./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec4_product28.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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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 619b5b07f7bee6d460265c38ff6f46d0f3c88b87f6fc28a24021d9529c74e42f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:09:13,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:09:13,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:09:13,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:09:13,482 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:09:13,487 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:09:13,490 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:09:13,494 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:09:13,497 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:09:13,506 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:09:13,508 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:09:13,510 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:09:13,510 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:09:13,514 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:09:13,517 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:09:13,523 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:09:13,525 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:09:13,526 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:09:13,533 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:09:13,536 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:09:13,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:09:13,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:09:13,546 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:09:13,548 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:09:13,558 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:09:13,559 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:09:13,559 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:09:13,562 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:09:13,562 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:09:13,564 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:09:13,565 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:09:13,566 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:09:13,569 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:09:13,570 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:09:13,572 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:09:13,572 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:09:13,573 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:09:13,574 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:09:13,574 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:09:13,575 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:09:13,576 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:09:13,577 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:09:13,641 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:09:13,642 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:09:13,643 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:09:13,643 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:09:13,643 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:09:13,644 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:09:13,644 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:09:13,644 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:09:13,644 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:09:13,645 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:09:13,645 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:09:13,645 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:09:13,646 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:09:13,646 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:09:13,646 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:09:13,647 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:09:13,647 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:09:13,648 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:09:13,648 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:09:13,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:09:13,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:09:13,649 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:09:13,649 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:09:13,649 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:09:13,649 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:09:13,650 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:09:13,650 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:09:13,650 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:09:13,651 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:09:13,651 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:09:13,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:09:13,652 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:09:13,652 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:09:13,652 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:09:13,652 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:09:13,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:09:13,666 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:09:13,666 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:09:13,666 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:09:13,667 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 619b5b07f7bee6d460265c38ff6f46d0f3c88b87f6fc28a24021d9529c74e42f [2021-11-07 01:09:13,932 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:09:13,958 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:09:13,961 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:09:13,962 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:09:13,963 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:09:13,964 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product28.cil.c [2021-11-07 01:09:14,033 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/73d912b7c/eb59181522c541bb86ed2bd52c5ff6f1/FLAG518123d05 [2021-11-07 01:09:14,771 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:09:14,773 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c [2021-11-07 01:09:14,812 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/73d912b7c/eb59181522c541bb86ed2bd52c5ff6f1/FLAG518123d05 [2021-11-07 01:09:14,902 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/73d912b7c/eb59181522c541bb86ed2bd52c5ff6f1 [2021-11-07 01:09:14,904 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:09:14,905 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:09:14,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:09:14,907 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:09:14,923 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:09:14,924 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:09:14" (1/1) ... [2021-11-07 01:09:14,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17ebc780 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:14, skipping insertion in model container [2021-11-07 01:09:14,925 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:09:14" (1/1) ... [2021-11-07 01:09:14,933 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:09:15,000 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:09:15,339 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c[8467,8480] [2021-11-07 01:09:15,735 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:09:15,749 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 01:09:15,750 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@15247344 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:15, skipping insertion in model container [2021-11-07 01:09:15,750 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:09:15,751 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:09:15,753 INFO L168 Benchmark]: Toolchain (without parser) took 846.46 ms. Allocated memory is still 86.0 MB. Free memory was 59.3 MB in the beginning and 48.0 MB in the end (delta: 11.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 01:09:15,754 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 86.0 MB. Free memory was 59.4 MB in the beginning and 59.3 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:09:15,755 INFO L168 Benchmark]: CACSL2BoogieTranslator took 843.77 ms. Allocated memory is still 86.0 MB. Free memory was 59.0 MB in the beginning and 48.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 01:09:15,757 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 86.0 MB. Free memory was 59.4 MB in the beginning and 59.3 MB in the end (delta: 70.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 843.77 ms. Allocated memory is still 86.0 MB. Free memory was 59.0 MB in the beginning and 48.2 MB in the end (delta: 10.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 2624]: 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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 619b5b07f7bee6d460265c38ff6f46d0f3c88b87f6fc28a24021d9529c74e42f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:09:18,366 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:09:18,370 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:09:18,414 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:09:18,415 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:09:18,421 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:09:18,423 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:09:18,432 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:09:18,435 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:09:18,445 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:09:18,446 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:09:18,448 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:09:18,449 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:09:18,452 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:09:18,454 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:09:18,455 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:09:18,461 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:09:18,462 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:09:18,464 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:09:18,469 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:09:18,474 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:09:18,475 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:09:18,478 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:09:18,481 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:09:18,488 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:09:18,489 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:09:18,489 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:09:18,492 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:09:18,492 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:09:18,494 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:09:18,495 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:09:18,496 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:09:18,498 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:09:18,499 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:09:18,501 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:09:18,501 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:09:18,514 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:09:18,514 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:09:18,515 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:09:18,517 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:09:18,518 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:09:18,523 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:09:18,582 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:09:18,582 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:09:18,584 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:09:18,584 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:09:18,585 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:09:18,585 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:09:18,585 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:09:18,586 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:09:18,586 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:09:18,588 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:09:18,589 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:09:18,589 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:09:18,590 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:09:18,590 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:09:18,590 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:09:18,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:09:18,591 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:09:18,591 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:09:18,591 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:09:18,592 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:09:18,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:09:18,592 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:09:18,593 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:09:18,593 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:09:18,593 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:09:18,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:09:18,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:09:18,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:09:18,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:09:18,595 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:09:18,595 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:09:18,595 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:18,596 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:09:18,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:09:18,596 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:09:18,597 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 619b5b07f7bee6d460265c38ff6f46d0f3c88b87f6fc28a24021d9529c74e42f [2021-11-07 01:09:19,053 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:09:19,079 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:09:19,083 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:09:19,085 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:09:19,086 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:09:19,089 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product28.cil.c [2021-11-07 01:09:19,175 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/5322482e3/9822e45d30724daa8344c9cf16882354/FLAGe39e1ba26 [2021-11-07 01:09:19,806 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:09:19,808 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c [2021-11-07 01:09:19,847 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/5322482e3/9822e45d30724daa8344c9cf16882354/FLAGe39e1ba26 [2021-11-07 01:09:20,018 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/data/5322482e3/9822e45d30724daa8344c9cf16882354 [2021-11-07 01:09:20,021 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:09:20,022 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:09:20,024 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:09:20,024 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:09:20,029 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:09:20,035 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:09:20" (1/1) ... [2021-11-07 01:09:20,036 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@97d623 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:20, skipping insertion in model container [2021-11-07 01:09:20,036 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:09:20" (1/1) ... [2021-11-07 01:09:20,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:09:20,156 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:09:20,548 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c[8467,8480] [2021-11-07 01:09:20,930 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:09:20,946 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:09:20,966 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:09:20,985 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c[8467,8480] [2021-11-07 01:09:21,106 