./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 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/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_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8 --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-47ea020 [2021-11-07 02:04:11,536 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:04:11,538 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:04:11,592 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:04:11,593 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:04:11,598 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:04:11,600 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:04:11,604 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:04:11,608 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:04:11,616 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:04:11,618 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:04:11,620 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:04:11,620 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:04:11,624 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:04:11,627 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:04:11,634 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:04:11,636 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:04:11,637 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:04:11,640 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:04:11,651 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:04:11,654 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:04:11,655 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:04:11,659 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:04:11,660 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:04:11,671 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:04:11,671 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:04:11,672 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:04:11,675 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:04:11,675 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:04:11,677 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:04:11,677 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:04:11,679 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:04:11,681 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:04:11,682 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:04:11,684 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:04:11,684 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:04:11,685 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:04:11,686 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:04:11,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:04:11,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:04:11,688 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:04:11,689 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-07 02:04:11,741 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:04:11,742 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:04:11,743 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:04:11,743 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:04:11,743 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:04:11,744 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:04:11,744 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:04:11,744 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:04:11,744 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:04:11,745 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:04:11,745 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:04:11,745 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:04:11,746 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:04:11,746 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:04:11,746 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:04:11,747 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:04:11,747 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:04:11,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:04:11,748 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:04:11,748 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:04:11,748 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:04:11,748 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:04:11,749 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:04:11,749 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:04:11,749 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:04:11,750 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:04:11,750 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:04:11,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:11,750 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:04:11,751 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:04:11,751 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:04:11,751 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:04:11,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:04:11,752 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:04:11,752 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:04:11,752 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:04:11,753 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_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-07 02:04:12,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:04:12,094 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:04:12,097 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:04:12,099 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:04:12,100 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:04:12,101 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/../../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 [2021-11-07 02:04:12,168 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/9fbfb6b9c/bfc3ea960af44c8a9d11efb9a60e6656/FLAGf2f044128 [2021-11-07 02:04:13,210 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:04:13,212 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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 [2021-11-07 02:04:13,265 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/9fbfb6b9c/bfc3ea960af44c8a9d11efb9a60e6656/FLAGf2f044128 [2021-11-07 02:04:13,547 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/9fbfb6b9c/bfc3ea960af44c8a9d11efb9a60e6656 [2021-11-07 02:04:13,549 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:04:13,551 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:04:13,555 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:13,556 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:04:13,559 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:04:13,561 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:13" (1/1) ... [2021-11-07 02:04:13,562 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d7c2d84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:13, skipping insertion in model container [2021-11-07 02:04:13,562 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:13" (1/1) ... [2021-11-07 02:04:13,570 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:04:13,688 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:15,016 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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] [2021-11-07 02:04:15,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:15,138 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) [2021-11-07 02:04:15,139 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@6972582d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:15, skipping insertion in model container [2021-11-07 02:04:15,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:15,139 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:04:15,142 INFO L168 Benchmark]: Toolchain (without parser) took 1589.01 ms. Allocated memory is still 96.5 MB. Free memory was 65.8 MB in the beginning and 41.0 MB in the end (delta: 24.8 MB). Peak memory consumption was 43.2 MB. Max. memory is 16.1 GB. [2021-11-07 02:04:15,143 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 79.7 MB. Free memory was 54.0 MB in the beginning and 53.9 MB in the end (delta: 36.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:04:15,144 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1584.58 ms. Allocated memory is still 96.5 MB. Free memory was 65.5 MB in the beginning and 41.0 MB in the end (delta: 24.5 MB). Peak memory consumption was 43.2 MB. Max. memory is 16.1 GB. [2021-11-07 02:04:15,146 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 79.7 MB. Free memory was 54.0 MB in the beginning and 53.9 MB in the end (delta: 36.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 1584.58 ms. Allocated memory is still 96.5 MB. Free memory was 65.5 MB in the beginning and 41.0 MB in the end (delta: 24.5 MB). Peak memory consumption was 43.2 MB. Max. memory is 16.1 GB. * 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_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/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_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8 --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-47ea020 [2021-11-07 02:04:17,721 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:04:17,725 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:04:17,794 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:04:17,795 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:04:17,801 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:04:17,804 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:04:17,809 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:04:17,813 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:04:17,823 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:04:17,825 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:04:17,828 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:04:17,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:04:17,832 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:04:17,835 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:04:17,840 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:04:17,843 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:04:17,845 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:04:17,847 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:04:17,858 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:04:17,860 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:04:17,862 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:04:17,866 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:04:17,869 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:04:17,880 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:04:17,881 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:04:17,881 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:04:17,884 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:04:17,885 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:04:17,886 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:04:17,887 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:04:17,888 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:04:17,891 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:04:17,892 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:04:17,894 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:04:17,894 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:04:17,895 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:04:17,896 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:04:17,896 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:04:17,898 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:04:17,899 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:04:17,906 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-07 02:04:17,960 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:04:17,961 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:04:17,963 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:04:17,963 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:04:17,963 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:04:17,964 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:04:17,964 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:04:17,964 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:04:17,965 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:04:17,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:04:17,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:04:17,968 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:04:17,969 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:04:17,969 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:04:17,969 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:04:17,969 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:04:17,970 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:04:17,970 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:04:17,970 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:04:17,971 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:04:17,971 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:04:17,971 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:04:17,972 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:04:17,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:17,972 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:04:17,973 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:04:17,973 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:04:17,973 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:04:17,974 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:17,974 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:04:17,974 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:04:17,974 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:04:17,975 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_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f21bcf4203715ff2cf8f1fa847025b0ca29b6eb32fc30a64baf7cbf3cb00ebc [2021-11-07 02:04:18,466 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:04:18,488 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:04:18,492 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:04:18,493 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:04:18,494 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:04:18,495 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/../../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 [2021-11-07 02:04:18,566 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/53c31d4aa/00c7ec5df700421bbadced1ca7d7feb7/FLAGa207a6bbd [2021-11-07 02:04:19,577 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:04:19,578 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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 [2021-11-07 02:04:19,632 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/53c31d4aa/00c7ec5df700421bbadced1ca7d7feb7/FLAGa207a6bbd [2021-11-07 02:04:19,968 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/data/53c31d4aa/00c7ec5df700421bbadced1ca7d7feb7 [2021-11-07 02:04:19,970 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:04:19,972 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:04:19,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:19,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:04:19,980 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:04:19,981 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:19" (1/1) ... [2021-11-07 02:04:19,982 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a6c0264 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:19, skipping insertion in model container [2021-11-07 02:04:19,983 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:19" (1/1) ... [2021-11-07 02:04:19,992 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:04:20,172 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:21,475 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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] [2021-11-07 02:04:21,543 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:21,600 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:04:21,685 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:04:22,059 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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] [2021-11-07 02:04:22,091 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:22,121 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:04:22,598 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/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] [2021-11-07 02:04:22,627 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:04:22,884 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:04:22,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22 WrapperNode [2021-11-07 02:04:22,885 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:04:22,887 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:04:22,887 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:04:22,888 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:04:22,896 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:22,998 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,165 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:04:23,166 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:04:23,167 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:04:23,167 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:04:23,185 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,215 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,215 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,358 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,401 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,430 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,462 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:04:23,465 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:04:23,465 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:04:23,465 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:04:23,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (1/1) ... [2021-11-07 02:04:23,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:04:23,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:04:23,504 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:04:23,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:04:23,555 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-07 02:04:23,555 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_usb_submit_urb_8 [2021-11-07 02:04:23,555 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_usb_submit_urb_8 [2021-11-07 02:04:23,555 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_submit_urb [2021-11-07 02:04:23,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_submit_urb [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_size_call_parameter [2021-11-07 02:04:23,556 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure rx_submit [2021-11-07 02:04:23,557 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_submit [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-07 02:04:23,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure __bad_percpu_size [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE8 [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE2 [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2021-11-07 02:04:23,558 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-07 02:04:23,558 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-07 02:04:23,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:04:23,560 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-07 02:04:23,560 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-07 02:04:23,560 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-07 02:04:23,560 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:04:23,560 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:04:23,561 INFO L130 BoogieDeclarations]: Found specification of procedure rx_complete [2021-11-07 02:04:23,561 INFO L138 BoogieDeclarations]: Found implementation of procedure rx_complete [2021-11-07 02:04:48,979 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:04:48,979 INFO L299 CfgBuilder]: Removed 477 assume(true) statements. [2021-11-07 02:04:48,982 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:04:48 BoogieIcfgContainer [2021-11-07 02:04:48,983 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:04:48,985 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:04:48,985 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:04:48,989 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:04:48,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:04:19" (1/3) ... [2021-11-07 02:04:48,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fd8c969 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:04:48, skipping insertion in model container [2021-11-07 02:04:48,990 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:22" (2/3) ... [2021-11-07 02:04:48,991 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fd8c969 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:04:48, skipping