./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec1_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- 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_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/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_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/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 32bit --witnessprinter.graph.data.programhash ca4739abfecd00b8d2b799ccc2617c6e4b4e221f88b8a7e722070835771a8404 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:20:51,435 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:20:51,437 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:20:51,467 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:20:51,468 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:20:51,470 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:20:51,471 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:20:51,474 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:20:51,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:20:51,477 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:20:51,478 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:20:51,480 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:20:51,480 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:20:51,482 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:20:51,483 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:20:51,485 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:20:51,486 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:20:51,487 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:20:51,489 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:20:51,492 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:20:51,494 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:20:51,496 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:20:51,497 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:20:51,498 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:20:51,502 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:20:51,503 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:20:51,503 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:20:51,504 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:20:51,505 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:20:51,506 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:20:51,507 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:20:51,508 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:20:51,509 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:20:51,510 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:20:51,511 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:20:51,511 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:20:51,512 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:20:51,512 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:20:51,513 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:20:51,514 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:20:51,515 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:20:51,516 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:20:51,557 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:20:51,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:20:51,562 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:20:51,562 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:20:51,563 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:20:51,563 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:20:51,563 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:20:51,564 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:20:51,570 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:20:51,570 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:20:51,571 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:20:51,572 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:20:51,572 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:20:51,572 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:20:51,573 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:20:51,573 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:20:51,574 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:20:51,574 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:20:51,574 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:20:51,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:20:51,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:20:51,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:20:51,575 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:20:51,576 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:20:51,576 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:20:51,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:20:51,577 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:20:51,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:20:51,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:20:51,579 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:20:51,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:20:51,580 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:20:51,580 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:20:51,580 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:20:51,581 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:20:51,581 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:20:51,581 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:20:51,581 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:20:51,582 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:20:51,582 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_a1eda953-4f99-4033-a883-c617a4f34de5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca4739abfecd00b8d2b799ccc2617c6e4b4e221f88b8a7e722070835771a8404 [2021-11-07 02:20:51,842 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:20:51,867 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:20:51,869 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:20:51,870 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:20:51,871 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:20:51,872 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product31.cil.c [2021-11-07 02:20:51,960 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/fbed7d5cd/4a32589b80a5404dab67ffaf33acc0b4/FLAG2313c7d0d [2021-11-07 02:20:52,622 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:20:52,623 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c [2021-11-07 02:20:52,654 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/fbed7d5cd/4a32589b80a5404dab67ffaf33acc0b4/FLAG2313c7d0d [2021-11-07 02:20:52,817 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/fbed7d5cd/4a32589b80a5404dab67ffaf33acc0b4 [2021-11-07 02:20:52,820 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:20:52,821 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:20:52,823 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:20:52,823 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:20:52,826 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:20:52,827 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:20:52" (1/1) ... [2021-11-07 02:20:52,828 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b1d66d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:52, skipping insertion in model container [2021-11-07 02:20:52,828 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:20:52" (1/1) ... [2021-11-07 02:20:52,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:20:52,897 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:20:53,605 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_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c[64142,64155] [2021-11-07 02:20:53,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:20:53,620 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 02:20:53,621 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@44110432 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:53, skipping insertion in model container [2021-11-07 02:20:53,621 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:20:53,622 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:20:53,624 INFO L168 Benchmark]: Toolchain (without parser) took 801.41 ms. Allocated memory is still 107.0 MB. Free memory was 81.6 MB in the beginning and 69.2 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 02:20:53,625 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 107.0 MB. Free memory is still 63.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:20:53,625 INFO L168 Benchmark]: CACSL2BoogieTranslator took 799.24 ms. Allocated memory is still 107.0 MB. Free memory was 81.3 MB in the beginning and 69.2 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 02:20:53,627 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 107.0 MB. Free memory is still 63.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 799.24 ms. Allocated memory is still 107.0 MB. Free memory was 81.3 MB in the beginning and 69.2 MB in the end (delta: 12.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 518]: 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_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/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_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/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 32bit --witnessprinter.graph.data.programhash ca4739abfecd00b8d2b799ccc2617c6e4b4e221f88b8a7e722070835771a8404 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:20:55,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:20:55,907 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:20:55,939 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:20:55,939 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:20:55,941 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:20:55,942 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:20:55,945 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:20:55,947 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:20:55,948 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:20:55,950 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:20:55,951 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:20:55,952 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:20:55,953 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:20:55,955 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:20:55,956 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:20:55,958 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:20:55,959 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:20:55,961 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:20:55,963 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:20:55,965 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:20:55,967 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:20:55,969 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:20:55,970 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:20:55,973 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:20:55,974 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:20:55,974 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:20:55,975 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:20:55,976 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:20:55,977 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:20:55,978 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:20:55,979 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:20:55,979 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:20:55,980 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:20:55,982 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:20:55,982 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:20:55,983 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:20:55,983 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:20:55,997 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:20:55,998 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:20:55,999 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:20:56,001 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 02:20:56,051 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:20:56,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:20:56,053 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:20:56,053 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:20:56,053 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:20:56,054 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:20:56,054 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:20:56,054 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:20:56,054 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:20:56,056 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:20:56,057 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:20:56,057 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:20:56,057 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:20:56,058 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:20:56,059 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:20:56,059 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:20:56,059 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:20:56,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:20:56,060 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:20:56,060 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:20:56,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:20:56,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:20:56,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:20:56,061 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:20:56,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:20:56,061 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:20:56,061 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:20:56,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:20:56,062 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:20:56,062 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:20:56,062 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_a1eda953-4f99-4033-a883-c617a4f34de5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca4739abfecd00b8d2b799ccc2617c6e4b4e221f88b8a7e722070835771a8404 [2021-11-07 02:20:56,460 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:20:56,484 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:20:56,488 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:20:56,489 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:20:56,490 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:20:56,491 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product31.cil.c [2021-11-07 02:20:56,568 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/52ddc6e87/617520ab92304e3bb4f0e33ff3534cc1/FLAGd58052403 [2021-11-07 02:20:57,250 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:20:57,255 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c [2021-11-07 02:20:57,285 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/52ddc6e87/617520ab92304e3bb4f0e33ff3534cc1/FLAGd58052403 [2021-11-07 02:20:57,505 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/data/52ddc6e87/617520ab92304e3bb4f0e33ff3534cc1 [2021-11-07 02:20:57,511 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:20:57,513 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:20:57,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:20:57,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:20:57,520 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:20:57,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:20:57" (1/1) ... [2021-11-07 02:20:57,522 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c87b84 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:57, skipping insertion in model container [2021-11-07 02:20:57,522 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:20:57" (1/1) ... [2021-11-07 02:20:57,531 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:20:57,631 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:20:58,261 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_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c[64142,64155] [2021-11-07 02:20:58,264 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:20:58,279 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:20:58,300 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:20:58,445 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_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c[64142,64155] [2021-11-07 