./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec27_product19.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_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/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_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product19.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/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_1008944e-25f6-4322-bfb1-dbef902010d3/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 195d502e207cba6e22b4d3a0f1eab4288ed491325552159482eaed582ac159e0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:46:34,209 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:46:34,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:46:34,267 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:46:34,268 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:46:34,273 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:46:34,276 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:46:34,280 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:46:34,283 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:46:34,291 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:46:34,293 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:46:34,295 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:46:34,296 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:46:34,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:46:34,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:46:34,308 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:46:34,311 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:46:34,312 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:46:34,317 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:46:34,322 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:46:34,327 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:46:34,328 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:46:34,332 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:46:34,333 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:46:34,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:46:34,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:46:34,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:46:34,345 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:46:34,346 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:46:34,347 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:46:34,348 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:46:34,350 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:46:34,352 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:46:34,353 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:46:34,355 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:46:34,355 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:46:34,356 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:46:34,357 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:46:34,357 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:46:34,358 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:46:34,359 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:46:34,360 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:46:34,413 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:46:34,416 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:46:34,418 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:46:34,418 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:46:34,418 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:46:34,419 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:46:34,419 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:46:34,419 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:46:34,426 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:46:34,426 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:46:34,427 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:46:34,428 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:46:34,428 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:46:34,428 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:46:34,428 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:46:34,429 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:46:34,429 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:46:34,430 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:46:34,430 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:46:34,430 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:46:34,430 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:46:34,431 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:46:34,431 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:46:34,431 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:46:34,432 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:46:34,432 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:46:34,432 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:46:34,432 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:46:34,433 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:46:34,435 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:46:34,435 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:46:34,436 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:46:34,436 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:46:34,436 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:46:34,437 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:46:34,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:46:34,437 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:46:34,437 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:46:34,438 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:46:34,438 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_1008944e-25f6-4322-bfb1-dbef902010d3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 195d502e207cba6e22b4d3a0f1eab4288ed491325552159482eaed582ac159e0 [2021-11-07 01:46:34,732 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:46:34,756 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:46:34,759 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:46:34,760 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:46:34,761 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:46:34,762 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product19.cil.c [2021-11-07 01:46:34,829 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/d63ef23c9/e737cf3d581a4cec88af880a6fe0cd30/FLAGe97671a1c [2021-11-07 01:46:35,448 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:46:35,449 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c [2021-11-07 01:46:35,475 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/d63ef23c9/e737cf3d581a4cec88af880a6fe0cd30/FLAGe97671a1c [2021-11-07 01:46:35,698 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/d63ef23c9/e737cf3d581a4cec88af880a6fe0cd30 [2021-11-07 01:46:35,701 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:46:35,703 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:46:35,719 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:46:35,720 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:46:35,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:46:35,724 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:46:35" (1/1) ... [2021-11-07 01:46:35,726 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79ea0eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:35, skipping insertion in model container [2021-11-07 01:46:35,726 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:46:35" (1/1) ... [2021-11-07 01:46:35,737 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:46:35,834 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:46:36,275 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_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c[17762,17775] [2021-11-07 01:46:36,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:46:36,601 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 01:46:36,602 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@1e274121 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:36, skipping insertion in model container [2021-11-07 01:46:36,602 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:46:36,602 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:46:36,605 INFO L168 Benchmark]: Toolchain (without parser) took 900.34 ms. Allocated memory is still 117.4 MB. Free memory was 85.1 MB in the beginning and 78.3 MB in the end (delta: 6.9 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:46:36,606 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 117.4 MB. Free memory is still 71.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:46:36,612 INFO L168 Benchmark]: CACSL2BoogieTranslator took 882.99 ms. Allocated memory is still 117.4 MB. Free memory was 84.8 MB in the beginning and 78.3 MB in the end (delta: 6.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-07 01:46:36,615 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 117.4 MB. Free memory is still 71.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 882.99 ms. Allocated memory is still 117.4 MB. Free memory was 84.8 MB in the beginning and 78.3 MB in the end (delta: 6.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 77]: 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_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/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_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product19.