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:09:21,119 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:09:21,140 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_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/sv-benchmarks/c/product-lines/email_spec4_product28.cil.c[8467,8480] [2021-11-07 01:09:21,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:09:21,248 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:09:21,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21 WrapperNode [2021-11-07 01:09:21,249 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:09:21,250 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:09:21,250 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:09:21,250 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:09:21,258 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,328 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,462 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:09:21,463 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:09:21,464 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:09:21,464 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:09:21,474 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,474 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,498 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,499 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,587 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,630 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,648 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:09:21,649 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:09:21,649 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:09:21,650 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:09:21,651 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (1/1) ... [2021-11-07 01:09:21,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:09:21,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:09:21,688 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:09:21,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:09:21,742 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:09:21,742 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:09:21,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:09:21,743 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:09:21,743 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:09:26,567 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:09:26,568 INFO L299 CfgBuilder]: Removed 291 assume(true) statements. [2021-11-07 01:09:26,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:09:26 BoogieIcfgContainer [2021-11-07 01:09:26,571 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:09:26,573 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:09:26,573 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:09:26,576 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:09:26,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:09:20" (1/3) ... [2021-11-07 01:09:26,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129069e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:09:26, skipping insertion in model container [2021-11-07 01:09:26,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:09:21" (2/3) ... [2021-11-07 01:09:26,578 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@129069e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:09:26, skipping insertion in model container [2021-11-07 01:09:26,579 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:09:26" (3/3) ... [2021-11-07 01:09:26,580 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec4_product28.cil.c [2021-11-07 01:09:26,586 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:09:26,586 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:09:26,644 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:09:26,651 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 01:09:26,651 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:09:26,680 INFO L276 IsEmpty]: Start isEmpty. Operand has 477 states, 474 states have (on average 1.7658227848101267) internal successors, (837), 476 states have internal predecessors, (837), 0 states have call successors, (0), 0 states 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 01:09:26,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 01:09:26,696 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:26,697 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] [2021-11-07 01:09:26,697 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:26,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:26,704 INFO L85 PathProgramCache]: Analyzing trace with hash 27139076, now seen corresponding path program 1 times [2021-11-07 01:09:26,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:26,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1998824321] [2021-11-07 01:09:26,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:26,722 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:26,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:26,726 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:26,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:09:27,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:27,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:09:27,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:27,448 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 01:09:27,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:27,582 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 01:09:27,583 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:27,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1998824321] [2021-11-07 01:09:27,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1998824321] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:27,584 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:27,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:09:27,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672791098] [2021-11-07 01:09:27,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:09:27,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:27,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:09:27,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:09:27,613 INFO L87 Difference]: Start difference. First operand has 477 states, 474 states have (on average 1.7658227848101267) internal successors, (837), 476 states have internal predecessors, (837), 0 states have call successors, (0), 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 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:27,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:27,674 INFO L93 Difference]: Finished difference Result 716 states and 1240 transitions. [2021-11-07 01:09:27,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:09:27,675 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 01:09:27,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:27,693 INFO L225 Difference]: With dead ends: 716 [2021-11-07 01:09:27,694 INFO L226 Difference]: Without dead ends: 411 [2021-11-07 01:09:27,698 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 92 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 01:09:27,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-11-07 01:09:27,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 411. [2021-11-07 01:09:27,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 409 states have (on average 1.7603911980440097) internal successors, (720), 410 states have internal predecessors, (720), 0 states have call successors, (0), 0 states 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 01:09:27,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 720 transitions. [2021-11-07 01:09:27,778 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 720 transitions. Word has length 47 [2021-11-07 01:09:27,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:27,779 INFO L470 AbstractCegarLoop]: Abstraction has 411 states and 720 transitions. [2021-11-07 01:09:27,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 23.5) internal successors, (47), 2 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:27,779 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 720 transitions. [2021-11-07 01:09:27,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 01:09:27,788 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:27,788 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 01:09:27,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:27,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:27,989 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:27,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:27,990 INFO L85 PathProgramCache]: Analyzing trace with hash -253757256, now seen corresponding path program 1 times [2021-11-07 01:09:27,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:27,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [957054217] [2021-11-07 01:09:27,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:27,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:27,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:27,994 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:28,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:09:28,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:28,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:09:28,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:28,633 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 01:09:28,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:28,808 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 01:09:28,808 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:28,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [957054217] [2021-11-07 01:09:28,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [957054217] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:28,809 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:28,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:09:28,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067112762] [2021-11-07 01:09:28,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:28,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:28,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:28,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:09:28,817 INFO L87 Difference]: Start difference. First operand 411 states and 720 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:29,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:29,001 INFO L93 Difference]: Finished difference Result 1203 states and 2112 transitions. [2021-11-07 01:09:29,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:29,002 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 01:09:29,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:29,014 INFO L225 Difference]: With dead ends: 1203 [2021-11-07 01:09:29,015 INFO L226 Difference]: Without dead ends: 807 [2021-11-07 01:09:29,021 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 92 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 01:09:29,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2021-11-07 01:09:29,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 410. [2021-11-07 01:09:29,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 408 states have (on average 1.7524509803921569) internal successors, (715), 409 states have internal predecessors, (715), 0 states have call successors, (0), 0 states 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 01:09:29,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 715 transitions. [2021-11-07 01:09:29,102 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 715 transitions. Word has length 48 [2021-11-07 01:09:29,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:29,104 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 715 transitions. [2021-11-07 01:09:29,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:29,104 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 715 transitions. [2021-11-07 01:09:29,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 01:09:29,120 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:29,121 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 01:09:29,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:29,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:29,342 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:29,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:29,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1600147602, now seen corresponding path program 1 times [2021-11-07 01:09:29,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:29,344 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1380707193] [2021-11-07 01:09:29,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:29,345 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:29,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:29,347 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:29,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:09:29,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:29,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:09:29,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:30,073 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 01:09:30,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:30,292 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 01:09:30,292 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:30,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1380707193] [2021-11-07 01:09:30,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1380707193] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:30,293 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:30,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:09:30,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803255417] [2021-11-07 01:09:30,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:09:30,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:30,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:09:30,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:09:30,303 INFO L87 Difference]: Start difference. First operand 410 states and 715 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 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 01:09:30,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:30,581 INFO L93 Difference]: Finished difference Result 1557 states and 2722 transitions. [2021-11-07 01:09:30,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:09:30,581 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 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 50 [2021-11-07 01:09:30,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:30,593 INFO L225 Difference]: With dead ends: 1557 [2021-11-07 01:09:30,594 INFO L226 Difference]: Without dead ends: 1165 [2021-11-07 01:09:30,595 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 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 01:09:30,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1165 states. [2021-11-07 01:09:30,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1165 to 409. [2021-11-07 01:09:30,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 407 states have (on average 1.746928746928747) internal successors, (711), 408 states have internal predecessors, (711), 0 states have call successors, (0), 0 states 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 01:09:30,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 711 transitions. [2021-11-07 01:09:30,634 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 711 transitions. Word has length 50 [2021-11-07 01:09:30,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:30,635 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 711 transitions. [2021-11-07 01:09:30,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 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 01:09:30,637 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 711 transitions. [2021-11-07 01:09:30,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:09:30,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:30,640 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] [2021-11-07 01:09:30,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:30,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:30,857 