insertion in model container [2021-11-07 02:04:48,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:04:48" (3/3) ... [2021-11-07 02:04:48,993 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 [2021-11-07 02:04:48,999 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:04:48,999 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2021-11-07 02:04:49,054 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:04:49,061 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 [2021-11-07 02:04:49,061 INFO L340 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-11-07 02:04:49,096 INFO L276 IsEmpty]: Start isEmpty. Operand has 500 states, 481 states have (on average 1.4282744282744282) internal successors, (687), 487 states have internal predecessors, (687), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-07 02:04:49,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-07 02:04:49,103 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:49,104 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:49,104 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:04:49,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:49,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1490593226, now seen corresponding path program 1 times [2021-11-07 02:04:49,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:49,123 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1099372078] [2021-11-07 02:04:49,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:49,124 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:49,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:49,131 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:49,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:04:49,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:49,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 02:04:49,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:50,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:50,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:50,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:50,282 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:50,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1099372078] [2021-11-07 02:04:50,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1099372078] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:50,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:50,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:04:50,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139597473] [2021-11-07 02:04:50,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 02:04:50,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:50,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 02:04:50,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:04:50,313 INFO L87 Difference]: Start difference. First operand has 500 states, 481 states have (on average 1.4282744282744282) internal successors, (687), 487 states have internal predecessors, (687), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 2 states, 2 states have (on average 15.5) internal successors, (31), 2 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:50,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:50,418 INFO L93 Difference]: Finished difference Result 996 states and 1409 transitions. [2021-11-07 02:04:50,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:04:50,419 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 15.5) internal successors, (31), 2 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-07 02:04:50,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:50,451 INFO L225 Difference]: With dead ends: 996 [2021-11-07 02:04:50,451 INFO L226 Difference]: Without dead ends: 489 [2021-11-07 02:04:50,459 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:04:50,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-11-07 02:04:50,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 489. [2021-11-07 02:04:50,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 471 states have (on average 1.3821656050955413) internal successors, (651), 476 states have internal predecessors, (651), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-07 02:04:50,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 667 transitions. [2021-11-07 02:04:50,536 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 667 transitions. Word has length 31 [2021-11-07 02:04:50,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:50,537 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 667 transitions. [2021-11-07 02:04:50,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 15.5) internal successors, (31), 2 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:50,537 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 667 transitions. [2021-11-07 02:04:50,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-07 02:04:50,539 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:50,539 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:50,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:50,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:50,755 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:04:50,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:50,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1477252530, now seen corresponding path program 1 times [2021-11-07 02:04:50,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:50,758 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1017233324] [2021-11-07 02:04:50,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:50,758 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:50,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:50,759 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:50,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:04:51,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:51,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:04:51,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:51,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:51,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:51,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:04:51,901 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:51,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1017233324] [2021-11-07 02:04:51,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1017233324] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:51,903 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:51,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:04:51,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526996727] [2021-11-07 02:04:51,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:51,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:51,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:51,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:51,913 INFO L87 Difference]: Start difference. First operand 489 states and 667 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:52,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:52,053 INFO L93 Difference]: Finished difference Result 966 states and 1325 transitions. [2021-11-07 02:04:52,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:52,054 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-07 02:04:52,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:52,060 INFO L225 Difference]: With dead ends: 966 [2021-11-07 02:04:52,061 INFO L226 Difference]: Without dead ends: 493 [2021-11-07 02:04:52,064 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:52,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-07 02:04:52,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 493. [2021-11-07 02:04:52,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 475 states have (on average 1.3789473684210527) internal successors, (655), 480 states have internal predecessors, (655), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-07 02:04:52,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 671 transitions. [2021-11-07 02:04:52,096 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 671 transitions. Word has length 31 [2021-11-07 02:04:52,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:52,096 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 671 transitions. [2021-11-07 02:04:52,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:52,097 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 671 transitions. [2021-11-07 02:04:52,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-07 02:04:52,099 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:52,099 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:52,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:52,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:52,315 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:04:52,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:52,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1595349454, now seen corresponding path program 1 times [2021-11-07 02:04:52,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:52,318 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [97295126] [2021-11-07 02:04:52,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:52,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:52,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:52,322 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:52,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:04:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:53,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:04:53,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:53,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:04:53,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:53,854 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:04:53,854 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:53,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [97295126] [2021-11-07 02:04:53,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [97295126] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:04:53,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1750472449] [2021-11-07 02:04:53,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:53,855 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:53,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:04:53,859 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:04:53,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-07 02:04:54,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:54,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:04:54,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:54,805 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:04:54,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:54,971 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:04:54,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1750472449] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:54,972 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:04:54,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-07 02:04:54,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609288639] [2021-11-07 02:04:54,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:54,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:54,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:54,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:04:54,974 INFO L87 Difference]: Start difference. First operand 493 states and 671 transitions. Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:57,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:57,433 INFO L93 Difference]: Finished difference Result 1844 states and 2549 transitions. [2021-11-07 02:04:57,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:57,435 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-07 02:04:57,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:57,448 INFO L225 Difference]: With dead ends: 1844 [2021-11-07 02:04:57,448 INFO L226 Difference]: Without dead ends: 1376 [2021-11-07 02:04:57,451 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:04:57,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1376 states. [2021-11-07 02:04:57,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1376 to 1376. [2021-11-07 02:04:57,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1332 states have (on average 1.3911411411411412) internal successors, (1853), 1339 states have internal predecessors, (1853), 24 states have call successors, (24), 15 states have call predecessors, (24), 15 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-07 02:04:57,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 1901 transitions. [2021-11-07 02:04:57,556 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 1901 transitions. Word has length 35 [2021-11-07 02:04:57,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:57,556 INFO L470 AbstractCegarLoop]: Abstraction has 1376 states and 1901 transitions. [2021-11-07 02:04:57,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:57,557 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 1901 transitions. [2021-11-07 02:04:57,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 02:04:57,567 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:57,567 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:57,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-07 02:04:57,787 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-11-07 02:04:57,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:57,968 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:04:57,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:57,969 INFO L85 PathProgramCache]: Analyzing trace with hash 782536233, now seen corresponding path program 1 times [2021-11-07 02:04:57,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:57,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [555465321] [2021-11-07 02:04:57,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:57,970 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:57,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:57,983 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:57,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:04:58,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:58,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:04:58,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:59,092 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:04:59,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:59,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:04:59,562 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:59,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [555465321] [2021-11-07 02:04:59,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [555465321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:04:59,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [487437885] [2021-11-07 02:04:59,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:59,563 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:59,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:04:59,566 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:04:59,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-07 02:05:00,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:00,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:00,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:00,483 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:00,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:00,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:00,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [487437885] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:00,576 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:00,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:00,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034161650] [2021-11-07 02:05:00,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:00,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:00,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:00,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:00,578 INFO L87 Difference]: Start difference. First operand 1376 states and 1901 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:00,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:00,768 INFO L93 Difference]: Finished difference Result 1406 states and 1929 transitions. [2021-11-07 02:05:00,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:00,769 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-07 02:05:00,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:00,781 INFO L225 Difference]: With dead ends: 1406 [2021-11-07 02:05:00,782 INFO L226 Difference]: Without dead ends: 1391 [2021-11-07 02:05:00,783 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:00,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1391 states. [2021-11-07 02:05:00,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1391 to 1376. [2021-11-07 02:05:00,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1376 states, 1332 states have (on average 1.3903903903903905) internal successors, (1852), 1339 states have internal predecessors, (1852), 24 states have call successors, (24), 15 states have call predecessors, (24), 15 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-07 02:05:00,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1376 states to 1376 states and 1900 transitions. [2021-11-07 02:05:00,870 INFO L78 Accepts]: Start accepts. Automaton has 1376 states and 1900 transitions. Word has length 44 [2021-11-07 02:05:00,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:00,870 INFO L470 AbstractCegarLoop]: Abstraction has 1376 states and 1900 transitions. [2021-11-07 02:05:00,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:00,871 INFO L276 IsEmpty]: Start isEmpty. Operand 1376 states and 1900 transitions. [2021-11-07 02:05:00,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 02:05:00,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:00,872 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:00,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:01,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:01,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:01,294 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:01,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:01,295 INFO L85 PathProgramCache]: Analyzing trace with hash 782595815, now seen corresponding path program 1 times [2021-11-07 02:05:01,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:01,296 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1744823385] [2021-11-07 02:05:01,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:01,296 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:01,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:01,297 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:01,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:05:01,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:01,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:01,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:02,319 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:02,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:02,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:02,810 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:02,810 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1744823385] [2021-11-07 02:05:02,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1744823385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:02,811 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [307411818] [2021-11-07 02:05:02,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:02,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:02,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:02,812 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:02,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-07 02:05:03,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:03,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:05:03,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:04,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:05,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:05,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [307411818] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:05,057 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:05,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 10 [2021-11-07 02:05:05,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261812188] [2021-11-07 02:05:05,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:05:05,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:05,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:05:05,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:05,060 INFO L87 Difference]: Start difference. First operand 1376 states and 1900 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:05,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:05,626 INFO L93 Difference]: Finished difference Result 4076 states and 5717 transitions. [2021-11-07 02:05:05,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:05:05,628 