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/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_1008944e-25f6-4322-bfb1-dbef902010d3/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 195d502e207cba6e22b4d3a0f1eab4288ed491325552159482eaed582ac159e0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:46:39,325 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:46:39,328 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:46:39,382 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:46:39,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:46:39,383 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:46:39,385 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:46:39,387 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:46:39,389 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:46:39,390 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:46:39,392 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:46:39,393 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:46:39,394 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:46:39,399 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:46:39,401 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:46:39,404 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:46:39,409 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:46:39,411 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:46:39,417 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:46:39,419 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:46:39,425 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:46:39,426 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:46:39,432 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:46:39,433 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:46:39,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:46:39,443 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:46:39,444 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:46:39,446 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:46:39,447 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:46:39,448 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:46:39,449 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:46:39,450 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:46:39,452 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:46:39,453 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:46:39,455 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:46:39,456 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:46:39,457 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:46:39,457 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:46:39,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:46:39,459 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:46:39,460 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:46:39,466 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:46:39,505 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:46:39,506 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:46:39,507 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:46:39,507 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:46:39,507 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:46:39,508 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:46:39,508 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:46:39,508 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:46:39,508 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:46:39,509 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:46:39,509 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:46:39,510 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:46:39,510 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:46:39,510 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:46:39,510 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:46:39,511 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:46:39,511 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:46:39,511 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:46:39,511 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:46:39,511 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:46:39,512 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:46:39,512 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:46:39,512 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:46:39,512 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:46:39,513 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:46:39,513 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:46:39,513 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:46:39,513 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:46:39,514 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:46:39,514 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:46:39,514 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:46:39,514 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:46:39,514 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:46:39,515 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:46:39,516 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:46:39,516 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_1008944e-25f6-4322-bfb1-dbef902010d3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 195d502e207cba6e22b4d3a0f1eab4288ed491325552159482eaed582ac159e0 [2021-11-07 01:46:39,943 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:46:39,977 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:46:39,980 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:46:39,981 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:46:39,982 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:46:39,983 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product19.cil.c [2021-11-07 01:46:40,068 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/ff80997db/533272bddcb84a4cba43dc2b39ba54c1/FLAG9cf57c2e6 [2021-11-07 01:46:40,830 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:46:40,832 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c [2021-11-07 01:46:40,867 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/ff80997db/533272bddcb84a4cba43dc2b39ba54c1/FLAG9cf57c2e6 [2021-11-07 01:46:40,928 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/data/ff80997db/533272bddcb84a4cba43dc2b39ba54c1 [2021-11-07 01:46:40,935 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:46:40,936 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:46:40,938 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:46:40,938 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:46:40,946 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:46:40,948 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:46:40" (1/1) ... [2021-11-07 01:46:40,951 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f6b84e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:40, skipping insertion in model container [2021-11-07 01:46:40,951 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:46:40" (1/1) ... [2021-11-07 01:46:40,960 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:46:41,057 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:46:41,550 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_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c[17762,17775] [2021-11-07 01:46:41,749 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:46:41,779 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:46:41,809 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:46:41,885 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_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c[17762,17775] [2021-11-07 01:46:41,967 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:46:41,980 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:46:42,053 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_1008944e-25f6-4322-bfb1-dbef902010d3/sv-benchmarks/c/product-lines/email_spec27_product19.cil.c[17762,17775] [2021-11-07 01:46:42,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:46:42,196 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:46:42,196 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42 WrapperNode [2021-11-07 01:46:42,196 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:46:42,198 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:46:42,198 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:46:42,198 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:46:42,206 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,252 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,358 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:46:42,359 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:46:42,359 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:46:42,359 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:46:42,369 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,369 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,442 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,477 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,500 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,520 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:46:42,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:46:42,528 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:46:42,528 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:46:42,529 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (1/1) ... [2021-11-07 01:46:42,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:46:42,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:46:42,564 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:46:42,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:46:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:46:42,624 