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:30,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:30,858 INFO L85 PathProgramCache]: Analyzing trace with hash -810131809, now seen corresponding path program 1 times [2021-11-07 01:09:30,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:30,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2135780330] [2021-11-07 01:09:30,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:30,864 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:30,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:30,866 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:30,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:09:31,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:31,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:09:31,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:31,578 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 01:09:31,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:31,754 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 01:09:31,755 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:31,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2135780330] [2021-11-07 01:09:31,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2135780330] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:31,756 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:31,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:09:31,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692557687] [2021-11-07 01:09:31,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:31,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:31,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:31,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:09:31,762 INFO L87 Difference]: Start difference. First operand 409 states and 711 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:31,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:31,844 INFO L93 Difference]: Finished difference Result 815 states and 1419 transitions. [2021-11-07 01:09:31,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:31,845 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:09:31,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:31,849 INFO L225 Difference]: With dead ends: 815 [2021-11-07 01:09:31,849 INFO L226 Difference]: Without dead ends: 414 [2021-11-07 01:09:31,850 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 98 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 01:09:31,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-11-07 01:09:31,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 409. [2021-11-07 01:09:31,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 407 states have (on average 1.7395577395577395) internal successors, (708), 408 states have internal predecessors, (708), 0 states have call successors, (0), 0 states 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 01:09:31,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 708 transitions. [2021-11-07 01:09:31,887 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 708 transitions. Word has length 51 [2021-11-07 01:09:31,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:31,888 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 708 transitions. [2021-11-07 01:09:31,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:31,888 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 708 transitions. [2021-11-07 01:09:31,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:09:31,890 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:31,890 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 01:09:31,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:32,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:32,108 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:32,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:32,108 INFO L85 PathProgramCache]: Analyzing trace with hash -1335109462, now seen corresponding path program 1 times [2021-11-07 01:09:32,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:32,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183822843] [2021-11-07 01:09:32,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:32,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:32,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:32,112 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:32,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:09:32,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:32,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:09:32,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:32,810 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 01:09:32,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:32,972 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 01:09:32,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:32,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183822843] [2021-11-07 01:09:32,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183822843] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:32,973 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:32,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:09:32,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445615859] [2021-11-07 01:09:32,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:09:32,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:32,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:09:32,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:09:32,975 INFO L87 Difference]: Start difference. First operand 409 states and 708 transitions. Second operand has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states 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 01:09:33,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:33,196 INFO L93 Difference]: Finished difference Result 1544 states and 2698 transitions. [2021-11-07 01:09:33,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:09:33,196 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 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 01:09:33,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:33,204 INFO L225 Difference]: With dead ends: 1544 [2021-11-07 01:09:33,204 INFO L226 Difference]: Without dead ends: 1161 [2021-11-07 01:09:33,205 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 98 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 01:09:33,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1161 states. [2021-11-07 01:09:33,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1161 to 409. [2021-11-07 01:09:33,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 407 states have (on average 1.7321867321867321) internal successors, (705), 408 states have internal predecessors, (705), 0 states have call successors, (0), 0 states 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 01:09:33,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 705 transitions. [2021-11-07 01:09:33,241 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 705 transitions. Word has length 52 [2021-11-07 01:09:33,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:33,241 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 705 transitions. [2021-11-07 01:09:33,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states 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 01:09:33,242 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 705 transitions. [2021-11-07 01:09:33,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:09:33,243 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:33,243 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] [2021-11-07 01:09:33,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:33,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:33,458 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:33,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:33,458 INFO L85 PathProgramCache]: Analyzing trace with hash -766690225, now seen corresponding path program 1 times [2021-11-07 01:09:33,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:33,460 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116442034] [2021-11-07 01:09:33,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:33,460 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:33,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:33,461 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:33,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:09:33,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:33,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:33,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:34,075 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 01:09:34,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:34,209 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 01:09:34,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:34,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116442034] [2021-11-07 01:09:34,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116442034] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:34,210 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:34,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:09:34,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659857016] [2021-11-07 01:09:34,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:34,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:34,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:34,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:09:34,211 INFO L87 Difference]: Start difference. First operand 409 states and 705 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states 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 01:09:34,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:34,291 INFO L93 Difference]: Finished difference Result 965 states and 1669 transitions. [2021-11-07 01:09:34,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:34,291 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-07 01:09:34,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:34,297 INFO L225 Difference]: With dead ends: 965 [2021-11-07 01:09:34,297 INFO L226 Difference]: Without dead ends: 792 [2021-11-07 01:09:34,298 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 104 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 01:09:34,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2021-11-07 01:09:34,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 619. [2021-11-07 01:09:34,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 617 states have (on average 1.7649918962722853) internal successors, (1089), 618 states have internal predecessors, (1089), 0 states have call successors, (0), 0 states 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 01:09:34,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 1089 transitions. [2021-11-07 01:09:34,356 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 1089 transitions. Word has length 54 [2021-11-07 01:09:34,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:34,357 INFO L470 AbstractCegarLoop]: Abstraction has 619 states and 1089 transitions. [2021-11-07 01:09:34,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states 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 01:09:34,357 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 1089 transitions. [2021-11-07 01:09:34,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 01:09:34,359 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:34,359 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 01:09:34,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:34,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:34,573 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:34,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:34,578 INFO L85 PathProgramCache]: Analyzing trace with hash -923288898, now seen corresponding path program 1 times [2021-11-07 01:09:34,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:34,579 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1930198238] [2021-11-07 01:09:34,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:34,579 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:34,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:34,580 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:34,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:09:35,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:35,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:35,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:35,304 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 01:09:35,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:35,477 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 01:09:35,477 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:35,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1930198238] [2021-11-07 01:09:35,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1930198238] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:35,478 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:35,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:35,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259493584] [2021-11-07 01:09:35,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:35,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:35,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:35,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:35,480 INFO L87 Difference]: Start difference. First operand 619 states and 1089 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 01:09:35,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:35,599 INFO L93 Difference]: Finished difference Result 1485 states and 2622 transitions. [2021-11-07 01:09:35,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:35,600 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 01:09:35,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:35,607 INFO L225 Difference]: With dead ends: 1485 [2021-11-07 01:09:35,607 INFO L226 Difference]: Without dead ends: 950 [2021-11-07 01:09:35,610 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 01:09:35,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 950 states. [2021-11-07 01:09:35,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 950 to 777. [2021-11-07 01:09:35,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 777 states, 775 states have (on average 1.7754838709677419) internal successors, (1376), 776 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states 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 01:09:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 777 states to 777 states and 1376 transitions. [2021-11-07 01:09:35,685 INFO L78 Accepts]: Start accepts. Automaton has 777 states and 1376 transitions. Word has length 66 [2021-11-07 01:09:35,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:35,687 INFO L470 AbstractCegarLoop]: Abstraction has 777 states and 1376 transitions. [2021-11-07 01:09:35,688 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 01:09:35,688 INFO L276 IsEmpty]: Start isEmpty. Operand 777 states and 1376 transitions. [2021-11-07 01:09:35,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:09:35,691 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:35,691 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 01:09:35,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:35,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:35,908 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:35,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:35,908 INFO L85 PathProgramCache]: Analyzing trace with hash -559997313, now seen corresponding path program 1 times [2021-11-07 01:09:35,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:35,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [135248551] [2021-11-07 01:09:35,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:35,910 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:35,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:35,915 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:35,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:09:36,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:36,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:36,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:36,672 