02:20:58,446 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:20:58,453 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:20:58,548 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_a1eda953-4f99-4033-a883-c617a4f34de5/sv-benchmarks/c/product-lines/email_spec1_product31.cil.c[64142,64155] [2021-11-07 02:20:58,548 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:20:58,609 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:20:58,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58 WrapperNode [2021-11-07 02:20:58,610 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:20:58,612 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:20:58,612 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:20:58,612 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:20:58,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,675 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,778 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:20:58,778 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:20:58,779 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:20:58,779 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:20:58,788 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,799 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,888 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,909 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,916 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:20:58,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:20:58,939 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:20:58,940 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:20:58,941 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (1/1) ... [2021-11-07 02:20:58,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:20:58,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:20:58,973 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:20:59,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:20:59,033 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 02:20:59,033 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:20:59,035 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:20:59,035 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:20:59,036 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:21:03,845 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:21:03,845 INFO L299 CfgBuilder]: Removed 375 assume(true) statements. [2021-11-07 02:21:03,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:21:03 BoogieIcfgContainer [2021-11-07 02:21:03,849 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:21:03,851 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:21:03,851 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:21:03,854 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:21:03,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:20:57" (1/3) ... [2021-11-07 02:21:03,855 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2da980c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:21:03, skipping insertion in model container [2021-11-07 02:21:03,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:20:58" (2/3) ... [2021-11-07 02:21:03,856 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2da980c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:21:03, skipping insertion in model container [2021-11-07 02:21:03,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:21:03" (3/3) ... [2021-11-07 02:21:03,858 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec1_product31.cil.c [2021-11-07 02:21:03,863 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:21:03,863 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 02:21:03,918 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:21:03,924 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 02:21:03,924 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 02:21:03,958 INFO L276 IsEmpty]: Start isEmpty. Operand has 565 states, 562 states have (on average 1.7366548042704626) internal successors, (976), 564 states have internal predecessors, (976), 0 states have call successors, (0), 0 states 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 02:21:03,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 02:21:03,985 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:03,986 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:03,987 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:03,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:03,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1593275253, now seen corresponding path program 1 times [2021-11-07 02:21:04,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:04,012 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1252263216] [2021-11-07 02:21:04,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:04,013 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:04,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:04,020 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:04,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:21:04,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:04,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 02:21:04,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:04,635 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 02:21:04,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:04,825 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 02:21:04,825 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:04,826 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1252263216] [2021-11-07 02:21:04,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1252263216] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:04,826 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:04,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:21:04,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999291267] [2021-11-07 02:21:04,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 02:21:04,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:04,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 02:21:04,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:21:04,867 INFO L87 Difference]: Start difference. First operand has 565 states, 562 states have (on average 1.7366548042704626) internal successors, (976), 564 states have internal predecessors, (976), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 22.5) 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 02:21:05,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:05,007 INFO L93 Difference]: Finished difference Result 888 states and 1511 transitions. [2021-11-07 02:21:05,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:21:05,008 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) 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 45 [2021-11-07 02:21:05,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:05,026 INFO L225 Difference]: With dead ends: 888 [2021-11-07 02:21:05,026 INFO L226 Difference]: Without dead ends: 453 [2021-11-07 02:21:05,032 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 88 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 02:21:05,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-11-07 02:21:05,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 453. [2021-11-07 02:21:05,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 451 states have (on average 1.7427937915742793) internal successors, (786), 452 states have internal predecessors, (786), 0 states have call successors, (0), 0 states 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 02:21:05,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 786 transitions. [2021-11-07 02:21:05,104 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 786 transitions. Word has length 45 [2021-11-07 02:21:05,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:05,105 INFO L470 AbstractCegarLoop]: Abstraction has 453 states and 786 transitions. [2021-11-07 02:21:05,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) 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 02:21:05,105 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 786 transitions. [2021-11-07 02:21:05,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 02:21:05,109 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:05,109 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:05,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:05,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:05,329 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:05,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:05,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1548486274, now seen corresponding path program 1 times [2021-11-07 02:21:05,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:05,331 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1354158812] [2021-11-07 02:21:05,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:05,332 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:05,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:05,333 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:05,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:21:05,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:05,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:21:05,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:05,932 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 02:21:05,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:06,106 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 02:21:06,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:06,107 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1354158812] [2021-11-07 02:21:06,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1354158812] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:06,107 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:06,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:21:06,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380299542] [2021-11-07 02:21:06,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:21:06,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:06,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:21:06,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:21:06,111 INFO L87 Difference]: Start difference. First operand 453 states and 786 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:06,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:06,340 INFO L93 Difference]: Finished difference Result 1329 states and 2310 transitions. [2021-11-07 02:21:06,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:21:06,341 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 02:21:06,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:06,349 INFO L225 Difference]: With dead ends: 1329 [2021-11-07 02:21:06,349 INFO L226 Difference]: Without dead ends: 891 [2021-11-07 02:21:06,351 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 88 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 02:21:06,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 891 states. [2021-11-07 02:21:06,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 891 to 452. [2021-11-07 02:21:06,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 450 states have (on average 1.7355555555555555) internal successors, (781), 451 states have internal predecessors, (781), 0 states have call successors, (0), 0 states 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 02:21:06,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 781 transitions. [2021-11-07 02:21:06,405 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 781 transitions. Word has length 46 [2021-11-07 02:21:06,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:06,407 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 781 transitions. [2021-11-07 02:21:06,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:06,408 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 781 transitions. [2021-11-07 02:21:06,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 02:21:06,418 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:06,419 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:06,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:06,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:06,635 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:06,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:06,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1841528872, now seen corresponding path program 1 times [2021-11-07 02:21:06,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:06,638 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [848003533] [2021-11-07 02:21:06,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:06,638 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:06,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:06,643 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:06,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:21:07,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:07,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:21:07,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:07,236 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 02:21:07,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:07,402 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 02:21:07,403 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:07,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [848003533] [2021-11-07 02:21:07,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [848003533] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:07,404 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:07,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:21:07,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198889177] [2021-11-07 02:21:07,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:21:07,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:07,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:21:07,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:21:07,409 INFO L87 Difference]: Start difference. First operand 452 states and 781 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:07,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:07,677 INFO L93 Difference]: Finished difference Result 1725 states and 2986 transitions. [2021-11-07 02:21:07,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:21:07,678 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 02:21:07,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:07,689 INFO L225 Difference]: With dead ends: 1725 [2021-11-07 02:21:07,689 INFO L226 Difference]: Without dead ends: 1291 [2021-11-07 02:21:07,690 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:21:07,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1291 states. [2021-11-07 02:21:07,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1291 to 451. [2021-11-07 02:21:07,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 449 states have (on average 1.730512249443207) internal successors, (777), 450 states have internal predecessors, (777), 0 states have call successors, (0), 0 states 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 02:21:07,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 777 transitions. [2021-11-07 02:21:07,743 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 777 transitions. Word has length 48 [2021-11-07 02:21:07,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:07,743 INFO L470 AbstractCegarLoop]: Abstraction has 451 states and 777 transitions. [2021-11-07 02:21:07,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:07,746 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 777 transitions. [2021-11-07 02:21:07,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 02:21:07,748 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:07,748 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:07,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:07,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:07,969 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:07,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:07,970 INFO L85 PathProgramCache]: Analyzing trace with hash -51860187, now seen corresponding path program 1 times [2021-11-07 02:21:07,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:07,971 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1991850850] [2021-11-07 02:21:07,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:07,971 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:07,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:07,975 