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-07 02:05:05,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:05,656 INFO L225 Difference]: With dead ends: 4076 [2021-11-07 02:05:05,657 INFO L226 Difference]: Without dead ends: 2725 [2021-11-07 02:05:05,663 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:05,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2725 states. [2021-11-07 02:05:05,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2725 to 2713. [2021-11-07 02:05:05,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2713 states, 2630 states have (on average 1.3874524714828897) internal successors, (3649), 2640 states have internal predecessors, (3649), 48 states have call successors, (48), 30 states have call predecessors, (48), 30 states have return successors, (72), 48 states have call predecessors, (72), 48 states have call successors, (72) [2021-11-07 02:05:05,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2713 states to 2713 states and 3769 transitions. [2021-11-07 02:05:05,875 INFO L78 Accepts]: Start accepts. Automaton has 2713 states and 3769 transitions. Word has length 44 [2021-11-07 02:05:05,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:05,876 INFO L470 AbstractCegarLoop]: Abstraction has 2713 states and 3769 transitions. [2021-11-07 02:05:05,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 3 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:05,877 INFO L276 IsEmpty]: Start isEmpty. Operand 2713 states and 3769 transitions. [2021-11-07 02:05:05,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 02:05:05,878 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:05,878 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:05,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-11-07 02:05:06,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:06,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:06,285 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:06,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:06,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1509326079, now seen corresponding path program 1 times [2021-11-07 02:05:06,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:06,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [400711765] [2021-11-07 02:05:06,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:06,287 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:06,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:06,288 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:06,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:05:07,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:07,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:07,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:07,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:07,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:07,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:07,750 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:07,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [400711765] [2021-11-07 02:05:07,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [400711765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:07,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1322128484] [2021-11-07 02:05:07,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:07,751 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:07,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:07,756 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:07,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-07 02:05:08,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:08,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:05:08,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:09,396 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:09,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:09,965 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:09,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1322128484] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:09,965 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:09,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 10 [2021-11-07 02:05:09,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829276388] [2021-11-07 02:05:09,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:05:09,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:09,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:05:09,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:09,968 INFO L87 Difference]: Start difference. First operand 2713 states and 3769 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:10,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:10,099 INFO L93 Difference]: Finished difference Result 2713 states and 3769 transitions. [2021-11-07 02:05:10,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:10,100 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 02:05:10,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:10,119 INFO L225 Difference]: With dead ends: 2713 [2021-11-07 02:05:10,119 INFO L226 Difference]: Without dead ends: 2711 [2021-11-07 02:05:10,121 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:10,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2711 states. [2021-11-07 02:05:10,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2711 to 2711. [2021-11-07 02:05:10,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2711 states, 2629 states have (on average 1.387219475085584) internal successors, (3647), 2638 states have internal predecessors, (3647), 48 states have call successors, (48), 30 states have call predecessors, (48), 30 states have return successors, (72), 48 states have call predecessors, (72), 48 states have call successors, (72) [2021-11-07 02:05:10,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2711 states to 2711 states and 3767 transitions. [2021-11-07 02:05:10,290 INFO L78 Accepts]: Start accepts. Automaton has 2711 states and 3767 transitions. Word has length 45 [2021-11-07 02:05:10,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:10,292 INFO L470 AbstractCegarLoop]: Abstraction has 2711 states and 3767 transitions. [2021-11-07 02:05:10,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:10,292 INFO L276 IsEmpty]: Start isEmpty. Operand 2711 states and 3767 transitions. [2021-11-07 02:05:10,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 02:05:10,294 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:10,295 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:10,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:10,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:10,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:10,716 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:10,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:10,717 INFO L85 PathProgramCache]: Analyzing trace with hash 455539249, now seen corresponding path program 1 times [2021-11-07 02:05:10,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:10,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1510877173] [2021-11-07 02:05:10,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:10,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:10,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:10,720 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:10,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:05:11,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:11,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:11,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:11,945 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:11,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:12,471 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:12,471 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:12,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1510877173] [2021-11-07 02:05:12,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1510877173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:12,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [956800694] [2021-11-07 02:05:12,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:12,472 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:12,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:12,478 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:12,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-07 02:05:13,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:13,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:13,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:13,852 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:13,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:14,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:14,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [956800694] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:14,148 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:14,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:14,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692020476] [2021-11-07 02:05:14,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:14,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:14,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:14,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:14,150 INFO L87 Difference]: Start difference. First operand 2711 states and 3767 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:14,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:14,349 INFO L93 Difference]: Finished difference Result 2711 states and 3767 transitions. [2021-11-07 02:05:14,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:14,349 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 02:05:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:14,377 INFO L225 Difference]: With dead ends: 2711 [2021-11-07 02:05:14,378 INFO L226 Difference]: Without dead ends: 2709 [2021-11-07 02:05:14,380 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:14,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2709 states. [2021-11-07 02:05:14,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2709 to 2709. [2021-11-07 02:05:14,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2709 states, 2628 states have (on average 1.3869863013698631) internal successors, (3645), 2636 states have internal predecessors, (3645), 48 states have call successors, (48), 30 states have call predecessors, (48), 30 states have return successors, (72), 48 states have call predecessors, (72), 48 states have call successors, (72) [2021-11-07 02:05:14,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2709 states to 2709 states and 3765 transitions. [2021-11-07 02:05:14,591 INFO L78 Accepts]: Start accepts. Automaton has 2709 states and 3765 transitions. Word has length 46 [2021-11-07 02:05:14,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:14,591 INFO L470 AbstractCegarLoop]: Abstraction has 2709 states and 3765 transitions. [2021-11-07 02:05:14,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 2 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:14,592 INFO L276 IsEmpty]: Start isEmpty. Operand 2709 states and 3765 transitions. [2021-11-07 02:05:14,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 02:05:14,593 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:14,593 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:14,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:14,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:15,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:15,015 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:15,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:15,015 INFO L85 PathProgramCache]: Analyzing trace with hash 1236822283, now seen corresponding path program 1 times [2021-11-07 02:05:15,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:15,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1327020490] [2021-11-07 02:05:15,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:15,016 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:15,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:15,017 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:15,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:05:15,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:15,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:15,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:16,156 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:16,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:16,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:16,603 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:16,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1327020490] [2021-11-07 02:05:16,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1327020490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:16,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1549664417] [2021-11-07 02:05:16,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:16,604 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:16,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:16,605 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:16,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-07 02:05:17,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:17,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 622 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:17,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:18,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:18,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:18,456 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:18,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1549664417] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:18,457 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:18,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:18,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161877675] [2021-11-07 02:05:18,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:18,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:18,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:18,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:18,459 INFO L87 Difference]: Start difference. First operand 2709 states and 3765 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:18,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:18,611 INFO L93 Difference]: Finished difference Result 2709 states and 3765 transitions. [2021-11-07 02:05:18,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:18,612 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 02:05:18,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:18,631 INFO L225 Difference]: With dead ends: 2709 [2021-11-07 02:05:18,631 INFO L226 Difference]: Without dead ends: 2707 [2021-11-07 02:05:18,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:18,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2707 states. [2021-11-07 02:05:18,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2707 to 2707. [2021-11-07 02:05:18,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2707 states, 2627 states have (on average 1.3867529501332319) internal successors, (3643), 2634 states have internal predecessors, (3643), 48 states have call successors, (48), 30 states have call predecessors, (48), 30 states have return successors, (72), 48 states have call predecessors, (72), 48 states have call successors, (72) [2021-11-07 02:05:18,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2707 states to 2707 states and 3763 transitions. [2021-11-07 02:05:18,856 INFO L78 Accepts]: Start accepts. Automaton has 2707 states and 3763 transitions. Word has length 47 [2021-11-07 02:05:18,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:18,857 INFO L470 AbstractCegarLoop]: Abstraction has 2707 states and 3763 transitions. [2021-11-07 02:05:18,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:18,858 INFO L276 IsEmpty]: Start isEmpty. Operand 2707 states and 3763 transitions. [2021-11-07 02:05:18,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 02:05:18,859 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:18,859 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:18,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:19,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:19,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:19,275 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:19,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:19,276 INFO L85 PathProgramCache]: Analyzing trace with hash -313207429, now seen corresponding path program 1 times [2021-11-07 02:05:19,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:19,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [536965655] [2021-11-07 02:05:19,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:19,277 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:19,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:19,277 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:19,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:05:20,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:20,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:20,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:20,590 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:20,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:21,083 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:05:21,084 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:21,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [536965655] [2021-11-07 02:05:21,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [536965655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:21,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1303653318] [2021-11-07 02:05:21,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:21,084 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:21,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:21,085 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:21,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:05:22,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:22,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:22,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:22,526 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:22,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:22,827 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:22,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1303653318] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:22,828 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:22,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:22,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081236840] [2021-11-07 02:05:22,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:22,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:22,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:22,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:22,829 INFO L87 Difference]: Start difference. First operand 2707 states and 3763 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:22,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:22,994 INFO L93 Difference]: Finished difference Result 2707 states and 3763 transitions. [2021-11-07 02:05:22,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:22,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 02:05:22,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:23,012 INFO L225 Difference]: With dead ends: 2707 [2021-11-07 02:05:23,013 INFO L226 Difference]: Without dead ends: 2698 [2021-11-07 02:05:23,015 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:23,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2698 states. [2021-11-07 02:05:23,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2698 to 2698. [2021-11-07 02:05:23,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2698 states, 2619 states have (on average 1.3867888507063766) internal successors, (3632), 2625 states have internal predecessors, (3632), 48 states have call successors, (48), 30 states have call predecessors, (48), 30 states have return successors, (72), 48 states have call predecessors, (72), 48 states have call successors, (72) [2021-11-07 02:05:23,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2698 states to 2698 states and 3752 transitions. [2021-11-07 02:05:23,220 INFO L78 Accepts]: Start accepts. Automaton has 2698 states and 3752 transitions. Word has length 48 [2021-11-07 02:05:23,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:23,220 INFO L470 AbstractCegarLoop]: Abstraction has 2698 states and 3752 transitions. [2021-11-07 02:05:23,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 2 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:23,221 INFO L276 IsEmpty]: Start isEmpty. Operand 2698 states and 3752 transitions. [2021-11-07 02:05:23,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 02:05:23,227 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:23,227 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:23,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:23,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:23,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:23,649 