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 01:09:36,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:36,830 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 01:09:36,830 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:36,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [135248551] [2021-11-07 01:09:36,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [135248551] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:36,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:36,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:36,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819925247] [2021-11-07 01:09:36,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:36,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:36,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:36,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:36,832 INFO L87 Difference]: Start difference. First operand 777 states and 1376 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 01:09:36,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:36,948 INFO L93 Difference]: Finished difference Result 2003 states and 3569 transitions. [2021-11-07 01:09:36,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:36,949 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 01:09:36,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:36,958 INFO L225 Difference]: With dead ends: 2003 [2021-11-07 01:09:36,959 INFO L226 Difference]: Without dead ends: 1314 [2021-11-07 01:09:36,960 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 01:09:36,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1314 states. [2021-11-07 01:09:37,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1314 to 1141. [2021-11-07 01:09:37,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1141 states, 1139 states have (on average 1.791044776119403) internal successors, (2040), 1140 states have internal predecessors, (2040), 0 states have call successors, (0), 0 states 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 01:09:37,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1141 states to 1141 states and 2040 transitions. [2021-11-07 01:09:37,072 INFO L78 Accepts]: Start accepts. Automaton has 1141 states and 2040 transitions. Word has length 67 [2021-11-07 01:09:37,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:37,073 INFO L470 AbstractCegarLoop]: Abstraction has 1141 states and 2040 transitions. [2021-11-07 01:09:37,073 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 01:09:37,074 INFO L276 IsEmpty]: Start isEmpty. Operand 1141 states and 2040 transitions. [2021-11-07 01:09:37,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:09:37,077 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:37,077 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, 1, 1] [2021-11-07 01:09:37,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:37,294 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:37,294 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:37,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:37,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1553189615, now seen corresponding path program 1 times [2021-11-07 01:09:37,295 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:37,295 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2029257191] [2021-11-07 01:09:37,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:37,296 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:37,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:37,297 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:37,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:09:37,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:37,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:37,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:37,965 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 01:09:37,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:38,126 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 01:09:38,127 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:38,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2029257191] [2021-11-07 01:09:38,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2029257191] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:38,127 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:38,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:09:38,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19894525] [2021-11-07 01:09:38,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:38,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:38,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:38,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:09:38,129 INFO L87 Difference]: Start difference. First operand 1141 states and 2040 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:38,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:38,244 INFO L93 Difference]: Finished difference Result 2213 states and 3950 transitions. [2021-11-07 01:09:38,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:38,245 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:09:38,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:38,264 INFO L225 Difference]: With dead ends: 2213 [2021-11-07 01:09:38,264 INFO L226 Difference]: Without dead ends: 1314 [2021-11-07 01:09:38,268 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 132 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 01:09:38,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1314 states. [2021-11-07 01:09:38,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1314 to 1141. [2021-11-07 01:09:38,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1141 states, 1139 states have (on average 1.7892888498683055) internal successors, (2038), 1140 states have internal predecessors, (2038), 0 states have call successors, (0), 0 states 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 01:09:38,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1141 states to 1141 states and 2038 transitions. [2021-11-07 01:09:38,371 INFO L78 Accepts]: Start accepts. Automaton has 1141 states and 2038 transitions. Word has length 68 [2021-11-07 01:09:38,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:38,372 INFO L470 AbstractCegarLoop]: Abstraction has 1141 states and 2038 transitions. [2021-11-07 01:09:38,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:38,372 INFO L276 IsEmpty]: Start isEmpty. Operand 1141 states and 2038 transitions. [2021-11-07 01:09:38,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:09:38,375 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:38,376 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 01:09:38,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:38,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:38,590 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:38,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:38,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1039431632, now seen corresponding path program 1 times [2021-11-07 01:09:38,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:38,590 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1353202377] [2021-11-07 01:09:38,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:38,591 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:38,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:38,592 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:38,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:09:39,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:39,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:39,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:39,341 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 01:09:39,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:39,512 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 01:09:39,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:39,513 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1353202377] [2021-11-07 01:09:39,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1353202377] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:39,513 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:39,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:39,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734492936] [2021-11-07 01:09:39,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:39,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:39,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:39,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:39,515 INFO L87 Difference]: Start difference. First operand 1141 states and 2038 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 01:09:39,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:39,743 INFO L93 Difference]: Finished difference Result 3067 states and 5510 transitions. [2021-11-07 01:09:39,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:39,744 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 01:09:39,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:39,759 INFO L225 Difference]: With dead ends: 3067 [2021-11-07 01:09:39,760 INFO L226 Difference]: Without dead ends: 2022 [2021-11-07 01:09:39,762 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 01:09:39,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2022 states. [2021-11-07 01:09:39,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2022 to 1849. [2021-11-07 01:09:39,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1849 states, 1847 states have (on average 1.8023822414726585) internal successors, (3329), 1848 states have internal predecessors, (3329), 0 states have call successors, (0), 0 states 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 01:09:39,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1849 states to 1849 states and 3329 transitions. [2021-11-07 01:09:39,966 INFO L78 Accepts]: Start accepts. Automaton has 1849 states and 3329 transitions. Word has length 68 [2021-11-07 01:09:39,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:39,967 INFO L470 AbstractCegarLoop]: Abstraction has 1849 states and 3329 transitions. [2021-11-07 01:09:39,967 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 01:09:39,967 INFO L276 IsEmpty]: Start isEmpty. Operand 1849 states and 3329 transitions. [2021-11-07 01:09:39,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:09:39,978 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:39,979 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 01:09:39,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:40,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:40,196 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:40,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:40,197 INFO L85 PathProgramCache]: Analyzing trace with hash 2140983421, now seen corresponding path program 1 times [2021-11-07 01:09:40,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:40,197 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1364400343] [2021-11-07 01:09:40,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:40,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:40,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:40,199 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:40,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:09:40,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:40,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:40,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:41,025 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 01:09:41,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:41,226 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 01:09:41,227 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:41,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1364400343] [2021-11-07 01:09:41,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1364400343] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:41,227 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:41,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:41,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908185991] [2021-11-07 01:09:41,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:41,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:41,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:41,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:41,229 INFO L87 Difference]: Start difference. First operand 1849 states and 3329 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 01:09:41,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:41,497 INFO L93 Difference]: Finished difference Result 4927 states and 8902 transitions. [2021-11-07 01:09:41,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:41,497 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 01:09:41,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:41,523 INFO L225 Difference]: With dead ends: 4927 [2021-11-07 01:09:41,523 INFO L226 Difference]: Without dead ends: 3208 [2021-11-07 01:09:41,527 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 01:09:41,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3208 states. [2021-11-07 01:09:41,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3208 to 3035. [2021-11-07 01:09:41,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 3033 states have (on average 1.808770194526871) internal successors, (5486), 3034 states have internal predecessors, (5486), 0 states have call successors, (0), 0 states 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 01:09:41,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5486 transitions. [2021-11-07 01:09:41,868 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5486 transitions. Word has length 69 [2021-11-07 01:09:41,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:41,869 INFO L470 AbstractCegarLoop]: Abstraction has 3035 states and 5486 transitions. [2021-11-07 01:09:41,869 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 01:09:41,870 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5486 transitions. [2021-11-07 01:09:41,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:09:41,875 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:41,875 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, 1] [2021-11-07 01:09:41,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:42,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:42,092 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:42,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:42,092 INFO L85 PathProgramCache]: Analyzing trace with hash -477154913, now seen corresponding path program 1 times [2021-11-07 01:09:42,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:42,093 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [247328814] [2021-11-07 01:09:42,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:42,093 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:42,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:42,094 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:42,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:09:42,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:42,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:42,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:42,976 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 01:09:42,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:43,159 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 01:09:43,159 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:43,160 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [247328814] [2021-11-07 01:09:43,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [247328814] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:43,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:43,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:43,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872916246] [2021-11-07 01:09:43,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:43,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:43,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:43,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:43,161 INFO L87 Difference]: Start difference. First operand 3035 states and 5486 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states 