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:07,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:21:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:08,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:21:08,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:08,560 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 02:21:08,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:08,687 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 02:21:08,687 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:08,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1991850850] [2021-11-07 02:21:08,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1991850850] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:08,689 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:08,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:21:08,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715419023] [2021-11-07 02:21:08,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:21:08,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:08,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:21:08,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:21:08,692 INFO L87 Difference]: Start difference. First operand 451 states and 777 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:08,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:08,765 INFO L93 Difference]: Finished difference Result 899 states and 1551 transitions. [2021-11-07 02:21:08,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:21:08,765 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 02:21:08,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:08,769 INFO L225 Difference]: With dead ends: 899 [2021-11-07 02:21:08,769 INFO L226 Difference]: Without dead ends: 456 [2021-11-07 02:21:08,770 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 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 02:21:08,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2021-11-07 02:21:08,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 451. [2021-11-07 02:21:08,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 449 states have (on average 1.7238307349665924) internal successors, (774), 450 states have internal predecessors, (774), 0 states have call successors, (0), 0 states 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 02:21:08,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 774 transitions. [2021-11-07 02:21:08,805 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 774 transitions. Word has length 49 [2021-11-07 02:21:08,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:08,806 INFO L470 AbstractCegarLoop]: Abstraction has 451 states and 774 transitions. [2021-11-07 02:21:08,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:08,806 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 774 transitions. [2021-11-07 02:21:08,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 02:21:08,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:08,808 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:08,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:09,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:09,028 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:09,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:09,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1748708848, now seen corresponding path program 1 times [2021-11-07 02:21:09,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:09,029 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1943749658] [2021-11-07 02:21:09,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:09,030 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:09,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:09,031 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:09,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:21:09,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:09,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:21:09,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:09,600 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 02:21:09,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:09,746 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 02:21:09,747 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:09,747 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1943749658] [2021-11-07 02:21:09,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1943749658] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:09,747 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:09,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:21:09,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892424459] [2021-11-07 02:21:09,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:21:09,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:09,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:21:09,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:21:09,749 INFO L87 Difference]: Start difference. First operand 451 states and 774 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:09,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:09,978 INFO L93 Difference]: Finished difference Result 1712 states and 2962 transitions. [2021-11-07 02:21:09,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:21:09,978 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 02:21:09,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:09,987 INFO L225 Difference]: With dead ends: 1712 [2021-11-07 02:21:09,987 INFO L226 Difference]: Without dead ends: 1287 [2021-11-07 02:21:09,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 02:21:09,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1287 states. [2021-11-07 02:21:10,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1287 to 451. [2021-11-07 02:21:10,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 449 states have (on average 1.7171492204899776) internal successors, (771), 450 states have internal predecessors, (771), 0 states have call successors, (0), 0 states 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 02:21:10,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 771 transitions. [2021-11-07 02:21:10,031 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 771 transitions. Word has length 50 [2021-11-07 02:21:10,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:10,031 INFO L470 AbstractCegarLoop]: Abstraction has 451 states and 771 transitions. [2021-11-07 02:21:10,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:10,031 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 771 transitions. [2021-11-07 02:21:10,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 02:21:10,032 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:10,033 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:10,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:10,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:10,253 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:10,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:10,253 INFO L85 PathProgramCache]: Analyzing trace with hash -100976939, now seen corresponding path program 1 times [2021-11-07 02:21:10,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:10,254 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [273921832] [2021-11-07 02:21:10,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:10,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:10,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:10,255 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:10,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 02:21:10,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:10,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:10,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:10,893 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 02:21:10,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:11,024 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 02:21:11,024 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:11,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [273921832] [2021-11-07 02:21:11,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [273921832] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:11,024 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:11,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:21:11,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503472188] [2021-11-07 02:21:11,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:21:11,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:11,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:21:11,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:21:11,026 INFO L87 Difference]: Start difference. First operand 451 states and 771 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:11,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:11,112 INFO L93 Difference]: Finished difference Result 1087 states and 1860 transitions. [2021-11-07 02:21:11,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:21:11,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 02:21:11,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:11,118 INFO L225 Difference]: With dead ends: 1087 [2021-11-07 02:21:11,118 INFO L226 Difference]: Without dead ends: 876 [2021-11-07 02:21:11,119 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 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 02:21:11,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 876 states. [2021-11-07 02:21:11,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 876 to 665. [2021-11-07 02:21:11,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 665 states, 663 states have (on average 1.7526395173453997) internal successors, (1162), 664 states have internal predecessors, (1162), 0 states have call successors, (0), 0 states 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 02:21:11,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 1162 transitions. [2021-11-07 02:21:11,172 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 1162 transitions. Word has length 52 [2021-11-07 02:21:11,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:11,172 INFO L470 AbstractCegarLoop]: Abstraction has 665 states and 1162 transitions. [2021-11-07 02:21:11,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:11,173 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 1162 transitions. [2021-11-07 02:21:11,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 02:21:11,174 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:11,174 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:11,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:11,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:11,395 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:11,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:11,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1944230948, now seen corresponding path program 1 times [2021-11-07 02:21:11,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:11,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [284489352] [2021-11-07 02:21:11,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:11,396 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:11,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:11,397 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:11,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:21:11,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:11,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:11,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:12,079 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 02:21:12,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:12,226 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 02:21:12,226 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:12,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [284489352] [2021-11-07 02:21:12,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [284489352] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:12,227 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:12,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:12,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375410880] [2021-11-07 02:21:12,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:12,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:12,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:12,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:12,228 INFO L87 Difference]: Start difference. First operand 665 states and 1162 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states 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 02:21:12,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:12,319 INFO L93 Difference]: Finished difference Result 1619 states and 2834 transitions. [2021-11-07 02:21:12,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:12,319 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 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 64 [2021-11-07 02:21:12,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:12,326 INFO L225 Difference]: With dead ends: 1619 [2021-11-07 02:21:12,326 INFO L226 Difference]: Without dead ends: 1038 [2021-11-07 02:21:12,328 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:12,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1038 states. [2021-11-07 02:21:12,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1038 to 827. [2021-11-07 02:21:12,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.7648484848484849) internal successors, (1456), 826 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states 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 02:21:12,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1456 transitions. [2021-11-07 02:21:12,394 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1456 transitions. Word has length 64 [2021-11-07 02:21:12,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:12,395 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1456 transitions. [2021-11-07 02:21:12,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states 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 02:21:12,395 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1456 transitions. [2021-11-07 02:21:12,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 02:21:12,397 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:12,397 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:12,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:12,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:12,611 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:12,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:12,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1948124123, now seen corresponding path program 1 times [2021-11-07 02:21:12,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:12,613 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1419760311] [2021-11-07 02:21:12,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:12,613 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:12,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:12,618 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:12,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:21:13,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:13,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:13,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:13,303 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 02:21:13,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:13,471 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 02:21:13,472 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:13,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1419760311] [2021-11-07 02:21:13,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1419760311] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:13,472 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:13,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:13,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950718322] [2021-11-07 02:21:13,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:13,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:13,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:13,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:13,474 INFO L87 Difference]: Start difference. First operand 827 states and 1456 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states 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 02:21:13,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:13,621 INFO L93 