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:23,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:23,650 INFO L85 PathProgramCache]: Analyzing trace with hash 391686155, now seen corresponding path program 1 times [2021-11-07 02:05:23,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:23,651 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2143921430] [2021-11-07 02:05:23,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:23,651 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:23,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:23,653 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:23,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 02:05:24,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:24,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:24,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:25,062 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:25,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:25,596 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:25,596 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:25,596 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2143921430] [2021-11-07 02:05:25,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2143921430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:25,596 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [232937227] [2021-11-07 02:05:25,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:25,597 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:25,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:25,597 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:25,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 02:05:26,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:26,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:26,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:27,067 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:27,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:27,311 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:05:27,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [232937227] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:27,312 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:27,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:27,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068428807] [2021-11-07 02:05:27,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:27,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:27,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:27,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:27,314 INFO L87 Difference]: Start difference. First operand 2698 states and 3752 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:27,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:27,867 INFO L93 Difference]: Finished difference Result 7540 states and 10542 transitions. [2021-11-07 02:05:27,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:27,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 02:05:27,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:27,904 INFO L225 Difference]: With dead ends: 7540 [2021-11-07 02:05:27,904 INFO L226 Difference]: Without dead ends: 4867 [2021-11-07 02:05:27,914 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:27,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4867 states. [2021-11-07 02:05:28,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4867 to 4592. [2021-11-07 02:05:28,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4592 states, 4441 states have (on average 1.3936050439090295) internal successors, (6189), 4453 states have internal predecessors, (6189), 90 states have call successors, (90), 60 states have call predecessors, (90), 60 states have return successors, (207), 90 states have call predecessors, (207), 90 states have call successors, (207) [2021-11-07 02:05:28,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4592 states to 4592 states and 6486 transitions. [2021-11-07 02:05:28,313 INFO L78 Accepts]: Start accepts. Automaton has 4592 states and 6486 transitions. Word has length 69 [2021-11-07 02:05:28,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:28,313 INFO L470 AbstractCegarLoop]: Abstraction has 4592 states and 6486 transitions. [2021-11-07 02:05:28,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:28,314 INFO L276 IsEmpty]: Start isEmpty. Operand 4592 states and 6486 transitions. [2021-11-07 02:05:28,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-07 02:05:28,326 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:28,326 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:28,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:28,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:28,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:28,736 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:28,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:28,736 INFO L85 PathProgramCache]: Analyzing trace with hash 426870399, now seen corresponding path program 1 times [2021-11-07 02:05:28,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:28,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2097516292] [2021-11-07 02:05:28,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:28,738 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:28,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:28,739 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:28,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:05:30,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:30,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:30,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:30,694 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:05:30,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:31,513 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:05:31,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:31,513 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2097516292] [2021-11-07 02:05:31,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2097516292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:31,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [770614995] [2021-11-07 02:05:31,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:31,514 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:31,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:31,516 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:31,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-07 02:05:32,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:32,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:32,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:33,429 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 02:05:33,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:33,913 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 02:05:33,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [770614995] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:33,913 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:33,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:33,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089371383] [2021-11-07 02:05:33,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:33,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:33,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:33,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:33,916 INFO L87 Difference]: Start difference. First operand 4592 states and 6486 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:36,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:36,558 INFO L93 Difference]: Finished difference Result 12899 states and 18265 transitions. [2021-11-07 02:05:36,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:36,558 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-07 02:05:36,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:36,622 INFO L225 Difference]: With dead ends: 12899 [2021-11-07 02:05:36,622 INFO L226 Difference]: Without dead ends: 8332 [2021-11-07 02:05:36,638 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:36,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8332 states. [2021-11-07 02:05:37,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8332 to 8305. [2021-11-07 02:05:37,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8305 states, 8004 states have (on average 1.395177411294353) internal successors, (11167), 8028 states have internal predecessors, (11167), 180 states have call successors, (180), 120 states have call predecessors, (180), 120 states have return successors, (414), 180 states have call predecessors, (414), 180 states have call successors, (414) [2021-11-07 02:05:37,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8305 states to 8305 states and 11761 transitions. [2021-11-07 02:05:37,339 INFO L78 Accepts]: Start accepts. Automaton has 8305 states and 11761 transitions. Word has length 120 [2021-11-07 02:05:37,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:37,340 INFO L470 AbstractCegarLoop]: Abstraction has 8305 states and 11761 transitions. [2021-11-07 02:05:37,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:37,341 INFO L276 IsEmpty]: Start isEmpty. Operand 8305 states and 11761 transitions. [2021-11-07 02:05:37,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-07 02:05:37,347 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:37,348 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:37,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:37,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:37,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:37,769 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:37,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:37,770 INFO L85 PathProgramCache]: Analyzing trace with hash -1407560192, now seen corresponding path program 1 times [2021-11-07 02:05:37,771 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:37,771 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2074084101] [2021-11-07 02:05:37,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:37,771 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:37,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:37,772 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:37,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-07 02:05:39,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:39,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:39,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:39,742 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-07 02:05:39,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-07 02:05:40,435 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:40,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2074084101] [2021-11-07 02:05:40,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2074084101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:40,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [620958552] [2021-11-07 02:05:40,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:40,436 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:40,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:40,442 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:40,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-07 02:05:41,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:41,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:41,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:42,260 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-07 02:05:42,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:42,635 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-07 02:05:42,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [620958552] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:42,636 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:42,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:05:42,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646531632] [2021-11-07 02:05:42,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:05:42,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:42,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:05:42,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:42,638 INFO L87 Difference]: Start difference. First operand 8305 states and 11761 transitions. Second operand has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:47,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:47,235 INFO L93 Difference]: Finished difference Result 19753 states and 27993 transitions. [2021-11-07 02:05:47,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:05:47,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-07 02:05:47,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:47,300 INFO L225 Difference]: With dead ends: 19753 [2021-11-07 02:05:47,301 INFO L226 Difference]: Without dead ends: 11473 [2021-11-07 02:05:47,323 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 501 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:05:47,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11473 states. [2021-11-07 02:05:47,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11473 to 8425. [2021-11-07 02:05:47,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8425 states, 8124 states have (on average 1.3982028557360906) internal successors, (11359), 8148 states have internal predecessors, (11359), 180 states have call successors, (180), 120 states have call predecessors, (180), 120 states have return successors, (414), 180 states have call predecessors, (414), 180 states have call successors, (414) [2021-11-07 02:05:47,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8425 states to 8425 states and 11953 transitions. [2021-11-07 02:05:47,972 INFO L78 Accepts]: Start accepts. Automaton has 8425 states and 11953 transitions. Word has length 128 [2021-11-07 02:05:47,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:47,972 INFO L470 AbstractCegarLoop]: Abstraction has 8425 states and 11953 transitions. [2021-11-07 02:05:47,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.0) internal successors, (123), 3 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:47,973 INFO L276 IsEmpty]: Start isEmpty. Operand 8425 states and 11953 transitions. [2021-11-07 02:05:47,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-07 02:05:47,980 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:47,980 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:48,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:48,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:48,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:48,403 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:48,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:48,404 INFO L85 PathProgramCache]: Analyzing trace with hash 231818397, now seen corresponding path program 1 times [2021-11-07 02:05:48,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:48,405 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1424667766] [2021-11-07 02:05:48,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:48,405 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:48,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:48,406 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:48,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-07 02:05:49,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:49,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 1062 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:49,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-07 02:05:50,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:51,232 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-07 02:05:51,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:51,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1424667766] [2021-11-07 02:05:51,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1424667766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:51,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [720336885] [2021-11-07 02:05:51,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:51,232 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:51,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:51,233 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:51,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-07 02:05:52,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:52,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 1062 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:05:52,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:53,169 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 02:05:53,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:53,580 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 02:05:53,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [720336885] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:53,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:53,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-07 02:05:53,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865529553] [2021-11-07 02:05:53,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:05:53,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:53,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:05:53,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:53,582 INFO L87 Difference]: Start difference. First operand 8425 states and 11953 transitions. Second operand has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:56,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:56,688 INFO L93 Difference]: Finished difference Result 21207 states and 30353 transitions. [2021-11-07 02:05:56,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:05:56,689 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2021-11-07 02:05:56,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:56,738 INFO L225 Difference]: With dead ends: 21207 [2021-11-07 02:05:56,738 INFO L226 Difference]: Without dead ends: 12807 [2021-11-07 02:05:56,761 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 536 GetRequests, 528 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:05:56,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12807 states. [2021-11-07 02:05:57,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12807 to 12257. [2021-11-07 02:05:57,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12257 states, 11824 states have (on average 1.413650202976996) internal successors, (16715), 11860 states have internal predecessors, (16715), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:05:57,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12257 states to 12257 states and 17597 transitions. [2021-11-07 02:05:57,719 INFO L78 Accepts]: Start accepts. Automaton has 12257 states and 17597 transitions. Word has length 135 [2021-11-07 02:05:57,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:57,720 INFO L470 AbstractCegarLoop]: Abstraction has 12257 states and 17597 transitions. [2021-11-07 02:05:57,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:57,720 INFO L276 IsEmpty]: Start isEmpty. Operand 12257 states and 17597 transitions. [2021-11-07 02:05:57,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-07 02:05:57,733 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:57,733 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:05:57,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:57,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:58,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:58,147 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:05:58,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:58,148 INFO L85 PathProgramCache]: Analyzing trace with hash 425665509, now seen corresponding path program 1 times [2021-11-07 02:05:58,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:58,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [280369235] [2021-11-07 02:05:58,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:58,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:58,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:58,150 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:58,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-07 02:05:59,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:59,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 1154 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:05:59,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:00,525 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:00,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:01,380 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:01,381 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:01,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [280369235] [2021-11-07 02:06:01,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [280369235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:01,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1001028351] [2021-11-07 02:06:01,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:01,381 