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 01:09:43,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:43,598 INFO L93 Difference]: Finished difference Result 8201 states and 14856 transitions. [2021-11-07 01:09:43,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:43,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 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 01:09:43,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:43,632 INFO L225 Difference]: With dead ends: 8201 [2021-11-07 01:09:43,632 INFO L226 Difference]: Without dead ends: 5330 [2021-11-07 01:09:43,637 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 137 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 01:09:43,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5330 states. [2021-11-07 01:09:44,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5330 to 5157. [2021-11-07 01:09:44,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5157 states, 5155 states have (on average 1.8108632395732298) internal successors, (9335), 5156 states have internal predecessors, (9335), 0 states have call successors, (0), 0 states 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 01:09:44,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5157 states to 5157 states and 9335 transitions. [2021-11-07 01:09:44,113 INFO L78 Accepts]: Start accepts. Automaton has 5157 states and 9335 transitions. Word has length 70 [2021-11-07 01:09:44,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:44,113 INFO L470 AbstractCegarLoop]: Abstraction has 5157 states and 9335 transitions. [2021-11-07 01:09:44,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states 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 01:09:44,114 INFO L276 IsEmpty]: Start isEmpty. Operand 5157 states and 9335 transitions. [2021-11-07 01:09:44,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:09:44,121 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:44,122 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] [2021-11-07 01:09:44,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:44,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:44,343 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:44,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:44,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1938930971, now seen corresponding path program 1 times [2021-11-07 01:09:44,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:44,344 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1500142390] [2021-11-07 01:09:44,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:44,345 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:44,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:44,346 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:44,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:09:44,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:44,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:44,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:45,167 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 01:09:45,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:45,406 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 01:09:45,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:45,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1500142390] [2021-11-07 01:09:45,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1500142390] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:45,407 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:45,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:09:45,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766717404] [2021-11-07 01:09:45,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:09:45,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:45,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:09:45,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:09:45,409 INFO L87 Difference]: Start difference. First operand 5157 states and 9335 transitions. Second operand has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states 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 01:09:48,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:48,843 INFO L93 Difference]: Finished difference Result 19280 states and 34942 transitions. [2021-11-07 01:09:48,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:09:48,844 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 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 71 [2021-11-07 01:09:48,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:48,918 INFO L225 Difference]: With dead ends: 19280 [2021-11-07 01:09:48,919 INFO L226 Difference]: Without dead ends: 14363 [2021-11-07 01:09:48,929 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 136 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 01:09:48,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14363 states. [2021-11-07 01:09:49,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14363 to 5107. [2021-11-07 01:09:49,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5107 states, 5105 states have (on average 1.7894221351616062) internal successors, (9135), 5106 states have internal predecessors, (9135), 0 states have call successors, (0), 0 states 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 01:09:49,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5107 states to 5107 states and 9135 transitions. [2021-11-07 01:09:49,635 INFO L78 Accepts]: Start accepts. Automaton has 5107 states and 9135 transitions. Word has length 71 [2021-11-07 01:09:49,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:49,635 INFO L470 AbstractCegarLoop]: Abstraction has 5107 states and 9135 transitions. [2021-11-07 01:09:49,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.5) internal successors, (93), 6 states have internal predecessors, (93), 0 states have call successors, (0), 0 states 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 01:09:49,637 INFO L276 IsEmpty]: Start isEmpty. Operand 5107 states and 9135 transitions. [2021-11-07 01:09:49,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:09:49,645 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:49,646 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, 1, 1] [2021-11-07 01:09:49,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:49,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:49,862 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:49,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:49,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1234786260, now seen corresponding path program 1 times [2021-11-07 01:09:49,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:49,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2054466511] [2021-11-07 01:09:49,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:49,863 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:49,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:49,865 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:49,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:09:50,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:50,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:50,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:50,937 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 01:09:50,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:51,158 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 01:09:51,158 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:51,158 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2054466511] [2021-11-07 01:09:51,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2054466511] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:51,159 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:09:51,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:09:51,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088818242] [2021-11-07 01:09:51,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:51,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:51,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:51,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:09:51,161 INFO L87 Difference]: Start difference. First operand 5107 states and 9135 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 01:09:51,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:51,978 INFO L93 Difference]: Finished difference Result 14878 states and 26657 transitions. [2021-11-07 01:09:51,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:51,978 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 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 71 [2021-11-07 01:09:51,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:52,009 INFO L225 Difference]: With dead ends: 14878 [2021-11-07 01:09:52,009 INFO L226 Difference]: Without dead ends: 9938 [2021-11-07 01:09:52,017 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 139 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 01:09:52,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9938 states. [2021-11-07 01:09:52,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9938 to 9765. [2021-11-07 01:09:52,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9765 states, 9763 states have (on average 1.7896138482023969) internal successors, (17472), 9764 states have internal predecessors, (17472), 0 states have call successors, (0), 0 states 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 01:09:52,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9765 states to 9765 states and 17472 transitions. [2021-11-07 01:09:52,739 INFO L78 Accepts]: Start accepts. Automaton has 9765 states and 17472 transitions. Word has length 71 [2021-11-07 01:09:52,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:52,739 INFO L470 AbstractCegarLoop]: Abstraction has 9765 states and 17472 transitions. [2021-11-07 01:09:52,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 01:09:52,740 INFO L276 IsEmpty]: Start isEmpty. Operand 9765 states and 17472 transitions. [2021-11-07 01:09:52,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:09:52,749 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:52,749 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] [2021-11-07 01:09:52,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:52,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:52,967 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:52,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:52,967 INFO L85 PathProgramCache]: Analyzing trace with hash -844498240, now seen corresponding path program 1 times [2021-11-07 01:09:52,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:52,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [857628154] [2021-11-07 01:09:52,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:52,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:52,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:52,969 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:52,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:09:53,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:53,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:53,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:53,876 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 01:09:53,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:54,107 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 01:09:54,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:54,107 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [857628154] [2021-11-07 01:09:54,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [857628154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:54,107 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [476917212] [2021-11-07 01:09:54,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:54,108 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:54,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:54,110 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:54,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:09:55,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:55,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:09:55,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:55,383 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 01:09:55,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:55,724 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 01:09:55,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [476917212] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:55,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:55,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:09:55,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459744615] [2021-11-07 01:09:55,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:09:55,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:55,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:09:55,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:09:55,728 INFO L87 Difference]: Start difference. First operand 9765 states and 17472 transitions. Second operand has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 0 states 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 01:10:02,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:02,437 INFO L93 Difference]: Finished difference Result 58176 states and 104575 transitions. [2021-11-07 01:10:02,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:10:02,438 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 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 72 [2021-11-07 01:10:02,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:02,662 INFO L225 Difference]: With dead ends: 58176 [2021-11-07 01:10:02,663 INFO L226 Difference]: Without dead ends: 58021 [2021-11-07 01:10:02,681 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 01:10:02,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58021 states. [2021-11-07 01:10:04,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58021 to 19472. [2021-11-07 01:10:04,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19472 states, 19470 states have (on average 1.7899332306111968) internal successors, (34850), 19471 states have internal predecessors, (34850), 0 states have call successors, (0), 0 states 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 01:10:04,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19472 states to 19472 states and 34850 transitions. [2021-11-07 01:10:04,892 INFO L78 Accepts]: Start accepts. Automaton has 19472 states and 34850 transitions. Word has length 72 [2021-11-07 01:10:04,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:04,892 INFO L470 AbstractCegarLoop]: Abstraction has 19472 states and 34850 transitions. [2021-11-07 01:10:04,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.7) internal successors, (107), 10 states have internal predecessors, (107), 0 states have call successors, (0), 0 states 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 01:10:04,893 INFO L276 IsEmpty]: Start isEmpty. Operand 19472 states and 34850 transitions. [2021-11-07 01:10:04,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:10:04,912 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:04,912 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] [2021-11-07 01:10:04,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:05,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:05,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:05,330 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:05,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:05,331 INFO L85 PathProgramCache]: Analyzing trace with hash -1073764028, now seen corresponding path program 1 times [2021-11-07 01:10:05,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:05,331 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1895726923] [2021-11-07 01:10:05,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:05,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:05,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:05,333 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:05,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:10:06,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:06,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:06,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:06,331 