Difference]: Finished difference Result 2149 states and 3802 transitions. [2021-11-07 02:21:13,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:13,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 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 65 [2021-11-07 02:21:13,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:13,631 INFO L225 Difference]: With dead ends: 2149 [2021-11-07 02:21:13,632 INFO L226 Difference]: Without dead ends: 1410 [2021-11-07 02:21:13,635 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:13,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1410 states. [2021-11-07 02:21:13,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1410 to 1199. [2021-11-07 02:21:13,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1199 states, 1197 states have (on average 1.7827903091060986) internal successors, (2134), 1198 states have internal predecessors, (2134), 0 states have call successors, (0), 0 states 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 02:21:13,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1199 states to 1199 states and 2134 transitions. [2021-11-07 02:21:13,738 INFO L78 Accepts]: Start accepts. Automaton has 1199 states and 2134 transitions. Word has length 65 [2021-11-07 02:21:13,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:13,738 INFO L470 AbstractCegarLoop]: Abstraction has 1199 states and 2134 transitions. [2021-11-07 02:21:13,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states 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 02:21:13,739 INFO L276 IsEmpty]: Start isEmpty. Operand 1199 states and 2134 transitions. [2021-11-07 02:21:13,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 02:21:13,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:13,742 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:21:13,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:13,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:13,967 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:13,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:13,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1814762123, now seen corresponding path program 1 times [2021-11-07 02:21:13,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:13,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1232092008] [2021-11-07 02:21:13,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:13,969 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:13,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:13,970 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:13,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:21:14,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:14,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:14,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:14,656 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:14,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:14,815 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:14,815 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:14,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1232092008] [2021-11-07 02:21:14,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1232092008] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:14,816 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:14,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:21:14,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609137914] [2021-11-07 02:21:14,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:21:14,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:14,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:21:14,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:21:14,817 INFO L87 Difference]: Start difference. First operand 1199 states and 2134 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:14,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:14,941 INFO L93 Difference]: Finished difference Result 2363 states and 4190 transitions. [2021-11-07 02:21:14,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:14,942 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 02:21:14,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:14,951 INFO L225 Difference]: With dead ends: 2363 [2021-11-07 02:21:14,951 INFO L226 Difference]: Without dead ends: 1410 [2021-11-07 02:21:14,955 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 128 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 02:21:14,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1410 states. [2021-11-07 02:21:15,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1410 to 1199. [2021-11-07 02:21:15,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1199 states, 1197 states have (on average 1.7811194653299915) internal successors, (2132), 1198 states have internal predecessors, (2132), 0 states have call successors, (0), 0 states 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 02:21:15,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1199 states to 1199 states and 2132 transitions. [2021-11-07 02:21:15,098 INFO L78 Accepts]: Start accepts. Automaton has 1199 states and 2132 transitions. Word has length 66 [2021-11-07 02:21:15,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:15,101 INFO L470 AbstractCegarLoop]: Abstraction has 1199 states and 2132 transitions. [2021-11-07 02:21:15,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:15,101 INFO L276 IsEmpty]: Start isEmpty. Operand 1199 states and 2132 transitions. [2021-11-07 02:21:15,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 02:21:15,104 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:15,104 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:15,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:15,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:15,318 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:15,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:15,319 INFO L85 PathProgramCache]: Analyzing trace with hash -391154250, now seen corresponding path program 1 times [2021-11-07 02:21:15,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:15,319 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1397631719] [2021-11-07 02:21:15,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:15,320 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:15,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:15,321 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:15,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 02:21:15,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:15,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:15,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:16,005 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 02:21:16,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:16,166 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 02:21:16,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:16,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1397631719] [2021-11-07 02:21:16,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1397631719] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:16,167 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:16,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:16,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291838844] [2021-11-07 02:21:16,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:16,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:16,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:16,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:16,168 INFO L87 Difference]: Start difference. First operand 1199 states and 2132 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states 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 02:21:16,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:16,352 INFO L93 Difference]: Finished difference Result 3237 states and 5785 transitions. [2021-11-07 02:21:16,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:16,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 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 66 [2021-11-07 02:21:16,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:16,365 INFO L225 Difference]: With dead ends: 3237 [2021-11-07 02:21:16,366 INFO L226 Difference]: Without dead ends: 2134 [2021-11-07 02:21:16,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:16,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2134 states. [2021-11-07 02:21:16,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2134 to 1923. [2021-11-07 02:21:16,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1923 states, 1921 states have (on average 1.7964601769911503) internal successors, (3451), 1922 states have internal predecessors, (3451), 0 states have call successors, (0), 0 states 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 02:21:16,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1923 states to 1923 states and 3451 transitions. [2021-11-07 02:21:16,522 INFO L78 Accepts]: Start accepts. Automaton has 1923 states and 3451 transitions. Word has length 66 [2021-11-07 02:21:16,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:16,522 INFO L470 AbstractCegarLoop]: Abstraction has 1923 states and 3451 transitions. [2021-11-07 02:21:16,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states 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 02:21:16,523 INFO L276 IsEmpty]: Start isEmpty. Operand 1923 states and 3451 transitions. [2021-11-07 02:21:16,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 02:21:16,532 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:16,532 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:16,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:16,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:16,748 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:16,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:16,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1140845149, now seen corresponding path program 1 times [2021-11-07 02:21:16,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:16,749 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [872401883] [2021-11-07 02:21:16,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:16,750 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:16,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:16,751 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:16,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:21:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:17,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:17,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:17,566 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 02:21:17,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:17,722 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 02:21:17,722 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:17,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [872401883] [2021-11-07 02:21:17,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [872401883] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:17,722 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:17,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:17,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818768629] [2021-11-07 02:21:17,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:17,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:17,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:17,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:17,724 INFO L87 Difference]: Start difference. First operand 1923 states and 3451 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 02:21:17,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:17,998 INFO L93 Difference]: Finished difference Result 5145 states and 9261 transitions. [2021-11-07 02:21:17,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:17,998 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 67 [2021-11-07 02:21:17,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:18,022 INFO L225 Difference]: With dead ends: 5145 [2021-11-07 02:21:18,022 INFO L226 Difference]: Without dead ends: 3352 [2021-11-07 02:21:18,026 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:18,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3352 states. [2021-11-07 02:21:18,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3352 to 3141. [2021-11-07 02:21:18,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3141 states, 3139 states have (on average 1.8043963045555909) internal successors, (5664), 3140 states have internal predecessors, (5664), 0 states have call successors, (0), 0 states 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 02:21:18,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3141 states to 3141 states and 5664 transitions. [2021-11-07 02:21:18,315 INFO L78 Accepts]: Start accepts. Automaton has 3141 states and 5664 transitions. Word has length 67 [2021-11-07 02:21:18,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:18,316 INFO L470 AbstractCegarLoop]: Abstraction has 3141 states and 5664 transitions. [2021-11-07 02:21:18,317 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 02:21:18,317 INFO L276 IsEmpty]: Start isEmpty. Operand 3141 states and 5664 transitions. [2021-11-07 02:21:18,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 02:21:18,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:18,322 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:18,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:18,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:18,536 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:18,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:18,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1375971515, now seen corresponding path program 1 times [2021-11-07 02:21:18,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:18,538 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [652128474] [2021-11-07 02:21:18,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:18,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:18,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:18,539 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:18,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:21:19,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:19,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:19,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:19,228 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 02:21:19,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:19,400 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 02:21:19,400 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:19,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [652128474] [2021-11-07 02:21:19,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [652128474] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:19,400 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:19,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:19,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010356327] [2021-11-07 02:21:19,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:19,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:19,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:19,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:19,402 INFO L87 Difference]: Start difference. First operand 3141 states and 5664 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states 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 02:21:19,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:19,812 INFO L93 Difference]: Finished difference Result 8515 states and 15383 transitions. [2021-11-07 02:21:19,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:19,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 68 [2021-11-07 02:21:19,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:19,850 INFO L225 Difference]: With dead ends: 8515 [2021-11-07 02:21:19,851 INFO L226 Difference]: Without dead ends: 5538 [2021-11-07 02:21:19,855 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:19,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5538 states. [2021-11-07 02:21:20,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5538 to 5327. [2021-11-07 02:21:20,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5327 states, 5325 states have (on average 1.807511737089202) internal successors, (9625), 5326 states have internal predecessors, (9625), 0 states have call successors, (0), 0 states 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 