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:01,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:01,382 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:01,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-07 02:06:03,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:03,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 1154 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:06:03,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:04,081 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:06:04,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:04,666 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 02:06:04,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1001028351] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:04,667 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:04,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 15 [2021-11-07 02:06:04,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86866798] [2021-11-07 02:06:04,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:06:04,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:04,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:06:04,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-11-07 02:06:04,669 INFO L87 Difference]: Start difference. First operand 12257 states and 17597 transitions. Second operand has 9 states, 9 states have (on average 16.77777777777778) internal successors, (151), 9 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:10,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:10,676 INFO L93 Difference]: Finished difference Result 48084 states and 69386 transitions. [2021-11-07 02:06:10,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:06:10,677 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 16.77777777777778) internal successors, (151), 9 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2021-11-07 02:06:10,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:10,794 INFO L225 Difference]: With dead ends: 48084 [2021-11-07 02:06:10,795 INFO L226 Difference]: Without dead ends: 35852 [2021-11-07 02:06:10,830 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 631 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2021-11-07 02:06:10,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35852 states. [2021-11-07 02:06:12,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35852 to 12473. [2021-11-07 02:06:12,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12473 states, 12040 states have (on average 1.4062292358803987) internal successors, (16931), 12076 states have internal predecessors, (16931), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:06:12,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12473 states to 12473 states and 17813 transitions. [2021-11-07 02:06:12,386 INFO L78 Accepts]: Start accepts. Automaton has 12473 states and 17813 transitions. Word has length 161 [2021-11-07 02:06:12,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:12,387 INFO L470 AbstractCegarLoop]: Abstraction has 12473 states and 17813 transitions. [2021-11-07 02:06:12,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 16.77777777777778) internal successors, (151), 9 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:12,388 INFO L276 IsEmpty]: Start isEmpty. Operand 12473 states and 17813 transitions. [2021-11-07 02:06:12,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-07 02:06:12,401 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:12,402 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:06:12,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:12,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:12,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:06:12,815 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:06:12,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:12,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1162682393, now seen corresponding path program 1 times [2021-11-07 02:06:12,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:12,817 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1809973927] [2021-11-07 02:06:12,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:12,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:12,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:12,820 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:12,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-07 02:06:14,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:15,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:06:15,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:15,812 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:15,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:16,814 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:16,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:16,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1809973927] [2021-11-07 02:06:16,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1809973927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:16,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [73977869] [2021-11-07 02:06:16,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:16,815 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:16,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:16,816 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:16,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-07 02:06:18,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:18,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:06:18,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:19,749 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 02:06:19,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:20,469 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 02:06:20,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [73977869] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:20,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:20,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-07 02:06:20,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128412170] [2021-11-07 02:06:20,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:06:20,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:20,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:06:20,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-07 02:06:20,472 INFO L87 Difference]: Start difference. First operand 12473 states and 17813 transitions. Second operand has 6 states, 6 states have (on average 25.166666666666668) internal successors, (151), 6 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:26,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:26,663 INFO L93 Difference]: Finished difference Result 29593 states and 42171 transitions. [2021-11-07 02:06:26,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:06:26,664 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.166666666666668) internal successors, (151), 6 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2021-11-07 02:06:26,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:26,726 INFO L225 Difference]: With dead ends: 29593 [2021-11-07 02:06:26,727 INFO L226 Difference]: Without dead ends: 17097 [2021-11-07 02:06:26,755 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 641 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:06:26,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17097 states. [2021-11-07 02:06:27,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17097 to 12473. [2021-11-07 02:06:27,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12473 states, 12040 states have (on average 1.4042358803986712) internal successors, (16907), 12076 states have internal predecessors, (16907), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:06:27,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12473 states to 12473 states and 17789 transitions. [2021-11-07 02:06:27,795 INFO L78 Accepts]: Start accepts. Automaton has 12473 states and 17789 transitions. Word has length 161 [2021-11-07 02:06:27,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:27,796 INFO L470 AbstractCegarLoop]: Abstraction has 12473 states and 17789 transitions. [2021-11-07 02:06:27,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.166666666666668) internal successors, (151), 6 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:27,796 INFO L276 IsEmpty]: Start isEmpty. Operand 12473 states and 17789 transitions. [2021-11-07 02:06:27,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-07 02:06:27,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:27,809 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:06:27,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:28,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:28,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:28,231 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:06:28,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:28,232 INFO L85 PathProgramCache]: Analyzing trace with hash 696263107, now seen corresponding path program 1 times [2021-11-07 02:06:28,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:28,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [727079887] [2021-11-07 02:06:28,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:28,233 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:28,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:28,235 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:28,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-07 02:06:30,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:30,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 1171 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:06:30,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:31,115 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:31,115 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:32,044 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:06:32,045 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:32,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [727079887] [2021-11-07 02:06:32,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [727079887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:32,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2067557420] [2021-11-07 02:06:32,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:32,046 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:32,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:32,051 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:32,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-07 02:06:34,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:34,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 1171 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:06:34,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:35,255 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 02:06:35,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:36,208 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 02:06:36,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2067557420] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:36,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:36,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-07 02:06:36,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107368319] [2021-11-07 02:06:36,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:06:36,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:36,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:06:36,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:06:36,211 INFO L87 Difference]: Start difference. First operand 12473 states and 17789 transitions. Second operand has 4 states, 4 states have (on average 42.0) internal successors, (168), 4 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:37,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:37,674 INFO L93 Difference]: Finished difference Result 29665 states and 42351 transitions. [2021-11-07 02:06:37,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:06:37,676 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 42.0) internal successors, (168), 4 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2021-11-07 02:06:37,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:37,740 INFO L225 Difference]: With dead ends: 29665 [2021-11-07 02:06:37,740 INFO L226 Difference]: Without dead ends: 17217 [2021-11-07 02:06:37,764 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 640 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:06:37,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17217 states. [2021-11-07 02:06:39,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17217 to 12905. [2021-11-07 02:06:39,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12905 states, 12472 states have (on average 1.4133258499037844) internal successors, (17627), 12508 states have internal predecessors, (17627), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:06:39,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12905 states to 12905 states and 18509 transitions. [2021-11-07 02:06:39,064 INFO L78 Accepts]: Start accepts. Automaton has 12905 states and 18509 transitions. Word has length 163 [2021-11-07 02:06:39,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:39,065 INFO L470 AbstractCegarLoop]: Abstraction has 12905 states and 18509 transitions. [2021-11-07 02:06:39,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 42.0) internal successors, (168), 4 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:06:39,065 INFO L276 IsEmpty]: Start isEmpty. Operand 12905 states and 18509 transitions. [2021-11-07 02:06:39,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-07 02:06:39,079 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:39,080 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:06:39,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:39,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:39,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:39,507 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:06:39,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:39,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1405965008, now seen corresponding path program 1 times [2021-11-07 02:06:39,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:06:39,509 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1530289400] [2021-11-07 02:06:39,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:39,509 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:06:39,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:06:39,510 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:06:39,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-07 02:06:41,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:41,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:06:41,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:42,725 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:06:42,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:43,767 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:06:43,767 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:06:43,767 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1530289400] [2021-11-07 02:06:43,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1530289400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:06:43,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1760757660] [2021-11-07 02:06:43,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:43,768 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:06:43,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:06:43,775 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:06:43,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-07 02:06:46,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:46,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:06:46,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:46,967 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:06:46,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:47,775 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:06:47,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1760757660] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:06:47,776 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:06:47,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-07 02:06:47,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80081851] [2021-11-07 02:06:47,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 02:06:47,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:06:47,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 02:06:47,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:06:47,778 INFO L87 Difference]: Start difference. First operand 12905 states and 18509 transitions. Second operand has 8 states, 8 states have (on average 19.5) internal successors, (156), 8 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:01,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:01,668 INFO L93 Difference]: Finished difference Result 56485 states and 80355 transitions. [2021-11-07 02:07:01,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:07:01,669 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 19.5) internal successors, (156), 8 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 170 [2021-11-07 02:07:01,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:01,884 INFO L225 Difference]: With dead ends: 56485 [2021-11-07 02:07:01,884 INFO L226 Difference]: Without dead ends: 43605 [2021-11-07 02:07:01,913 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 668 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:07:01,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43605 states. [2021-11-07 02:07:03,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43605 to 12977. [2021-11-07 02:07:03,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12977 states, 12544 states have (on average 1.410953443877551) internal successors, (17699), 12580 states have internal predecessors, (17699), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:07:03,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12977 states to 12977 states and 18581 transitions. [2021-11-07 02:07:03,581 INFO L78 Accepts]: Start accepts. Automaton has 12977 states and 18581 transitions. Word has length 170 [2021-11-07 02:07:03,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:03,582 INFO L470 AbstractCegarLoop]: Abstraction has 12977 states and 18581 transitions. [2021-11-07 02:07:03,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 19.5) internal successors, (156), 8 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:03,582 INFO L276 IsEmpty]: Start isEmpty. Operand 12977 states and 18581 transitions. [2021-11-07 02:07:03,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-07 02:07:03,593 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:03,594 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:07:03,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:03,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:04,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:04,007 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:07:04,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:04,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1597993548, now seen corresponding path program 1 times [2021-11-07 02:07:04,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:04,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [145569580] [2021-11-07 02:07:04,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:04,009 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:04,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:04,010 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:04,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-07 02:07:06,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:06,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 1197 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:07:06,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:07,190 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:07:07,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:08,293 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:07:08,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:08,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [145569580] [2021-11-07 02:07:08,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [145569580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:08,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [503610363] [2021-11-07 02:07:08,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:08,295 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:08,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:08,305 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:08,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-07 02:07:11,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:11,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 1197 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:07:11,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:12,078 