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 01:10:06,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:06,590 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 01:10:06,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:06,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1895726923] [2021-11-07 01:10:06,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1895726923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:06,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1844579379] [2021-11-07 01:10:06,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:06,590 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:06,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:06,591 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:06,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:10:07,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:07,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:10:07,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:07,873 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 01:10:07,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:08,097 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 01:10:08,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1844579379] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:08,098 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:08,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:10:08,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157631812] [2021-11-07 01:10:08,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:10:08,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:08,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:10:08,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:10:08,100 INFO L87 Difference]: Start difference. First operand 19472 states and 34850 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 01:10:11,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:11,218 INFO L93 Difference]: Finished difference Result 19923 states and 35597 transitions. [2021-11-07 01:10:11,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:10:11,218 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 73 [2021-11-07 01:10:11,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:11,277 INFO L225 Difference]: With dead ends: 19923 [2021-11-07 01:10:11,277 INFO L226 Difference]: Without dead ends: 19643 [2021-11-07 01:10:11,285 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:10:11,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19643 states. [2021-11-07 01:10:12,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19643 to 19466. [2021-11-07 01:10:12,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19466 states, 19464 states have (on average 1.7898170982326347) internal successors, (34837), 19465 states have internal predecessors, (34837), 0 states have call successors, (0), 0 states 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 01:10:12,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19466 states to 19466 states and 34837 transitions. [2021-11-07 01:10:12,913 INFO L78 Accepts]: Start accepts. Automaton has 19466 states and 34837 transitions. Word has length 73 [2021-11-07 01:10:12,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:12,914 INFO L470 AbstractCegarLoop]: Abstraction has 19466 states and 34837 transitions. [2021-11-07 01:10:12,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 01:10:12,915 INFO L276 IsEmpty]: Start isEmpty. Operand 19466 states and 34837 transitions. [2021-11-07 01:10:12,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:10:12,934 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:12,934 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] [2021-11-07 01:10:12,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:13,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-07 01:10:13,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:13,353 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:13,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:13,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1038725613, now seen corresponding path program 1 times [2021-11-07 01:10:13,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:13,354 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [279272950] [2021-11-07 01:10:13,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:13,354 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:13,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:13,355 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:13,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:10:14,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:14,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:10:14,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:14,320 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 01:10:14,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:14,485 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 01:10:14,485 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:14,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [279272950] [2021-11-07 01:10:14,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [279272950] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:14,485 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:10:14,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:10:14,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905432852] [2021-11-07 01:10:14,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:10:14,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:14,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:10:14,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:10:14,487 INFO L87 Difference]: Start difference. First operand 19466 states and 34837 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 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 01:10:15,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:15,910 INFO L93 Difference]: Finished difference Result 38026 states and 68277 transitions. [2021-11-07 01:10:15,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:10:15,911 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 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 73 [2021-11-07 01:10:15,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:15,950 INFO L225 Difference]: With dead ends: 38026 [2021-11-07 01:10:15,950 INFO L226 Difference]: Without dead ends: 18803 [2021-11-07 01:10:15,977 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 142 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 01:10:15,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18803 states. [2021-11-07 01:10:16,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18803 to 9763. [2021-11-07 01:10:16,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9763 states, 9761 states have (on average 1.7890584981047024) internal successors, (17463), 9762 states have internal predecessors, (17463), 0 states have call successors, (0), 0 states 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 01:10:16,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9763 states to 9763 states and 17463 transitions. [2021-11-07 01:10:16,942 INFO L78 Accepts]: Start accepts. Automaton has 9763 states and 17463 transitions. Word has length 73 [2021-11-07 01:10:16,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:16,943 INFO L470 AbstractCegarLoop]: Abstraction has 9763 states and 17463 transitions. [2021-11-07 01:10:16,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 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 01:10:16,943 INFO L276 IsEmpty]: Start isEmpty. Operand 9763 states and 17463 transitions. [2021-11-07 01:10:16,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:10:16,953 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:16,953 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] [2021-11-07 01:10:16,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:17,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:10:17,170 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:17,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:17,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1023746102, now seen corresponding path program 1 times [2021-11-07 01:10:17,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:17,172 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2084258066] [2021-11-07 01:10:17,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:17,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:17,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:17,173 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:17,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:10:18,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:18,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:18,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:18,250 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 01:10:18,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:18,468 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 01:10:18,468 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:18,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2084258066] [2021-11-07 01:10:18,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2084258066] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:18,469 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2091487845] [2021-11-07 01:10:18,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:18,469 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:18,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:18,471 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:18,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:10:19,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:19,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:10:19,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:20,460 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 01:10:20,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:20,911 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 01:10:20,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2091487845] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:20,912 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:20,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:10:20,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909636683] [2021-11-07 01:10:20,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:10:20,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:20,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:10:20,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:10:20,915 INFO L87 Difference]: Start difference. First operand 9763 states and 17463 transitions. Second operand has 16 states, 16 states have (on average 7.75) internal successors, (124), 15 states have internal predecessors, (124), 0 states have call successors, (0), 0 states 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 01:10:37,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:37,204 INFO L93 Difference]: Finished difference Result 20392 states and 36326 transitions. [2021-11-07 01:10:37,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:10:37,205 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.75) internal successors, (124), 15 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 01:10:37,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:37,232 INFO L225 Difference]: With dead ends: 20392 [2021-11-07 01:10:37,232 INFO L226 Difference]: Without dead ends: 20248 [2021-11-07 01:10:37,235 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 01:10:37,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20248 states. [2021-11-07 01:10:38,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20248 to 19330. [2021-11-07 01:10:38,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19330 states, 19328 states have (on average 1.7905111754966887) internal successors, (34607), 19329 states have internal predecessors, (34607), 0 states have call successors, (0), 0 states 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 01:10:38,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19330 states to 19330 states and 34607 transitions. [2021-11-07 01:10:38,575 INFO L78 Accepts]: Start accepts. Automaton has 19330 states and 34607 transitions. Word has length 75 [2021-11-07 01:10:38,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:38,575 INFO L470 AbstractCegarLoop]: Abstraction has 19330 states and 34607 transitions. [2021-11-07 01:10:38,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.75) internal successors, (124), 15 states have internal predecessors, (124), 0 states have call successors, (0), 0 states 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 01:10:38,575 INFO L276 IsEmpty]: Start isEmpty. Operand 19330 states and 34607 transitions. [2021-11-07 01:10:38,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:10:38,590 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:38,590 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] [2021-11-07 01:10:38,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:38,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-07 01:10:38,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:10:38,991 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:38,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:38,992 INFO L85 PathProgramCache]: Analyzing trace with hash 851039206, now seen corresponding path program 1 times [2021-11-07 01:10:38,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:38,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [579824966] [2021-11-07 01:10:38,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:38,993 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:38,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:38,993 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:38,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:10:39,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:39,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:10:39,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:40,152 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 01:10:40,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:40,371 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 01:10:40,371 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:40,371 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [579824966] [2021-11-07 01:10:40,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [579824966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:40,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [515910147] [2021-11-07 01:10:40,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:10:40,372 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:40,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:40,376 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:40,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:10:41,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:10:41,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 01:10:41,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:42,432 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 01:10:42,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:42,822 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 01:10:42,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [515910147] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:10:42,822 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:10:42,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 01:10:42,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14875052] [2021-11-07 01:10:42,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:10:42,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:42,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:10:42,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:10:42,825 INFO L87 Difference]: Start difference. First operand 19330 states and 34607 transitions. Second operand has 16 states, 16 states have (on average 7.875) internal successors, (126), 15 states have internal predecessors, (126), 0 states have call successors, (0), 0 states 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 