02:21:20,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5327 states to 5327 states and 9625 transitions. [2021-11-07 02:21:20,344 INFO L78 Accepts]: Start accepts. Automaton has 5327 states and 9625 transitions. Word has length 68 [2021-11-07 02:21:20,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:20,344 INFO L470 AbstractCegarLoop]: Abstraction has 5327 states and 9625 transitions. [2021-11-07 02:21:20,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states 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 02:21:20,345 INFO L276 IsEmpty]: Start isEmpty. Operand 5327 states and 9625 transitions. [2021-11-07 02:21:20,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 02:21:20,353 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:20,353 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:20,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:20,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:20,568 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:20,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:20,569 INFO L85 PathProgramCache]: Analyzing trace with hash -205423967, now seen corresponding path program 1 times [2021-11-07 02:21:20,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:20,570 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1900377043] [2021-11-07 02:21:20,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:20,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:20,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:20,571 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:20,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:21:21,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:21,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:21:21,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:21,351 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:21:21,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 02:21:21,603 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:21,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1900377043] [2021-11-07 02:21:21,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1900377043] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:21,603 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:21,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:21:21,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101034175] [2021-11-07 02:21:21,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:21:21,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:21,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:21:21,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:21:21,605 INFO L87 Difference]: Start difference. First operand 5327 states and 9625 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:24,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:24,862 INFO L93 Difference]: Finished difference Result 19948 states and 36081 transitions. [2021-11-07 02:21:24,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:21:24,863 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 02:21:24,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:24,936 INFO L225 Difference]: With dead ends: 19948 [2021-11-07 02:21:24,936 INFO L226 Difference]: Without dead ends: 14865 [2021-11-07 02:21:24,945 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:21:24,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14865 states. [2021-11-07 02:21:25,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14865 to 5277. [2021-11-07 02:21:25,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5277 states, 5275 states have (on average 1.7867298578199051) internal successors, (9425), 5276 states have internal predecessors, (9425), 0 states have call successors, (0), 0 states 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 02:21:25,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5277 states to 5277 states and 9425 transitions. [2021-11-07 02:21:25,572 INFO L78 Accepts]: Start accepts. Automaton has 5277 states and 9425 transitions. Word has length 69 [2021-11-07 02:21:25,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:25,573 INFO L470 AbstractCegarLoop]: Abstraction has 5277 states and 9425 transitions. [2021-11-07 02:21:25,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:25,574 INFO L276 IsEmpty]: Start isEmpty. Operand 5277 states and 9425 transitions. [2021-11-07 02:21:25,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 02:21:25,579 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:25,579 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 02:21:25,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:25,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:25,794 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:25,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:25,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1519776494, now seen corresponding path program 1 times [2021-11-07 02:21:25,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:25,795 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [803468019] [2021-11-07 02:21:25,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:25,795 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:25,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:25,797 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:25,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:21:26,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:26,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:26,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:26,762 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 02:21:26,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:27,005 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 02:21:27,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:27,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [803468019] [2021-11-07 02:21:27,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [803468019] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:27,006 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:27,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:21:27,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111028851] [2021-11-07 02:21:27,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:27,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:27,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:27,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:27,008 INFO L87 Difference]: Start difference. First operand 5277 states and 9425 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states 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 02:21:27,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:27,580 INFO L93 Difference]: Finished difference Result 15252 states and 27289 transitions. [2021-11-07 02:21:27,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:27,581 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 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 02:21:27,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:27,611 INFO L225 Difference]: With dead ends: 15252 [2021-11-07 02:21:27,611 INFO L226 Difference]: Without dead ends: 10146 [2021-11-07 02:21:27,620 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:21:27,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10146 states. [2021-11-07 02:21:28,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10146 to 9935. [2021-11-07 02:21:28,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9935 states, 9933 states have (on average 1.7881808114366253) internal successors, (17762), 9934 states have internal predecessors, (17762), 0 states have call successors, (0), 0 states 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 02:21:28,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9935 states to 9935 states and 17762 transitions. [2021-11-07 02:21:28,378 INFO L78 Accepts]: Start accepts. Automaton has 9935 states and 17762 transitions. Word has length 69 [2021-11-07 02:21:28,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:28,378 INFO L470 AbstractCegarLoop]: Abstraction has 9935 states and 17762 transitions. [2021-11-07 02:21:28,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states 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 02:21:28,379 INFO L276 IsEmpty]: Start isEmpty. Operand 9935 states and 17762 transitions. [2021-11-07 02:21:28,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 02:21:28,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:28,387 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:28,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:28,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:28,603 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:28,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:28,603 INFO L85 PathProgramCache]: Analyzing trace with hash 833019270, now seen corresponding path program 1 times [2021-11-07 02:21:28,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:28,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [749269870] [2021-11-07 02:21:28,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:28,605 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:28,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:28,606 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:28,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:21:29,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:29,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:21:29,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:29,580 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:29,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:29,840 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:29,840 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:29,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [749269870] [2021-11-07 02:21:29,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [749269870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:21:29,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [365424627] [2021-11-07 02:21:29,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:29,841 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:29,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:21:29,849 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:21:29,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:21:30,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:30,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:21:30,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:30,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:30,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:31,269 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:31,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [365424627] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:31,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:21:31,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 02:21:31,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681579356] [2021-11-07 02:21:31,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:21:31,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:31,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:21:31,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:21:31,272 INFO L87 Difference]: Start difference. First operand 9935 states and 17762 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states 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 02:21:31,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:31,927 INFO L93 Difference]: Finished difference Result 10090 states and 18016 transitions. [2021-11-07 02:21:31,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:21:31,928 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 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 70 [2021-11-07 02:21:31,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:31,958 INFO L225 Difference]: With dead ends: 10090 [2021-11-07 02:21:31,959 INFO L226 Difference]: Without dead ends: 9929 [2021-11-07 02:21:31,964 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:21:31,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9929 states. [2021-11-07 02:21:32,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9929 to 9929. [2021-11-07 02:21:32,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9929 states, 9928 states have (on average 1.7881748589846898) internal successors, (17753), 9928 states have internal predecessors, (17753), 0 states have call successors, (0), 0 states 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 02:21:32,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9929 states to 9929 states and 17753 transitions. [2021-11-07 02:21:32,691 INFO L78 Accepts]: Start accepts. Automaton has 9929 states and 17753 transitions. Word has length 70 [2021-11-07 02:21:32,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:32,692 INFO L470 AbstractCegarLoop]: Abstraction has 9929 states and 17753 transitions. [2021-11-07 02:21:32,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states 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 02:21:32,692 INFO L276 IsEmpty]: Start isEmpty. Operand 9929 states and 17753 transitions. [2021-11-07 02:21:32,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-07 02:21:32,714 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:32,714 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:32,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:32,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:33,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:33,119 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:33,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:33,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1908850176, now seen corresponding path program 1 times [2021-11-07 02:21:33,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:33,120 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1056885048] [2021-11-07 02:21:33,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:33,120 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:33,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:33,121 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:33,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 02:21:33,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:33,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:21:33,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:34,196 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:34,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:34,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:34,502 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:34,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1056885048] [2021-11-07 02:21:34,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1056885048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:21:34,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [186249617] [2021-11-07 02:21:34,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:34,503 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:34,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:21:34,505 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:21:34,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 02:21:35,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:35,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:21:35,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:35,784 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:35,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:36,143 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:36,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [186249617] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:36,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:21:36,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 02:21:36,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389182389] [2021-11-07 02:21:36,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:21:36,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:36,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:21:36,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:21:36,146 INFO L87 Difference]: Start difference. First operand 9929 states and 17753 transitions. Second operand has 10 states, 10 states have (on average 14.5) internal successors, (145), 10 states have internal predecessors, (145), 0 states have call successors, (0), 0 states 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 02:21:43,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:43,939 