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:07:12,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:12,901 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:07:12,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [503610363] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:07:12,902 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:07:12,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 15 [2021-11-07 02:07:12,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619969413] [2021-11-07 02:07:12,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:07:12,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:12,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:07:12,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-07 02:07:12,904 INFO L87 Difference]: Start difference. First operand 12977 states and 18581 transitions. Second operand has 9 states, 9 states have (on average 19.11111111111111) internal successors, (172), 9 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:07:59,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:59,568 INFO L93 Difference]: Finished difference Result 56785 states and 80799 transitions. [2021-11-07 02:07:59,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:07:59,569 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 19.11111111111111) internal successors, (172), 9 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2021-11-07 02:07:59,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:59,677 INFO L225 Difference]: With dead ends: 56785 [2021-11-07 02:07:59,677 INFO L226 Difference]: Without dead ends: 43833 [2021-11-07 02:07:59,703 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 678 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:07:59,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43833 states. [2021-11-07 02:08:01,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43833 to 13049. [2021-11-07 02:08:01,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13049 states, 12616 states have (on average 1.4086081166772353) internal successors, (17771), 12652 states have internal predecessors, (17771), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:08:01,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13049 states to 13049 states and 18653 transitions. [2021-11-07 02:08:01,291 INFO L78 Accepts]: Start accepts. Automaton has 13049 states and 18653 transitions. Word has length 172 [2021-11-07 02:08:01,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:08:01,291 INFO L470 AbstractCegarLoop]: Abstraction has 13049 states and 18653 transitions. [2021-11-07 02:08:01,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 19.11111111111111) internal successors, (172), 9 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:01,292 INFO L276 IsEmpty]: Start isEmpty. Operand 13049 states and 18653 transitions. [2021-11-07 02:08:01,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-07 02:08:01,301 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:08:01,302 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:08:01,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:01,526 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-11-07 02:08:01,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:01,715 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:08:01,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:08:01,716 INFO L85 PathProgramCache]: Analyzing trace with hash -41999496, now seen corresponding path program 1 times [2021-11-07 02:08:01,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:08:01,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [978353888] [2021-11-07 02:08:01,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:01,717 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:08:01,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:08:01,718 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:08:01,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-07 02:08:03,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:04,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 1208 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:08:04,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:04,713 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:08:04,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:05,569 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:08:05,570 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:08:05,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [978353888] [2021-11-07 02:08:05,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [978353888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:08:05,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1924786794] [2021-11-07 02:08:05,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:05,570 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:05,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:08:05,575 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:08:05,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-07 02:08:08,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:08,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 1208 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 02:08:08,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:08,871 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:08:08,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:09,387 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:08:09,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1924786794] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:08:09,388 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:08:09,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 13 [2021-11-07 02:08:09,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549182368] [2021-11-07 02:08:09,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:08:09,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:08:09,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:08:09,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:08:09,390 INFO L87 Difference]: Start difference. First operand 13049 states and 18653 transitions. Second operand has 7 states, 7 states have (on average 25.0) internal successors, (175), 7 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:19,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:08:19,206 INFO L93 Difference]: Finished difference Result 45317 states and 65015 transitions. [2021-11-07 02:08:19,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:08:19,207 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 25.0) internal successors, (175), 7 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2021-11-07 02:08:19,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:08:19,274 INFO L225 Difference]: With dead ends: 45317 [2021-11-07 02:08:19,275 INFO L226 Difference]: Without dead ends: 32293 [2021-11-07 02:08:19,297 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 686 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:08:19,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32293 states. [2021-11-07 02:08:20,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32293 to 13193. [2021-11-07 02:08:20,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13193 states, 12760 states have (on average 1.4068181818181817) internal successors, (17951), 12796 states have internal predecessors, (17951), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:08:20,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13193 states to 13193 states and 18833 transitions. [2021-11-07 02:08:20,893 INFO L78 Accepts]: Start accepts. Automaton has 13193 states and 18833 transitions. Word has length 174 [2021-11-07 02:08:20,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:08:20,893 INFO L470 AbstractCegarLoop]: Abstraction has 13193 states and 18833 transitions. [2021-11-07 02:08:20,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 25.0) internal successors, (175), 7 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:20,894 INFO L276 IsEmpty]: Start isEmpty. Operand 13193 states and 18833 transitions. [2021-11-07 02:08:20,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-07 02:08:20,901 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:08:20,901 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:08:20,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:21,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:21,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:21,315 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:08:21,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:08:21,316 INFO L85 PathProgramCache]: Analyzing trace with hash -545876588, now seen corresponding path program 1 times [2021-11-07 02:08:21,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:08:21,317 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2024416294] [2021-11-07 02:08:21,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:21,317 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:08:21,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:08:21,318 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:08:21,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-07 02:08:23,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:23,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 1219 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:08:23,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:24,537 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:08:24,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:25,463 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:08:25,463 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:08:25,463 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2024416294] [2021-11-07 02:08:25,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2024416294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:08:25,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [371640774] [2021-11-07 02:08:25,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:25,464 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:25,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:08:25,465 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:08:25,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-07 02:08:28,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:28,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 1219 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 02:08:28,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:29,047 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:08:29,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:29,388 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:08:29,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [371640774] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:08:29,389 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:08:29,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 02:08:29,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660731195] [2021-11-07 02:08:29,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:08:29,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:08:29,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:08:29,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 02:08:29,390 INFO L87 Difference]: Start difference. First operand 13193 states and 18833 transitions. Second operand has 6 states, 6 states have (on average 26.333333333333332) internal successors, (158), 6 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:38,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:08:38,307 INFO L93 Difference]: Finished difference Result 49573 states and 71335 transitions. [2021-11-07 02:08:38,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-07 02:08:38,310 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.333333333333332) internal successors, (158), 6 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-07 02:08:38,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:08:38,363 INFO L225 Difference]: With dead ends: 49573 [2021-11-07 02:08:38,363 INFO L226 Difference]: Without dead ends: 36405 [2021-11-07 02:08:38,380 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 720 GetRequests, 699 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-11-07 02:08:38,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36405 states. [2021-11-07 02:08:39,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36405 to 12953. [2021-11-07 02:08:39,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12953 states, 12520 states have (on average 1.4088658146964856) internal successors, (17639), 12556 states have internal predecessors, (17639), 252 states have call successors, (252), 180 states have call predecessors, (252), 180 states have return successors, (630), 252 states have call predecessors, (630), 252 states have call successors, (630) [2021-11-07 02:08:39,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12953 states to 12953 states and 18521 transitions. [2021-11-07 02:08:39,981 INFO L78 Accepts]: Start accepts. Automaton has 12953 states and 18521 transitions. Word has length 176 [2021-11-07 02:08:39,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:08:39,981 INFO L470 AbstractCegarLoop]: Abstraction has 12953 states and 18521 transitions. [2021-11-07 02:08:39,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.333333333333332) internal successors, (158), 6 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:39,981 INFO L276 IsEmpty]: Start isEmpty. Operand 12953 states and 18521 transitions. [2021-11-07 02:08:39,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-11-07 02:08:39,988 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:08:39,988 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:08:40,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:40,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:40,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:40,390 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:08:40,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:08:40,390 INFO L85 PathProgramCache]: Analyzing trace with hash -2014129465, now seen corresponding path program 1 times [2021-11-07 02:08:40,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:08:40,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1308846867] [2021-11-07 02:08:40,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:40,392 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:08:40,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:08:40,393 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:08:40,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-07 02:08:42,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:42,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 1198 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:08:42,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:43,647 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-07 02:08:43,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:44,527 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-07 02:08:44,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:08:44,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1308846867] [2021-11-07 02:08:44,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1308846867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:08:44,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1139856874] [2021-11-07 02:08:44,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:44,528 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:44,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:08:44,530 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:08:44,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-07 02:08:47,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:47,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 1198 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:08:47,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:48,061 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:08:48,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:48,405 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:08:48,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1139856874] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:08:48,405 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:08:48,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 02:08:48,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791200376] [2021-11-07 02:08:48,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:08:48,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:08:48,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:08:48,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:08:48,407 INFO L87 Difference]: Start difference. First operand 12953 states and 18521 transitions. Second operand has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:52,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:08:52,942 INFO L93 Difference]: Finished difference Result 37729 states and 53899 transitions. [2021-11-07 02:08:52,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:08:52,942 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 179 [2021-11-07 02:08:52,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:08:52,991 INFO L225 Difference]: With dead ends: 37729 [2021-11-07 02:08:52,991 INFO L226 Difference]: Without dead ends: 24801 [2021-11-07 02:08:53,009 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 705 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:08:53,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24801 states. [2021-11-07 02:08:55,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24801 to 20954. [2021-11-07 02:08:55,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20954 states, 20233 states have (on average 1.4131369544803045) internal successors, (28592), 20293 states have internal predecessors, (28592), 420 states have call successors, (420), 300 states have call predecessors, (420), 300 states have return successors, (1008), 420 states have call predecessors, (1008), 420 states have call successors, (1008) [2021-11-07 02:08:55,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20954 states to 20954 states and 30020 transitions. [2021-11-07 02:08:55,140 INFO L78 Accepts]: Start accepts. Automaton has 20954 states and 30020 transitions. Word has length 179 [2021-11-07 02:08:55,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:08:55,140 INFO L470 AbstractCegarLoop]: Abstraction has 20954 states and 30020 transitions. [2021-11-07 02:08:55,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 39.75) internal successors, (159), 4 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:08:55,141 INFO L276 IsEmpty]: Start isEmpty. Operand 20954 states and 30020 transitions. [2021-11-07 02:08:55,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-07 02:08:55,153 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:08:55,153 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:08:55,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:55,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-07 02:08:55,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:08:55,567 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:08:55,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:08:55,568 INFO L85 PathProgramCache]: Analyzing trace with hash 2047552122, now seen corresponding path program 1 times [2021-11-07 02:08:55,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:08:55,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [562566085] [2021-11-07 02:08:55,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:55,569 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:08:55,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:08:55,570 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:08:55,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-07 02:08:58,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:08:58,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 1230 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:08:58,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:08:59,052 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-07 02:08:59,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:08:59,926 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-07 02:08:59,926 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:08:59,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [562566085] [2021-11-07 02:08:59,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [562566085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:08:59,926 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1681534798] [2021-11-07 02:08:59,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:08:59,927 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:08:59,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:08:59,927 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:08:59,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-07 