01:10:58,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:58,290 INFO L93 Difference]: Finished difference Result 40039 states and 71441 transitions. [2021-11-07 01:10:58,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:10:58,290 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.875) internal successors, (126), 15 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 01:10:58,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:58,352 INFO L225 Difference]: With dead ends: 40039 [2021-11-07 01:10:58,352 INFO L226 Difference]: Without dead ends: 39787 [2021-11-07 01:10:58,359 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 01:10:58,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39787 states. [2021-11-07 01:11:00,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39787 to 38383. [2021-11-07 01:11:00,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38383 states, 38381 states have (on average 1.7913290430160758) internal successors, (68753), 38382 states have internal predecessors, (68753), 0 states have call successors, (0), 0 states 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 01:11:00,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38383 states to 38383 states and 68753 transitions. [2021-11-07 01:11:00,942 INFO L78 Accepts]: Start accepts. Automaton has 38383 states and 68753 transitions. Word has length 76 [2021-11-07 01:11:00,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:11:00,943 INFO L470 AbstractCegarLoop]: Abstraction has 38383 states and 68753 transitions. [2021-11-07 01:11:00,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.875) internal successors, (126), 15 states have internal predecessors, (126), 0 states have call successors, (0), 0 states 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 01:11:00,943 INFO L276 IsEmpty]: Start isEmpty. Operand 38383 states and 68753 transitions. [2021-11-07 01:11:00,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:11:00,960 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:11:00,960 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] [2021-11-07 01:11:00,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:01,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:01,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:11:01,367 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:11:01,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:11:01,368 INFO L85 PathProgramCache]: Analyzing trace with hash -428824472, now seen corresponding path program 1 times [2021-11-07 01:11:01,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:11:01,368 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [635628223] [2021-11-07 01:11:01,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:01,368 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:11:01,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:11:01,369 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:11:01,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:11:02,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:02,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:02,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:02,591 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 01:11:02,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:02,820 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 01:11:02,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:11:02,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [635628223] [2021-11-07 01:11:02,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [635628223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:11:02,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1718773442] [2021-11-07 01:11:02,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:02,821 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:11:02,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:11:02,833 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:11:02,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:11:04,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:04,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 506 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 01:11:04,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:04,597 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 01:11:04,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:04,937 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 01:11:04,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1718773442] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:11:04,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:11:04,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:11:04,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55797935] [2021-11-07 01:11:04,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:11:04,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:11:04,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:11:04,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:11:04,940 INFO L87 Difference]: Start difference. First operand 38383 states and 68753 transitions. Second operand has 11 states, 11 states have (on average 12.090909090909092) internal successors, (133), 11 states have internal predecessors, (133), 0 states have call successors, (0), 0 states 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 01:11:17,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:11:17,289 INFO L93 Difference]: Finished difference Result 153233 states and 275761 transitions. [2021-11-07 01:11:17,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 01:11:17,289 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 12.090909090909092) internal successors, (133), 11 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 01:11:17,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:11:17,581 INFO L225 Difference]: With dead ends: 153233 [2021-11-07 01:11:17,581 INFO L226 Difference]: Without dead ends: 153221 [2021-11-07 01:11:17,840 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=958, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 01:11:17,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153221 states. [2021-11-07 01:11:22,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153221 to 38391. [2021-11-07 01:11:22,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38391 states, 38389 states have (on average 1.791138086431009) internal successors, (68760), 38390 states have internal predecessors, (68760), 0 states have call successors, (0), 0 states 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 01:11:22,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38391 states to 38391 states and 68760 transitions. [2021-11-07 01:11:22,134 INFO L78 Accepts]: Start accepts. Automaton has 38391 states and 68760 transitions. Word has length 76 [2021-11-07 01:11:22,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:11:22,135 INFO L470 AbstractCegarLoop]: Abstraction has 38391 states and 68760 transitions. [2021-11-07 01:11:22,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 12.090909090909092) internal successors, (133), 11 states have internal predecessors, (133), 0 states have call successors, (0), 0 states 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 01:11:22,135 INFO L276 IsEmpty]: Start isEmpty. Operand 38391 states and 68760 transitions. [2021-11-07 01:11:22,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 01:11:22,152 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:11:22,152 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] [2021-11-07 01:11:22,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:22,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:22,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:11:22,553 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:11:22,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:11:22,554 INFO L85 PathProgramCache]: Analyzing trace with hash -407079373, now seen corresponding path program 1 times [2021-11-07 01:11:22,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:11:22,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1333173359] [2021-11-07 01:11:22,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:22,555 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:11:22,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:11:22,556 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:11:22,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:11:23,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:23,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:23,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:23,810 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 01:11:23,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:24,044 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 01:11:24,045 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:11:24,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1333173359] [2021-11-07 01:11:24,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1333173359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:11:24,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [889589276] [2021-11-07 01:11:24,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:24,045 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:11:24,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:11:24,046 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:11:24,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:11:25,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:25,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-07 01:11:25,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:25,923 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 01:11:25,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:26,209 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 01:11:26,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [889589276] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:11:26,209 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:11:26,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:11:26,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480835215] [2021-11-07 01:11:26,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:11:26,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:11:26,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:11:26,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:11:26,211 INFO L87 Difference]: Start difference. First operand 38391 states and 68760 transitions. Second operand has 9 states, 9 states have (on average 7.888888888888889) internal successors, (71), 9 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 01:11:31,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:11:31,404 INFO L93 Difference]: Finished difference Result 39070 states and 69880 transitions. [2021-11-07 01:11:31,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:11:31,405 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.888888888888889) internal successors, (71), 9 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-07 01:11:31,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:11:31,457 INFO L225 Difference]: With dead ends: 39070 [2021-11-07 01:11:31,457 INFO L226 Difference]: Without dead ends: 38681 [2021-11-07 01:11:31,465 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=168, Invalid=588, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:11:31,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38681 states. [2021-11-07 01:11:34,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38681 to 38373. [2021-11-07 01:11:34,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38373 states, 38372 states have (on average 1.791071614719066) internal successors, (68727), 38372 states have internal predecessors, (68727), 0 states have call successors, (0), 0 states 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 01:11:34,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38373 states to 38373 states and 68727 transitions. [2021-11-07 01:11:34,260 INFO L78 Accepts]: Start accepts. Automaton has 38373 states and 68727 transitions. Word has length 77 [2021-11-07 01:11:34,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:11:34,260 INFO L470 AbstractCegarLoop]: Abstraction has 38373 states and 68727 transitions. [2021-11-07 01:11:34,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 7.888888888888889) internal successors, (71), 9 states have internal predecessors, (71), 0 states have call successors, (0), 0 states 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 01:11:34,261 INFO L276 IsEmpty]: Start isEmpty. Operand 38373 states and 68727 transitions. [2021-11-07 01:11:34,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 01:11:34,315 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:11:34,315 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 01:11:34,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:34,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:34,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:11:34,716 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:11:34,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:11:34,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1788706222, now seen corresponding path program 1 times [2021-11-07 01:11:34,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:11:34,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1684807754] [2021-11-07 01:11:34,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:34,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:11:34,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:11:34,719 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:11:34,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:11:36,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:36,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:36,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:36,312 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 01:11:36,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:36,670 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 01:11:36,670 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:11:36,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1684807754] [2021-11-07 01:11:36,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1684807754] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:11:36,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [839284579] [2021-11-07 01:11:36,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:36,671 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:11:36,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:11:36,671 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:11:36,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:11:38,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:38,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:38,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:38,833 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 01:11:38,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:39,102 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 01:11:39,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [839284579] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:11:39,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:11:39,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:11:39,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081813712] [2021-11-07 01:11:39,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:11:39,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:11:39,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:11:39,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:11:39,104 INFO L87 Difference]: Start difference. First operand 38373 states and 68727 transitions. Second operand has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states 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 01:11:41,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:11:41,708 INFO L93 Difference]: Finished difference Result 38536 states and 68994 transitions. [2021-11-07 01:11:41,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:11:41,710 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 