INFO L93 Difference]: Finished difference Result 59756 states and 107247 transitions. [2021-11-07 02:21:43,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:21:43,940 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.5) internal successors, (145), 10 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2021-11-07 02:21:43,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:44,262 INFO L225 Difference]: With dead ends: 59756 [2021-11-07 02:21:44,262 INFO L226 Difference]: Without dead ends: 59569 [2021-11-07 02:21:44,275 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 02:21:44,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59569 states. [2021-11-07 02:21:46,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59569 to 19806. [2021-11-07 02:21:46,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19806 states, 19805 states have (on average 1.7884372633173442) internal successors, (35420), 19805 states have internal predecessors, (35420), 0 states have call successors, (0), 0 states 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 02:21:46,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19806 states to 19806 states and 35420 transitions. [2021-11-07 02:21:46,166 INFO L78 Accepts]: Start accepts. Automaton has 19806 states and 35420 transitions. Word has length 110 [2021-11-07 02:21:46,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:46,167 INFO L470 AbstractCegarLoop]: Abstraction has 19806 states and 35420 transitions. [2021-11-07 02:21:46,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.5) internal successors, (145), 10 states have internal predecessors, (145), 0 states have call successors, (0), 0 states 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 02:21:46,167 INFO L276 IsEmpty]: Start isEmpty. Operand 19806 states and 35420 transitions. [2021-11-07 02:21:46,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 02:21:46,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:46,251 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:46,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:46,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:46,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:46,669 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:46,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:46,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1062163603, now seen corresponding path program 1 times [2021-11-07 02:21:46,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:46,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1234946917] [2021-11-07 02:21:46,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:46,671 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:46,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:46,672 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:46,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:21:47,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:47,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:21:47,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:47,805 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:47,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:48,049 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:48,049 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:48,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1234946917] [2021-11-07 02:21:48,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1234946917] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:48,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:21:48,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 02:21:48,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068210272] [2021-11-07 02:21:48,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:21:48,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:48,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:21:48,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:21:48,052 INFO L87 Difference]: Start difference. First operand 19806 states and 35420 transitions. Second operand has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:49,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:49,141 INFO L93 Difference]: Finished difference Result 38694 states and 69424 transitions. [2021-11-07 02:21:49,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:21:49,142 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-07 02:21:49,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:49,197 INFO L225 Difference]: With dead ends: 38694 [2021-11-07 02:21:49,197 INFO L226 Difference]: Without dead ends: 19135 [2021-11-07 02:21:49,224 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 02:21:49,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19135 states. [2021-11-07 02:21:50,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19135 to 9931. [2021-11-07 02:21:50,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9931 states, 9930 states have (on average 1.7877139979859014) internal successors, (17752), 9930 states have internal predecessors, (17752), 0 states have call successors, (0), 0 states 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 02:21:50,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9931 states to 9931 states and 17752 transitions. [2021-11-07 02:21:50,188 INFO L78 Accepts]: Start accepts. Automaton has 9931 states and 17752 transitions. Word has length 111 [2021-11-07 02:21:50,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:50,189 INFO L470 AbstractCegarLoop]: Abstraction has 9931 states and 17752 transitions. [2021-11-07 02:21:50,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:50,189 INFO L276 IsEmpty]: Start isEmpty. Operand 9931 states and 17752 transitions. [2021-11-07 02:21:50,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 02:21:50,209 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:50,209 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:50,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:50,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:21:50,424 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:50,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:50,424 INFO L85 PathProgramCache]: Analyzing trace with hash -2112140095, now seen corresponding path program 1 times [2021-11-07 02:21:50,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:50,425 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1542386001] [2021-11-07 02:21:50,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:50,425 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:50,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:50,426 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:50,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 02:21:51,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:51,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:21:51,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:51,597 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:51,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:51,897 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:51,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1542386001] [2021-11-07 02:21:51,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1542386001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:21:51,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [698574781] [2021-11-07 02:21:51,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:51,898 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:51,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:21:51,899 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:21:51,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 02:21:53,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:53,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:21:53,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:53,363 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:53,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:53,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:21:53,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [698574781] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:21:53,649 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:21:53,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 02:21:53,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216604593] [2021-11-07 02:21:53,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:21:53,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:21:53,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:21:53,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:21:53,651 INFO L87 Difference]: Start difference. First operand 9931 states and 17752 transitions. Second operand has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:56,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:21:56,423 INFO L93 Difference]: Finished difference Result 10268 states and 18305 transitions. [2021-11-07 02:21:56,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:21:56,432 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 02:21:56,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:21:56,450 INFO L225 Difference]: With dead ends: 10268 [2021-11-07 02:21:56,450 INFO L226 Difference]: Without dead ends: 10070 [2021-11-07 02:21:56,455 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:21:56,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10070 states. [2021-11-07 02:21:57,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10070 to 9927. [2021-11-07 02:21:57,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9927 states, 9926 states have (on average 1.7876284505339513) internal successors, (17744), 9926 states have internal predecessors, (17744), 0 states have call successors, (0), 0 states 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 02:21:57,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9927 states to 9927 states and 17744 transitions. [2021-11-07 02:21:57,214 INFO L78 Accepts]: Start accepts. Automaton has 9927 states and 17744 transitions. Word has length 112 [2021-11-07 02:21:57,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:21:57,214 INFO L470 AbstractCegarLoop]: Abstraction has 9927 states and 17744 transitions. [2021-11-07 02:21:57,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 5 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:21:57,215 INFO L276 IsEmpty]: Start isEmpty. Operand 9927 states and 17744 transitions. [2021-11-07 02:21:57,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 02:21:57,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:21:57,234 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:21:57,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:57,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:21:57,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:57,648 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:21:57,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:21:57,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1652530159, now seen corresponding path program 1 times [2021-11-07 02:21:57,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:21:57,649 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2076946498] [2021-11-07 02:21:57,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:57,649 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:21:57,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:21:57,650 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:21:57,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:21:58,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:21:58,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:21:58,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:21:58,903 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:58,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:21:59,177 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:21:59,177 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:21:59,177 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2076946498] [2021-11-07 02:21:59,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2076946498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:21:59,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [315646557] [2021-11-07 02:21:59,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:21:59,178 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:21:59,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:21:59,179 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:21:59,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 02:22:00,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:00,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:22:00,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:01,192 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:01,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:01,744 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:01,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [315646557] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:22:01,744 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:22:01,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:22:01,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119857021] [2021-11-07 02:22:01,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:22:01,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:22:01,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:22:01,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:22:01,747 INFO L87 Difference]: Start difference. First operand 9927 states and 17744 transitions. Second operand has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states 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 02:22:20,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:22:20,896 INFO L93 Difference]: Finished difference Result 21738 states and 38449 transitions. [2021-11-07 02:22:20,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:22:20,897 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-07 02:22:20,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:22:20,923 INFO L225 Difference]: With dead ends: 21738 [2021-11-07 02:22:20,923 INFO L226 Difference]: Without dead ends: 21562 [2021-11-07 02:22:20,927 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 02:22:20,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21562 states. [2021-11-07 02:22:22,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21562 to 19772. [2021-11-07 02:22:22,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19772 states, 19771 states have (on average 1.7884274948156391) internal successors, (35359), 19771 states have internal predecessors, (35359), 0 states have call successors, (0), 0 states 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 02:22:22,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19772 states to 19772 states and 35359 transitions. [2021-11-07 02:22:22,179 INFO L78 Accepts]: Start accepts. Automaton has 19772 states and 35359 transitions. Word has length 114 [2021-11-07 02:22:22,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:22:22,179 INFO L470 AbstractCegarLoop]: Abstraction has 19772 states and 35359 transitions. [2021-11-07 02:22:22,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states 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 02:22:22,180 INFO L276 IsEmpty]: Start isEmpty. Operand 19772 states and 35359 transitions. [2021-11-07 02:22:22,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-07 02:22:22,201 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:22:22,201 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:22:22,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:22,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:22,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:22:22,608 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:22:22,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:22:22,608 INFO L85 PathProgramCache]: Analyzing trace with hash -93504221, now seen corresponding path program 1 times [2021-11-07 02:22:22,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:22:22,609 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1457398397] [2021-11-07 02:22:22,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:22,609 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:22:22,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:22:22,610 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:22:22,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 