02:09:03,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:03,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1230 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:09:03,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:04,295 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:09:04,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:05,468 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 02:09:05,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1681534798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:09:05,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076246680] [2021-11-07 02:09:05,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:05,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:09:05,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:09:05,471 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:09:05,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-07 02:09:08,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:08,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 1230 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:09:08,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:09,751 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:09:09,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:10,903 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-07 02:09:10,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076246680] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:09:10,904 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 02:09:10,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5, 5, 5] total 18 [2021-11-07 02:09:10,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138549135] [2021-11-07 02:09:10,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:09:10,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:09:10,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:09:10,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:09:10,907 INFO L87 Difference]: Start difference. First operand 20954 states and 30020 transitions. Second operand has 6 states, 6 states have (on average 47.833333333333336) internal successors, (287), 5 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:09:18,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:09:18,354 INFO L93 Difference]: Finished difference Result 48837 states and 70001 transitions. [2021-11-07 02:09:18,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:09:18,357 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 47.833333333333336) internal successors, (287), 5 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 184 [2021-11-07 02:09:18,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:09:18,417 INFO L225 Difference]: With dead ends: 48837 [2021-11-07 02:09:18,417 INFO L226 Difference]: Without dead ends: 27908 [2021-11-07 02:09:18,443 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1099 GetRequests, 1082 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-07 02:09:18,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27908 states. [2021-11-07 02:09:21,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27908 to 21530. [2021-11-07 02:09:21,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21530 states, 20785 states have (on average 1.4096704354101515) internal successors, (29300), 20821 states have internal predecessors, (29300), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:09:21,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21530 states to 21530 states and 30824 transitions. [2021-11-07 02:09:21,308 INFO L78 Accepts]: Start accepts. Automaton has 21530 states and 30824 transitions. Word has length 184 [2021-11-07 02:09:21,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:09:21,309 INFO L470 AbstractCegarLoop]: Abstraction has 21530 states and 30824 transitions. [2021-11-07 02:09:21,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 47.833333333333336) internal successors, (287), 5 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:09:21,309 INFO L276 IsEmpty]: Start isEmpty. Operand 21530 states and 30824 transitions. [2021-11-07 02:09:21,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-07 02:09:21,337 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:09:21,338 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:09:21,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-07 02:09:21,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-07 02:09:21,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-07 02:09:21,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:09:21,963 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:09:21,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:09:21,964 INFO L85 PathProgramCache]: Analyzing trace with hash -566906837, now seen corresponding path program 1 times [2021-11-07 02:09:21,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:09:21,965 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2038067728] [2021-11-07 02:09:21,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:21,966 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:09:21,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:09:21,967 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:09:21,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-07 02:09:25,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:25,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 1360 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:09:25,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:25,954 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:09:25,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:26,933 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:09:26,933 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:09:26,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2038067728] [2021-11-07 02:09:26,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2038067728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:09:26,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [127074763] [2021-11-07 02:09:26,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:26,933 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:09:26,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:09:26,934 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:09:26,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-07 02:09:30,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:30,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 1360 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:09:30,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:31,120 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:09:31,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:31,521 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:09:31,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [127074763] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:09:31,521 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:09:31,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:09:31,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894474258] [2021-11-07 02:09:31,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:09:31,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:09:31,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:09:31,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:09:31,523 INFO L87 Difference]: Start difference. First operand 21530 states and 30824 transitions. Second operand has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:09:34,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:09:34,070 INFO L93 Difference]: Finished difference Result 43095 states and 62821 transitions. [2021-11-07 02:09:34,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:09:34,072 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 201 [2021-11-07 02:09:34,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:09:34,155 INFO L225 Difference]: With dead ends: 43095 [2021-11-07 02:09:34,155 INFO L226 Difference]: Without dead ends: 21590 [2021-11-07 02:09:34,202 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 800 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:09:34,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21590 states. [2021-11-07 02:09:37,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21590 to 21590. [2021-11-07 02:09:37,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21590 states, 20845 states have (on average 1.4084912449028544) internal successors, (29360), 20881 states have internal predecessors, (29360), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:09:37,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21590 states to 21590 states and 30884 transitions. [2021-11-07 02:09:37,521 INFO L78 Accepts]: Start accepts. Automaton has 21590 states and 30884 transitions. Word has length 201 [2021-11-07 02:09:37,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:09:37,522 INFO L470 AbstractCegarLoop]: Abstraction has 21590 states and 30884 transitions. [2021-11-07 02:09:37,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:09:37,523 INFO L276 IsEmpty]: Start isEmpty. Operand 21590 states and 30884 transitions. [2021-11-07 02:09:37,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-07 02:09:37,543 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:09:37,543 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:09:37,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-07 02:09:37,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-07 02:09:37,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:09:37,944 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:09:37,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:09:37,945 INFO L85 PathProgramCache]: Analyzing trace with hash -292147223, now seen corresponding path program 1 times [2021-11-07 02:09:37,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:09:37,946 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [828017200] [2021-11-07 02:09:37,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:37,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:09:37,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:09:37,948 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:09:37,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-07 02:09:41,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:41,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:09:41,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:42,751 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:09:42,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:43,846 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:09:43,846 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:09:43,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [828017200] [2021-11-07 02:09:43,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [828017200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:09:43,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2382398] [2021-11-07 02:09:43,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:43,847 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:09:43,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:09:43,848 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:09:43,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-07 02:09:47,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:47,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:09:47,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:49,463 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 02:09:49,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:50,642 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 02:09:50,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2382398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:09:50,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842881848] [2021-11-07 02:09:50,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:09:50,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:09:50,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:09:50,644 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:09:50,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-07 02:09:54,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:09:54,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:09:54,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:09:55,000 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:09:55,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:09:55,495 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:09:55,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842881848] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:09:55,496 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 02:09:55,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5, 5, 5] total 16 [2021-11-07 02:09:55,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507168525] [2021-11-07 02:09:55,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:09:55,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:09:55,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:09:55,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:09:55,498 INFO L87 Difference]: Start difference. First operand 21590 states and 30884 transitions. Second operand has 4 states, 4 states have (on average 45.75) internal successors, (183), 4 states have internal predecessors, (183), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:09:57,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:09:57,639 INFO L93 Difference]: Finished difference Result 43155 states and 62821 transitions. [2021-11-07 02:09:57,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:09:57,640 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 45.75) internal successors, (183), 4 states have internal predecessors, (183), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 201 [2021-11-07 02:09:57,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:09:57,726 INFO L225 Difference]: With dead ends: 43155 [2021-11-07 02:09:57,726 INFO L226 Difference]: Without dead ends: 21590 [2021-11-07 02:09:57,769 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1200 GetRequests, 1186 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:09:57,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21590 states. [2021-11-07 02:10:00,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21590 to 21590. [2021-11-07 02:10:00,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21590 states, 20845 states have (on average 1.405612856800192) internal successors, (29300), 20881 states have internal predecessors, (29300), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:10:00,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21590 states to 21590 states and 30824 transitions. [2021-11-07 02:10:00,210 INFO L78 Accepts]: Start accepts. Automaton has 21590 states and 30824 transitions. Word has length 201 [2021-11-07 02:10:00,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:10:00,210 INFO L470 AbstractCegarLoop]: Abstraction has 21590 states and 30824 transitions. [2021-11-07 02:10:00,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 45.75) internal successors, (183), 4 states have internal predecessors, (183), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:00,211 INFO L276 IsEmpty]: Start isEmpty. Operand 21590 states and 30824 transitions. [2021-11-07 02:10:00,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-07 02:10:00,223 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:10:00,223 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:10:00,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:00,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:00,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:00,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:00,839 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:10:00,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:10:00,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1982299085, now seen corresponding path program 1 times [2021-11-07 02:10:00,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:10:00,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1732215471] [2021-11-07 02:10:00,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:00,841 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:10:00,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:10:00,842 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:10:00,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-07 02:10:04,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:04,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:10:04,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:05,158 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:05,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:06,141 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:06,141 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:10:06,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1732215471] [2021-11-07 02:10:06,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1732215471] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:10:06,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1147608513] [2021-11-07 02:10:06,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:06,141 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:06,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:10:06,142 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:10:06,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-07 02:10:10,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:10,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:10:10,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:10,822 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:10,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:11,244 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:11,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1147608513] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:10:11,245 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:10:11,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:10:11,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36268081] [2021-11-07 02:10:11,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:10:11,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:10:11,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:10:11,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:11,246 INFO L87 Difference]: Start difference. First operand 21590 states and 30824 transitions. Second operand has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:13,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:10:13,740 INFO L93 Difference]: Finished difference Result 41895 states and 60541 transitions. [2021-11-07 02:10:13,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:10:13,741 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 206 [2021-11-07 02:10:13,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:10:13,784 INFO L225 Difference]: With dead ends: 41895 [2021-11-07 02:10:13,785 INFO L226 Difference]: Without dead ends: 20330 [2021-11-07 02:10:13,819 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 813 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:13,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20330 states. [2021-11-07 02:10:16,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20330 to 20330. [2021-11-07 02:10:16,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20330 states, 19585 states have (on average 1.3765636967066632) internal successors, (26960), 19621 states have internal predecessors, (26960), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:10:16,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20330 states to 20330 states and 28484 transitions. [2021-11-07 02:10:16,293 INFO L78 Accepts]: Start accepts. Automaton has 20330 states and 28484 transitions. Word has length 206 [2021-11-07 02:10:16,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:10:16,294 INFO L470 AbstractCegarLoop]: Abstraction has 20330 states and 28484 transitions. [2021-11-07 02:10:16,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:16,294 INFO L276 IsEmpty]: Start isEmpty. Operand 20330 states and 28484 transitions. [2021-11-07 02:10:16,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-07 02:10:16,303 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:10:16,304 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:10:16,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:16,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:16,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:16,719 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:10:16,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:10:16,719 INFO L85 PathProgramCache]: Analyzing trace with hash 118851017, now seen corresponding path program 1 times [2021-11-07 02:10:16,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:10:16,721 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [534049524] [2021-11-07 02:10:16,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:16,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:10:16,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:10:16,722 