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:46:42,624 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:46:42,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:46:42,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:46:47,242 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:46:47,243 INFO L299 CfgBuilder]: Removed 303 assume(true) statements. [2021-11-07 01:46:47,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:46:47 BoogieIcfgContainer [2021-11-07 01:46:47,246 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:46:47,248 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:46:47,248 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:46:47,260 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:46:47,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:46:40" (1/3) ... [2021-11-07 01:46:47,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12f4f20d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:46:47, skipping insertion in model container [2021-11-07 01:46:47,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:46:42" (2/3) ... [2021-11-07 01:46:47,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12f4f20d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:46:47, skipping insertion in model container [2021-11-07 01:46:47,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:46:47" (3/3) ... [2021-11-07 01:46:47,264 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec27_product19.cil.c [2021-11-07 01:46:47,278 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:46:47,279 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:46:47,359 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:46:47,370 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 01:46:47,370 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:46:47,433 INFO L276 IsEmpty]: Start isEmpty. Operand has 467 states, 464 states have (on average 1.75) internal successors, (812), 466 states have internal predecessors, (812), 0 states have call successors, (0), 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 01:46:47,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 01:46:47,467 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:47,468 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 01:46:47,468 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:47,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:47,474 INFO L85 PathProgramCache]: Analyzing trace with hash -167129029, now seen corresponding path program 1 times [2021-11-07 01:46:47,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:47,491 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2085868089] [2021-11-07 01:46:47,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:47,492 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:47,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:47,496 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:47,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:46:47,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:47,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:46:47,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:48,182 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 01:46:48,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:48,360 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 01:46:48,361 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:48,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2085868089] [2021-11-07 01:46:48,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2085868089] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:48,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:48,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:46:48,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942430434] [2021-11-07 01:46:48,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:46:48,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:48,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:46:48,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:46:48,390 INFO L87 Difference]: Start difference. First operand has 467 states, 464 states have (on average 1.75) internal successors, (812), 466 states have internal predecessors, (812), 0 states have call successors, (0), 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 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:48,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:48,448 INFO L93 Difference]: Finished difference Result 692 states and 1183 transitions. [2021-11-07 01:46:48,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:46:48,449 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 01:46:48,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:48,469 INFO L225 Difference]: With dead ends: 692 [2021-11-07 01:46:48,470 INFO L226 Difference]: Without dead ends: 431 [2021-11-07 01:46:48,478 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 94 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 01:46:48,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-11-07 01:46:48,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 431. [2021-11-07 01:46:48,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 429 states have (on average 1.7505827505827505) internal successors, (751), 430 states have internal predecessors, (751), 0 states have call successors, (0), 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 01:46:48,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 751 transitions. [2021-11-07 01:46:48,619 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 751 transitions. Word has length 48 [2021-11-07 01:46:48,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:48,620 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 751 transitions. [2021-11-07 01:46:48,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:48,620 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 751 transitions. [2021-11-07 01:46:48,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 01:46:48,632 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:48,633 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:46:48,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:48,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:48,850 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:48,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:48,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1593484696, now seen corresponding path program 1 times [2021-11-07 01:46:48,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:48,852 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [631143267] [2021-11-07 01:46:48,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:48,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:48,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:48,856 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:48,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:46:49,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:49,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:46:49,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:49,522 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 01:46:49,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:49,704 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 01:46:49,705 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:49,705 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [631143267] [2021-11-07 01:46:49,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [631143267] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:49,706 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:49,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:46:49,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586962718] [2021-11-07 01:46:49,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:46:49,708 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:49,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:46:49,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:49,710 INFO L87 Difference]: Start difference. First operand 431 states and 751 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 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 01:46:49,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:49,856 INFO L93 Difference]: Finished difference Result 1263 states and 2205 transitions. [2021-11-07 01:46:49,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:46:49,857 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 01:46:49,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:49,867 INFO L225 Difference]: With dead ends: 1263 [2021-11-07 01:46:49,867 INFO L226 Difference]: Without dead ends: 847 [2021-11-07 01:46:49,871 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:49,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2021-11-07 01:46:49,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 430. [2021-11-07 01:46:49,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 428 states have (on average 1.7429906542056075) internal successors, (746), 429 states have internal predecessors, (746), 0 states have call successors, (0), 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 01:46:49,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 746 transitions. [2021-11-07 01:46:49,929 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 746 transitions. Word has length 49 [2021-11-07 01:46:49,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:49,930 INFO L470 AbstractCegarLoop]: Abstraction has 430 states and 746 transitions. [2021-11-07 01:46:49,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 