02:22:23,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:23,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:22:23,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:23,920 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:23,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:24,304 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:24,304 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:22:24,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1457398397] [2021-11-07 02:22:24,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1457398397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:22:24,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1130066408] [2021-11-07 02:22:24,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:24,305 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:22:24,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:22:24,312 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:22:24,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 02:22:25,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:25,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:22:25,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:25,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:25,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:26,143 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:26,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1130066408] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:22:26,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:22:26,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 02:22:26,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252515445] [2021-11-07 02:22:26,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:22:26,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:22:26,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:22:26,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 02:22:26,145 INFO L87 Difference]: Start difference. First operand 19772 states and 35359 transitions. Second operand has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 states have internal predecessors, (109), 0 states have call successors, (0), 0 states 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 02:22:27,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:22:27,158 INFO L93 Difference]: Finished difference Result 20172 states and 35992 transitions. [2021-11-07 02:22:27,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:22:27,158 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-07 02:22:27,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:22:27,187 INFO L225 Difference]: With dead ends: 20172 [2021-11-07 02:22:27,187 INFO L226 Difference]: Without dead ends: 19803 [2021-11-07 02:22:27,193 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:22:27,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19803 states. [2021-11-07 02:22:28,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19803 to 19659. [2021-11-07 02:22:28,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19659 states, 19658 states have (on average 1.7888900193305524) internal successors, (35166), 19658 states have internal predecessors, (35166), 0 states have call successors, (0), 0 states 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 02:22:28,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19659 states to 19659 states and 35166 transitions. [2021-11-07 02:22:28,709 INFO L78 Accepts]: Start accepts. Automaton has 19659 states and 35166 transitions. Word has length 115 [2021-11-07 02:22:28,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:22:28,709 INFO L470 AbstractCegarLoop]: Abstraction has 19659 states and 35166 transitions. [2021-11-07 02:22:28,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.25) internal successors, (109), 4 states have internal predecessors, (109), 0 states have call successors, (0), 0 states 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 02:22:28,710 INFO L276 IsEmpty]: Start isEmpty. Operand 19659 states and 35166 transitions. [2021-11-07 02:22:28,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 02:22:28,733 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:22:28,734 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:22:28,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:28,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:29,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:22:29,140 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:22:29,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:22:29,141 INFO L85 PathProgramCache]: Analyzing trace with hash -1752283335, now seen corresponding path program 1 times [2021-11-07 02:22:29,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:22:29,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [530496084] [2021-11-07 02:22:29,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:29,141 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:22:29,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:22:29,142 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:22:29,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 02:22:30,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:30,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:22:30,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:30,534 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:30,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:30,889 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:30,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:22:30,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [530496084] [2021-11-07 02:22:30,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [530496084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:22:30,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1928860629] [2021-11-07 02:22:30,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:30,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:22:30,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:22:30,891 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:22:30,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 02:22:32,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:32,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:22:32,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:32,799 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:32,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:33,129 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:33,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1928860629] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:22:33,130 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:22:33,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 02:22:33,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320340412] [2021-11-07 02:22:33,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:22:33,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:22:33,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:22:33,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:22:33,132 INFO L87 Difference]: Start difference. First operand 19659 states and 35166 transitions. Second operand has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:22:36,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:22:36,463 INFO L93 Difference]: Finished difference Result 20154 states and 35959 transitions. [2021-11-07 02:22:36,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:22:36,464 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 02:22:36,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:22:36,487 INFO L225 Difference]: With dead ends: 20154 [2021-11-07 02:22:36,487 INFO L226 Difference]: Without dead ends: 19820 [2021-11-07 02:22:36,491 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:22:36,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19820 states. [2021-11-07 02:22:37,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19820 to 19647. [2021-11-07 02:22:37,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19647 states, 19646 states have (on average 1.788608368115647) internal successors, (35139), 19646 states have internal predecessors, (35139), 0 states have call successors, (0), 0 states 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 02:22:37,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19647 states to 19647 states and 35139 transitions. [2021-11-07 02:22:37,646 INFO L78 Accepts]: Start accepts. Automaton has 19647 states and 35139 transitions. Word has length 116 [2021-11-07 02:22:37,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:22:37,646 INFO L470 AbstractCegarLoop]: Abstraction has 19647 states and 35139 transitions. [2021-11-07 02:22:37,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:22:37,646 INFO L276 IsEmpty]: Start isEmpty. Operand 19647 states and 35139 transitions. [2021-11-07 02:22:37,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 02:22:37,669 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:22:37,670 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:22:37,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:37,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:22:38,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:22:38,084 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:22:38,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:22:38,085 INFO L85 PathProgramCache]: Analyzing trace with hash 1019177313, now seen corresponding path program 1 times [2021-11-07 02:22:38,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:22:38,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2088651093] [2021-11-07 02:22:38,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:38,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:22:38,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:22:38,087 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:22:38,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 02:22:39,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:39,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:22:39,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:39,548 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:39,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:39,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:22:39,859 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:22:39,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2088651093] [2021-11-07 02:22:39,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2088651093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:22:39,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [903317543] [2021-11-07 02:22:39,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:22:39,860 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:22:39,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:22:39,861 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:22:39,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 02:22:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:22:41,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:22:41,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:22:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:42,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:22:42,844 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:22:42,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [903317543] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:22:42,844 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:22:42,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:22:42,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708298711] [2021-11-07 02:22:42,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:22:42,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:22:42,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:22:42,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:22:42,847 INFO L87 Difference]: Start difference. First operand 19647 states and 35139 transitions. Second operand has 16 states, 16 states have (on average 10.375) internal successors, (166), 15 states have internal predecessors, (166), 0 states have call successors, (0), 0 states 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 02:22:58,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:22:58,959 INFO L93 Difference]: Finished difference Result 41938 states and 74391 transitions. [2021-11-07 02:22:58,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 02:22:58,959 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.375) internal successors, (166), 15 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 02:22:58,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:22:59,021 INFO L225 Difference]: With dead ends: 41938 [2021-11-07 02:22:59,021 INFO L226 Difference]: Without dead ends: 41616 [2021-11-07 02:22:59,030 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 440 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=501, Invalid=1479, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 02:22:59,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41616 states. [2021-11-07 02:23:01,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41616 to 39020. [2021-11-07 02:23:01,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39020 states, 39019 states have (on average 1.7893590302160487) internal successors, (69819), 39019 states have internal predecessors, (69819), 0 states have call successors, (0), 0 states 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 02:23:01,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39020 states to 39020 states and 69819 transitions. [2021-11-07 02:23:01,529 INFO L78 Accepts]: Start accepts. Automaton has 39020 states and 69819 transitions. Word has length 116 [2021-11-07 02:23:01,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:01,529 INFO L470 AbstractCegarLoop]: Abstraction has 39020 states and 69819 transitions. [2021-11-07 02:23:01,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.375) internal successors, (166), 15 states have internal predecessors, (166), 0 states have call successors, (0), 0 states 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 02:23:01,529 INFO L276 IsEmpty]: Start isEmpty. Operand 39020 states and 69819 transitions. [2021-11-07 02:23:01,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 02:23:01,583 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:01,583 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:23:01,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:01,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:02,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:02,002 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:23:02,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:02,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1889004573, now seen corresponding path program 1 times [2021-11-07 02:23:02,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:02,003 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2137250882] [2021-11-07 02:23:02,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:02,003 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:02,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:02,004 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:02,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 02:23:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:03,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:03,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:03,592 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:03,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:03,878 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:03,879 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:03,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2137250882] [2021-11-07 02:23:03,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2137250882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:03,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [635071989] [2021-11-07 02:23:03,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:03,879 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:03,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:03,880 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:03,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 02:23:05,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:05,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 02:23:05,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:06,085 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:06,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:06,595 