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:10:16,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-07 02:10:20,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:20,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:10:20,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:21,263 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:21,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:22,278 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:22,278 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:10:22,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [534049524] [2021-11-07 02:10:22,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [534049524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:10:22,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1953619009] [2021-11-07 02:10:22,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:22,279 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:22,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:10:22,280 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:10:22,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-07 02:10:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:26,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:10:26,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:27,523 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:27,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:28,076 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:28,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1953619009] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:10:28,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:10:28,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:10:28,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462076893] [2021-11-07 02:10:28,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:10:28,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:10:28,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:10:28,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:28,079 INFO L87 Difference]: Start difference. First operand 20330 states and 28484 transitions. Second operand has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:30,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:10:30,398 INFO L93 Difference]: Finished difference Result 40455 states and 57781 transitions. [2021-11-07 02:10:30,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:10:30,399 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 208 [2021-11-07 02:10:30,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:10:30,444 INFO L225 Difference]: With dead ends: 40455 [2021-11-07 02:10:30,444 INFO L226 Difference]: Without dead ends: 20150 [2021-11-07 02:10:30,477 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 821 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:30,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20150 states. [2021-11-07 02:10:32,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20150 to 20150. [2021-11-07 02:10:32,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20150 states, 19405 states have (on average 1.3738727132182427) internal successors, (26660), 19441 states have internal predecessors, (26660), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:10:32,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20150 states to 20150 states and 28184 transitions. [2021-11-07 02:10:32,792 INFO L78 Accepts]: Start accepts. Automaton has 20150 states and 28184 transitions. Word has length 208 [2021-11-07 02:10:32,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:10:32,793 INFO L470 AbstractCegarLoop]: Abstraction has 20150 states and 28184 transitions. [2021-11-07 02:10:32,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:32,793 INFO L276 IsEmpty]: Start isEmpty. Operand 20150 states and 28184 transitions. [2021-11-07 02:10:32,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-07 02:10:32,802 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:10:32,802 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:10:32,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:33,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (53)] Ended with exit code 0 [2021-11-07 02:10:33,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:33,203 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:10:33,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:10:33,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1388319953, now seen corresponding path program 1 times [2021-11-07 02:10:33,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:10:33,205 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2011130949] [2021-11-07 02:10:33,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:33,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:10:33,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:10:33,206 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:10:33,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-07 02:10:36,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:37,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 1370 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:10:37,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:37,925 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:37,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:38,832 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:38,832 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:10:38,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2011130949] [2021-11-07 02:10:38,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2011130949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:10:38,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1775513150] [2021-11-07 02:10:38,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:38,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:38,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:10:38,833 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:10:38,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-07 02:10:43,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:43,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 1370 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:10:43,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:44,113 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:44,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:44,546 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:10:44,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1775513150] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:10:44,546 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:10:44,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 02:10:44,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043632127] [2021-11-07 02:10:44,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:10:44,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:10:44,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:10:44,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:44,548 INFO L87 Difference]: Start difference. First operand 20150 states and 28184 transitions. Second operand has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:46,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:10:46,869 INFO L93 Difference]: Finished difference Result 40335 states and 57481 transitions. [2021-11-07 02:10:46,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:10:46,870 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 208 [2021-11-07 02:10:46,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:10:46,911 INFO L225 Difference]: With dead ends: 40335 [2021-11-07 02:10:46,911 INFO L226 Difference]: Without dead ends: 20210 [2021-11-07 02:10:46,937 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 821 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:10:46,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20210 states. [2021-11-07 02:10:49,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20210 to 20150. [2021-11-07 02:10:49,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20150 states, 19405 states have (on average 1.3645967534140686) internal successors, (26480), 19441 states have internal predecessors, (26480), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:10:49,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20150 states to 20150 states and 28004 transitions. [2021-11-07 02:10:49,276 INFO L78 Accepts]: Start accepts. Automaton has 20150 states and 28004 transitions. Word has length 208 [2021-11-07 02:10:49,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:10:49,277 INFO L470 AbstractCegarLoop]: Abstraction has 20150 states and 28004 transitions. [2021-11-07 02:10:49,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 02:10:49,277 INFO L276 IsEmpty]: Start isEmpty. Operand 20150 states and 28004 transitions. [2021-11-07 02:10:49,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-11-07 02:10:49,285 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:10:49,285 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:10:49,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:49,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-07 02:10:49,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:49,687 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:10:49,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:10:49,688 INFO L85 PathProgramCache]: Analyzing trace with hash -686321162, now seen corresponding path program 1 times [2021-11-07 02:10:49,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:10:49,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1376359265] [2021-11-07 02:10:49,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:49,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:10:49,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:10:49,690 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:10:49,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-07 02:10:53,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:10:53,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 1374 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:10:53,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:10:54,621 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:54,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:10:55,671 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 02:10:55,671 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:10:55,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1376359265] [2021-11-07 02:10:55,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1376359265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:10:55,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [990611686] [2021-11-07 02:10:55,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:10:55,671 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:10:55,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:10:55,672 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:10:55,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-07 02:11:00,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:00,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 1374 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:11:00,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:02,141 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 02:11:02,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:03,440 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 02:11:03,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [990611686] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:03,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59966093] [2021-11-07 02:11:03,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:03,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:03,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:03,442 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:03,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-07 02:11:08,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:08,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 1374 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 02:11:08,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:09,539 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:11:09,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:10,964 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-07 02:11:10,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59966093] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:11:10,964 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 02:11:10,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [5, 5, 5, 5] total 18 [2021-11-07 02:11:10,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419629839] [2021-11-07 02:11:10,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:11:10,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:11:10,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:11:10,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-07 02:11:10,967 INFO L87 Difference]: Start difference. First operand 20150 states and 28004 transitions. Second operand has 6 states, 6 states have (on average 61.0) internal successors, (366), 6 states have internal predecessors, (366), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 02:11:15,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:11:15,764 INFO L93 Difference]: Finished difference Result 40643 states and 56505 transitions. [2021-11-07 02:11:15,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:11:15,765 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 61.0) internal successors, (366), 6 states have internal predecessors, (366), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 210 [2021-11-07 02:11:15,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:11:15,813 INFO L225 Difference]: With dead ends: 40643 [2021-11-07 02:11:15,814 INFO L226 Difference]: Without dead ends: 20518 [2021-11-07 02:11:15,841 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1255 GetRequests, 1238 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-07 02:11:15,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20518 states. [2021-11-07 02:11:18,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20518 to 20518. [2021-11-07 02:11:18,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20518 states, 19773 states have (on average 1.3610478935922723) internal successors, (26912), 19809 states have internal predecessors, (26912), 444 states have call successors, (444), 300 states have call predecessors, (444), 300 states have return successors, (1080), 468 states have call predecessors, (1080), 444 states have call successors, (1080) [2021-11-07 02:11:18,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20518 states to 20518 states and 28436 transitions. [2021-11-07 02:11:18,188 INFO L78 Accepts]: Start accepts. Automaton has 20518 states and 28436 transitions. Word has length 210 [2021-11-07 02:11:18,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:11:18,189 INFO L470 AbstractCegarLoop]: Abstraction has 20518 states and 28436 transitions. [2021-11-07 02:11:18,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 61.0) internal successors, (366), 6 states have internal predecessors, (366), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 02:11:18,189 INFO L276 IsEmpty]: Start isEmpty. Operand 20518 states and 28436 transitions. [2021-11-07 02:11:18,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-07 02:11:18,200 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:11:18,200 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 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] [2021-11-07 02:11:18,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:18,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:18,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-07 02:11:18,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:18,801 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 2 more)] === [2021-11-07 02:11:18,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:11:18,802 INFO L85 PathProgramCache]: Analyzing trace with hash 1093157380, now seen corresponding path program 1 times [2021-11-07 02:11:18,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:11:18,803 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1391661065] [2021-11-07 02:11:18,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:18,803 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:11:18,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:11:18,804 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:11:18,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-07 02:11:22,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:22,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 1384 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:11:22,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:23,832 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-07 02:11:23,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:24,849 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-07 02:11:24,849 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:11:24,849 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1391661065] [2021-11-07 02:11:24,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1391661065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:24,850 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [157287316] [2021-11-07 02:11:24,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:24,850 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:11:24,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:11:24,852 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:11:24,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-07 02:11:30,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:30,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 1384 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:11:30,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:31,529 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 02:11:31,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:32,811 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 02:11:32,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [157287316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:32,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590122159] [2021-11-07 02:11:32,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:11:32,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:11:32,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:11:32,813 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:11:32,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d3f303a5-76a0-4c90-a122-f52dd120a07b/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-07 02:11:37,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:11:37,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 1384 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:11:37,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:11:39,175 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 02:11:39,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:11:40,342 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 02:11:40,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590122159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:11:40,342 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:11:40,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 14 [2021-11-07 02:11:40,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522314742] [2021-11-07 02:11:40,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 02:11:40,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:11:40,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 02:11:40,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:11:40,344 INFO L87 Difference]: Start difference. First operand 20518 states and 28436 transitions. Second operand has 14 states, 14 states have (on average 39.642857142857146) internal successors, (555), 14 states have internal predecessors, (555), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-07 02:12:13,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:12:13,317 INFO L93 Difference]: Finished difference Result 245932 states and 340931 transitions. [2021-11-07 02:12:13,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 02:12:13,318 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 39.642857142857146) internal successors, (555), 14 states have internal predecessors, (555), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 218 [2021-11-07 02:12:13,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:12:14,252 INFO L225 Difference]: With dead ends: 245932 [2021-11-07 02:12:14,252 INFO L226 Difference]: Without dead ends: 225432 [2021-11-07 02:12:14,342 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1294 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:12:14,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225432 states.