. 2 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-19 14:58:45,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1094502878] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-19 14:58:45,738 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-19 14:58:45,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 5, 9] total 18 [2021-11-19 14:58:45,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861665734] [2021-11-19 14:58:45,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:58:45,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 14:58:45,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:58:45,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 14:58:45,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-11-19 14:58:45,739 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) [2021-11-19 14:58:48,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:58:48,681 INFO L93 Difference]: Finished difference Result 61389 states and 84743 transitions. [2021-11-19 14:58:48,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 14:58:48,682 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 [2021-11-19 14:58:48,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:58:48,756 INFO L225 Difference]: With dead ends: 61389 [2021-11-19 14:58:48,756 INFO L226 Difference]: Without dead ends: 31011 [2021-11-19 14:58:48,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1444 GetRequests, 1423 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-11-19 14:58:48,806 INFO L933 BasicCegarLoop]: 776 mSDtfsCounter, 16 mSDsluCounter, 4614 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 5390 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:58:48,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 5390 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 14:58:48,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31011 states. [2021-11-19 14:58:51,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31011 to 30591. [2021-11-19 14:58:51,062 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) [2021-11-19 14:58:51,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30591 states to 30591 states and 42123 transitions. [2021-11-19 14:58:51,138 INFO L78 Accepts]: Start accepts. Automaton has 30591 states and 42123 transitions. Word has length 361 [2021-11-19 14:58:51,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:58:51,138 INFO L470 AbstractCegarLoop]: Abstraction has 30591 states and 42123 transitions. [2021-11-19 14:58:51,138 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) [2021-11-19 14:58:51,138 INFO L276 IsEmpty]: Start isEmpty. Operand 30591 states and 42123 transitions. [2021-11-19 14:58:51,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-19 14:58:51,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:58:51,156 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] [2021-11-19 14:58:51,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:51,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-19 14:58:51,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:58:51,562 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:58:51,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:58:51,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1280359052, now seen corresponding path program 1 times [2021-11-19 14:58:51,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:58:51,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1398888267] [2021-11-19 14:58:51,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:51,564 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:58:51,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:58:51,565 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:58:51,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-19 14:58:52,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:52,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:58:52,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:53,983 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-19 14:58:53,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:55,538 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-19 14:58:55,539 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:58:55,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1398888267] [2021-11-19 14:58:55,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1398888267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:58:55,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [891149771] [2021-11-19 14:58:55,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:58:55,539 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:58:55,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:58:55,540 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:58:55,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-19 14:58:56,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:58:56,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 1434 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 14:58:56,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:58:57,384 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2021-11-19 14:58:57,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:58:58,374 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2021-11-19 14:58:58,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [891149771] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:58:58,374 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:58:58,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-19 14:58:58,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167061575] [2021-11-19 14:58:58,375 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:58:58,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 14:58:58,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:58:58,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 14:58:58,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-19 14:58:58,377 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) [2021-11-19 14:59:00,430 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:59:08,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:59:08,561 INFO L93 Difference]: Finished difference Result 83221 states and 118575 transitions. [2021-11-19 14:59:08,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 14:59:08,563 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 [2021-11-19 14:59:08,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:59:08,697 INFO L225 Difference]: With dead ends: 83221 [2021-11-19 14:59:08,697 INFO L226 Difference]: Without dead ends: 52663 [2021-11-19 14:59:08,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1437 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-11-19 14:59:08,867 INFO L933 BasicCegarLoop]: 1459 mSDtfsCounter, 2595 mSDsluCounter, 7122 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 336 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2674 SdHoareTripleChecker+Valid, 8581 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-19 14:59:08,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2674 Valid, 8581 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 450 Invalid, 1 Unknown, 0 Unchecked, 5.8s Time] [2021-11-19 14:59:08,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52663 states. [2021-11-19 14:59:11,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52663 to 30555. [2021-11-19 14:59:11,043 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) [2021-11-19 14:59:11,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30555 states to 30555 states and 42015 transitions. [2021-11-19 14:59:11,123 INFO L78 Accepts]: Start accepts. Automaton has 30555 states and 42015 transitions. Word has length 362 [2021-11-19 14:59:11,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:59:11,123 INFO L470 AbstractCegarLoop]: Abstraction has 30555 states and 42015 transitions. [2021-11-19 14:59:11,123 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) [2021-11-19 14:59:11,123 INFO L276 IsEmpty]: Start isEmpty. Operand 30555 states and 42015 transitions. [2021-11-19 14:59:11,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2021-11-19 14:59:11,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:59:11,144 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] [2021-11-19 14:59:11,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-19 14:59:11,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-19 14:59:11,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 14:59:11,550 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:59:11,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:59:11,551 INFO L85 PathProgramCache]: Analyzing trace with hash -1771637586, now seen corresponding path program 1 times [2021-11-19 14:59:11,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 14:59:11,552 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1680326587] [2021-11-19 14:59:11,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:59:11,552 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 14:59:11,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 14:59:11,554 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 14:59:11,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-19 14:59:12,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:59:12,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 1528 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 14:59:12,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:59:14,066 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 140 proven. 1 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-19 14:59:14,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:59:15,437 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 359 trivial. 0 not checked. [2021-11-19 14:59:15,437 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 14:59:15,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1680326587] [2021-11-19 14:59:15,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1680326587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 14:59:15,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1855044561] [2021-11-19 14:59:15,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:59:15,438 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 14:59:15,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 14:59:15,438 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 14:59:15,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2de5ab29-11be-4f10-b3a8-8105817d8a10/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-19 14:59:16,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:59:16,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 1528 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 14:59:16,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 14:59:16,900 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-19 14:59:16,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 14:59:17,998 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2021-11-19 14:59:17,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1855044561] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 14:59:17,998 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 14:59:17,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-19 14:59:17,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558618389] [2021-11-19 14:59:17,999 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 14:59:17,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 14:59:17,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 14:59:18,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 14:59:18,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-19 14:59:18,000 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)