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:06,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [635071989] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:06,595 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:23:06,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-07 02:23:06,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093397144] [2021-11-07 02:23:06,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 02:23:06,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:06,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 02:23:06,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:23:06,597 INFO L87 Difference]: Start difference. First operand 39020 states and 69819 transitions. Second operand has 14 states, 14 states have (on average 12.285714285714286) internal successors, (172), 14 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 02:23:15,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:15,470 INFO L93 Difference]: Finished difference Result 44876 states and 79011 transitions. [2021-11-07 02:23:15,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:23:15,470 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 12.285714285714286) internal successors, (172), 14 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 116 [2021-11-07 02:23:15,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:15,533 INFO L225 Difference]: With dead ends: 44876 [2021-11-07 02:23:15,533 INFO L226 Difference]: Without dead ends: 44361 [2021-11-07 02:23:15,542 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 443 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=570, Invalid=1782, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 02:23:15,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44361 states. [2021-11-07 02:23:18,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44361 to 39040. [2021-11-07 02:23:18,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39040 states, 39039 states have (on average 1.7889546351084813) internal successors, (69839), 39039 states have internal predecessors, (69839), 0 states have call successors, (0), 0 states 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 02:23:18,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39040 states to 39040 states and 69839 transitions. [2021-11-07 02:23:18,097 INFO L78 Accepts]: Start accepts. Automaton has 39040 states and 69839 transitions. Word has length 116 [2021-11-07 02:23:18,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:18,098 INFO L470 AbstractCegarLoop]: Abstraction has 39040 states and 69839 transitions. [2021-11-07 02:23:18,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 12.285714285714286) internal successors, (172), 14 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 02:23:18,098 INFO L276 IsEmpty]: Start isEmpty. Operand 39040 states and 69839 transitions. [2021-11-07 02:23:18,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 02:23:18,133 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:18,133 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:23:18,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:18,348 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-07 02:23:18,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:18,534 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:23:18,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:18,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1773564725, now seen corresponding path program 1 times [2021-11-07 02:23:18,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:18,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [891284088] [2021-11-07 02:23:18,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:18,548 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:18,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:18,549 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:18,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 02:23:19,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:19,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:19,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:20,246 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:20,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:20,549 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:20,549 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:20,549 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [891284088] [2021-11-07 02:23:20,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [891284088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:20,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1441836438] [2021-11-07 02:23:20,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:20,550 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:20,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:20,551 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:20,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 02:23:22,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:22,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:23:22,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:22,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:22,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:23,207 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:23,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1441836438] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:23,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:23:23,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 02:23:23,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084004410] [2021-11-07 02:23:23,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:23:23,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:23,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:23:23,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:23:23,209 INFO L87 Difference]: Start difference. First operand 39040 states and 69839 transitions. Second operand has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:26,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:26,966 INFO L93 Difference]: Finished difference Result 42272 states and 74959 transitions. [2021-11-07 02:23:26,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:23:26,967 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-07 02:23:26,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:27,025 INFO L225 Difference]: With dead ends: 42272 [2021-11-07 02:23:27,026 INFO L226 Difference]: Without dead ends: 41857 [2021-11-07 02:23:27,032 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 02:23:27,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41857 states. [2021-11-07 02:23:29,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41857 to 39456. [2021-11-07 02:23:29,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39456 states, 39455 states have (on average 1.7871245722975542) internal successors, (70511), 39455 states have internal predecessors, (70511), 0 states have call successors, (0), 0 states 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 02:23:29,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39456 states to 39456 states and 70511 transitions. [2021-11-07 02:23:29,868 INFO L78 Accepts]: Start accepts. Automaton has 39456 states and 70511 transitions. Word has length 117 [2021-11-07 02:23:29,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:29,868 INFO L470 AbstractCegarLoop]: Abstraction has 39456 states and 70511 transitions. [2021-11-07 02:23:29,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 22.2) internal successors, (111), 4 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:23:29,869 INFO L276 IsEmpty]: Start isEmpty. Operand 39456 states and 70511 transitions. [2021-11-07 02:23:29,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 02:23:29,910 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:29,910 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:23:29,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:30,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-07 02:23:30,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:23:30,311 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:23:30,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:30,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1901475929, now seen corresponding path program 1 times [2021-11-07 02:23:30,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:30,312 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [327437545] [2021-11-07 02:23:30,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:30,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:30,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:30,313 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:30,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 02:23:31,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:31,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:31,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:32,117 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:32,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:32,428 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:32,428 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:32,428 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [327437545] [2021-11-07 02:23:32,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [327437545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:32,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1727214194] [2021-11-07 02:23:32,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:32,429 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:32,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:32,430 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:32,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 02:23:34,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:34,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:23:34,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:34,940 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:34,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:35,179 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:35,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1727214194] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:35,179 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:23:35,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 15 [2021-11-07 02:23:35,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160224026] [2021-11-07 02:23:35,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:23:35,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:35,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:23:35,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-07 02:23:35,181 INFO L87 Difference]: Start difference. First operand 39456 states and 70511 transitions. Second operand has 9 states, 9 states have (on average 13.11111111111111) internal successors, (118), 9 states have internal predecessors, (118), 0 states have call successors, (0), 0 states 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 02:23:38,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:23:38,545 INFO L93 Difference]: Finished difference Result 41442 states and 73623 transitions. [2021-11-07 02:23:38,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:23:38,545 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 13.11111111111111) internal successors, (118), 9 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-07 02:23:38,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:23:38,598 INFO L225 Difference]: With dead ends: 41442 [2021-11-07 02:23:38,598 INFO L226 Difference]: Without dead ends: 41059 [2021-11-07 02:23:38,604 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:23:38,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41059 states. [2021-11-07 02:23:41,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41059 to 39472. [2021-11-07 02:23:41,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39472 states, 39471 states have (on average 1.7868055027741887) internal successors, (70527), 39471 states have internal predecessors, (70527), 0 states have call successors, (0), 0 states 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 02:23:41,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39472 states to 39472 states and 70527 transitions. [2021-11-07 02:23:41,191 INFO L78 Accepts]: Start accepts. Automaton has 39472 states and 70527 transitions. Word has length 118 [2021-11-07 02:23:41,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:23:41,192 INFO L470 AbstractCegarLoop]: Abstraction has 39472 states and 70527 transitions. [2021-11-07 02:23:41,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 13.11111111111111) internal successors, (118), 9 states have internal predecessors, (118), 0 states have call successors, (0), 0 states 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 02:23:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 39472 states and 70527 transitions. [2021-11-07 02:23:41,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 02:23:41,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:23:41,233 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 02:23:41,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 02:23:41,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-07 02:23:41,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:41,636 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:23:41,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:23:41,636 INFO L85 PathProgramCache]: Analyzing trace with hash 571513346, now seen corresponding path program 1 times [2021-11-07 02:23:41,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:23:41,637 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [419401006] [2021-11-07 02:23:41,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:41,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:23:41,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:23:41,638 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:23:41,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 02:23:43,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:43,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:23:43,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:43,511 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:43,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:43,812 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:23:43,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:23:43,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [419401006] [2021-11-07 02:23:43,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [419401006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:23:43,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [875032600] [2021-11-07 02:23:43,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:23:43,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:23:43,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:23:43,813 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:23:43,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1eda953-4f99-4033-a883-c617a4f34de5/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 02:23:46,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:23:46,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 649 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 02:23:46,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:23:46,413 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:46,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:23:46,701 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:23:46,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [875032600] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:23:46,702 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:23:46,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 16 [2021-11-07 02:23:46,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149005866] [2021-11-07 02:23:46,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:23:46,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:23:46,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:23:46,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:23:46,704 INFO L87 Difference]: Start difference. First operand 39472 states and 70527 transitions. Second operand has 10 states, 10 states have (on average 11.2) internal successors, (112), 10 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)