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 01:11:41,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:11:41,774 INFO L225 Difference]: With dead ends: 38536 [2021-11-07 01:11:41,774 INFO L226 Difference]: Without dead ends: 38372 [2021-11-07 01:11:41,782 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 444 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 01:11:41,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38372 states. [2021-11-07 01:11:44,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38372 to 38372. [2021-11-07 01:11:44,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38372 states, 38371 states have (on average 1.7909619243699668) internal successors, (68721), 38371 states have internal predecessors, (68721), 0 states have call successors, (0), 0 states 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 01:11:44,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38372 states to 38372 states and 68721 transitions. [2021-11-07 01:11:44,443 INFO L78 Accepts]: Start accepts. Automaton has 38372 states and 68721 transitions. Word has length 114 [2021-11-07 01:11:44,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:11:44,443 INFO L470 AbstractCegarLoop]: Abstraction has 38372 states and 68721 transitions. [2021-11-07 01:11:44,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states 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 01:11:44,444 INFO L276 IsEmpty]: Start isEmpty. Operand 38372 states and 68721 transitions. [2021-11-07 01:11:44,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-07 01:11:44,505 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:11:44,506 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 01:11:44,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:44,729 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-07 01:11:44,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:11:44,913 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:11:44,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:11:44,913 INFO L85 PathProgramCache]: Analyzing trace with hash -517327655, now seen corresponding path program 1 times [2021-11-07 01:11:44,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:11:44,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1843781530] [2021-11-07 01:11:44,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:44,914 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:11:44,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:11:44,915 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:11:44,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:11:46,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:46,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:46,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:46,566 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 01:11:46,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:46,963 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 01:11:46,963 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:11:46,963 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1843781530] [2021-11-07 01:11:46,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1843781530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:11:46,963 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1809460804] [2021-11-07 01:11:46,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:46,964 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:11:46,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:11:46,965 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:11:46,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:11:48,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:48,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 637 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:11:48,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:11:49,175 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 01:11:49,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:11:49,528 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 01:11:49,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1809460804] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:11:49,529 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:11:49,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:11:49,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830956554] [2021-11-07 01:11:49,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:11:49,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:11:49,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:11:49,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:11:49,530 INFO L87 Difference]: Start difference. First operand 38372 states and 68721 transitions. Second operand has 11 states, 11 states have (on average 11.909090909090908) internal successors, (131), 11 states have internal predecessors, (131), 0 states have call successors, (0), 0 states 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 01:11:55,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:11:55,073 INFO L93 Difference]: Finished difference Result 41046 states and 73114 transitions. [2021-11-07 01:11:55,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 01:11:55,074 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 11.909090909090908) internal successors, (131), 11 states have internal predecessors, (131), 0 states have call successors, (0), 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 01:11:55,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:11:55,135 INFO L225 Difference]: With dead ends: 41046 [2021-11-07 01:11:55,135 INFO L226 Difference]: Without dead ends: 40675 [2021-11-07 01:11:55,142 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:11:55,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40675 states. [2021-11-07 01:11:57,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40675 to 38519. [2021-11-07 01:11:57,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38519 states, 38518 states have (on average 1.7905394880315697) internal successors, (68968), 38518 states have internal predecessors, (68968), 0 states have call successors, (0), 0 states 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 01:11:58,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38519 states to 38519 states and 68968 transitions. [2021-11-07 01:11:58,039 INFO L78 Accepts]: Start accepts. Automaton has 38519 states and 68968 transitions. Word has length 115 [2021-11-07 01:11:58,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:11:58,039 INFO L470 AbstractCegarLoop]: Abstraction has 38519 states and 68968 transitions. [2021-11-07 01:11:58,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 11.909090909090908) internal successors, (131), 11 states have internal predecessors, (131), 0 states have call successors, (0), 0 states 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 01:11:58,039 INFO L276 IsEmpty]: Start isEmpty. Operand 38519 states and 68968 transitions. [2021-11-07 01:11:58,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:11:58,082 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:11:58,082 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 01:11:58,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:11:58,297 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-11-07 01:11:58,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:11:58,483 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:11:58,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:11:58,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1282301585, now seen corresponding path program 1 times [2021-11-07 01:11:58,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:11:58,484 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1777639271] [2021-11-07 01:11:58,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:11:58,485 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:11:58,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:11:58,485 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:11:58,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:11:59,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:11:59,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:11:59,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:12:00,214 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 01:12:00,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:12:00,636 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 01:12:00,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:12:00,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1777639271] [2021-11-07 01:12:00,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1777639271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:12:00,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1032884437] [2021-11-07 01:12:00,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:12:00,637 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:12:00,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:12:00,642 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:12:00,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:12:02,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:12:02,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-07 01:12:02,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:12:03,132 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 01:12:03,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:12:03,477 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 01:12:03,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1032884437] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:12:03,477 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:12:03,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 01:12:03,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963029561] [2021-11-07 01:12:03,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:12:03,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:12:03,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:12:03,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:12:03,479 INFO L87 Difference]: Start difference. First operand 38519 states and 68968 transitions. Second operand has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 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 01:12:06,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:12:06,711 INFO L93 Difference]: Finished difference Result 39139 states and 69972 transitions. [2021-11-07 01:12:06,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:12:06,711 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 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 01:12:06,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:12:06,769 INFO L225 Difference]: With dead ends: 39139 [2021-11-07 01:12:06,770 INFO L226 Difference]: Without dead ends: 38744 [2021-11-07 01:12:06,777 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 448 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=431, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:12:06,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38744 states. [2021-11-07 01:12:09,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38744 to 38515. [2021-11-07 01:12:09,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38515 states, 38514 states have (on average 1.7903100171366257) internal successors, (68952), 38514 states have internal predecessors, (68952), 0 states have call successors, (0), 0 states 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 01:12:09,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38515 states to 38515 states and 68952 transitions. [2021-11-07 01:12:09,688 INFO L78 Accepts]: Start accepts. Automaton has 38515 states and 68952 transitions. Word has length 116 [2021-11-07 01:12:09,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:12:09,688 INFO L470 AbstractCegarLoop]: Abstraction has 38515 states and 68952 transitions. [2021-11-07 01:12:09,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 13.75) internal successors, (110), 8 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 01:12:09,689 INFO L276 IsEmpty]: Start isEmpty. Operand 38515 states and 68952 transitions. [2021-11-07 01:12:09,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 01:12:09,741 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:12:09,741 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 01:12:09,763 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:12:09,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:12:10,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:12:10,142 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:12:10,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:12:10,143 INFO L85 PathProgramCache]: Analyzing trace with hash -478078373, now seen corresponding path program 1 times [2021-11-07 01:12:10,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:12:10,144 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [201311130] [2021-11-07 01:12:10,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:12:10,144 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:12:10,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:12:10,146 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:12:10,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:12:11,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:12:11,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:12:11,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:12:12,106 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 01:12:12,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:12:12,551 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 01:12:12,551 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:12:12,551 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [201311130] [2021-11-07 01:12:12,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [201311130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:12:12,551 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [290766576] [2021-11-07 01:12:12,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:12:12,552 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:12:12,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:12:12,553 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:12:12,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f6ccf3c-593f-4fa9-8f1e-ed3a69e1798e/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:12:14,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:12:14,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:12:14,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:12:15,056 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 01:12:15,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:12:15,345 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 01:12:15,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [290766576] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:12:15,345 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:12:15,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:12:15,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946068764] [2021-11-07 01:12:15,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:12:15,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:12:15,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:12:15,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:12:15,348 INFO L87 Difference]: Start difference. First operand 38515 states and 68952 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 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 01:12:18,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:12:18,078 INFO L93 Difference]: Finished difference Result 38965 states and 69680 transitions. [2021-11-07 01:12:18,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:12:18,085 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 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 01:12:18,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:12:18,133 INFO L225 Difference]: With dead ends: 38965 [2021-11-07 01:12:18,133 INFO L226 Difference]: Without dead ends: 38431 [2021-11-07 01:12:18,140 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:12:18,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38431 states.