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 01:46:49,931 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 746 transitions. [2021-11-07 01:46:49,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:46:49,942 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:49,943 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 01:46:49,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:50,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:50,144 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:50,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:50,145 INFO L85 PathProgramCache]: Analyzing trace with hash 42991054, now seen corresponding path program 1 times [2021-11-07 01:46:50,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:50,146 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [313820083] [2021-11-07 01:46:50,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:50,147 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:50,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:50,149 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:50,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:46:50,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:50,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:46:50,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:50,881 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 01:46:50,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:51,066 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 01:46:51,067 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:51,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [313820083] [2021-11-07 01:46:51,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [313820083] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:51,068 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:51,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:46:51,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854179612] [2021-11-07 01:46:51,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:46:51,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:51,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:46:51,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:46:51,078 INFO L87 Difference]: Start difference. First operand 430 states and 746 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:51,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:51,384 INFO L93 Difference]: Finished difference Result 1637 states and 2846 transitions. [2021-11-07 01:46:51,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:46:51,385 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:46:51,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:51,396 INFO L225 Difference]: With dead ends: 1637 [2021-11-07 01:46:51,396 INFO L226 Difference]: Without dead ends: 1225 [2021-11-07 01:46:51,397 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 96 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 01:46:51,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1225 states. [2021-11-07 01:46:51,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1225 to 429. [2021-11-07 01:46:51,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 427 states have (on average 1.7377049180327868) internal successors, (742), 428 states have internal predecessors, (742), 0 states have call successors, (0), 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 01:46:51,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 742 transitions. [2021-11-07 01:46:51,443 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 742 transitions. Word has length 51 [2021-11-07 01:46:51,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:51,444 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 742 transitions. [2021-11-07 01:46:51,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:51,446 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 742 transitions. [2021-11-07 01:46:51,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:46:51,448 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:51,448 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 01:46:51,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:51,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:51,671 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:51,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:51,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1661226655, now seen corresponding path program 1 times [2021-11-07 01:46:51,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:51,673 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1757384266] [2021-11-07 01:46:51,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:51,674 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:51,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:51,679 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:51,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:46:52,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:52,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:46:52,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:52,381 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 01:46:52,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:52,533 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 01:46:52,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:52,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1757384266] [2021-11-07 01:46:52,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1757384266] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:52,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:52,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:46:52,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107951738] [2021-11-07 01:46:52,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:46:52,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:52,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:46:52,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:52,539 INFO L87 Difference]: Start difference. First operand 429 states and 742 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:52,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:52,613 INFO L93 Difference]: Finished difference Result 855 states and 1481 transitions. [2021-11-07 01:46:52,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:46:52,613 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 01:46:52,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:52,617 INFO L225 Difference]: With dead ends: 855 [2021-11-07 01:46:52,617 INFO L226 Difference]: Without dead ends: 434 [2021-11-07 01:46:52,619 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:52,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-07 01:46:52,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 429. [2021-11-07 01:46:52,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 427 states have (on average 1.730679156908665) internal successors, (739), 428 states have internal predecessors, (739), 0 states have call successors, (0), 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 01:46:52,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 739 transitions. [2021-11-07 01:46:52,651 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 739 transitions. Word has length 52 [2021-11-07 01:46:52,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:52,653 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 739 transitions. [2021-11-07 01:46:52,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:46:52,653 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 739 transitions. [2021-11-07 01:46:52,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:46:52,655 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:52,655 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] [2021-11-07 01:46:52,670 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-07 01:46:52,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:52,870 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:52,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:52,871 INFO L85 PathProgramCache]: Analyzing trace with hash -755664714, now seen corresponding path program 1 times [2021-11-07 01:46:52,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:52,872 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [425168293] [2021-11-07 01:46:52,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:52,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:52,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:52,877 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:52,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:46:53,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:53,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:46:53,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:53,591 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 01:46:53,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:53,789 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 01:46:53,790 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:53,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [425168293] [2021-11-07 01:46:53,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [425168293] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:53,790 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:53,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:46:53,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647359872] [2021-11-07 01:46:53,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:46:53,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:53,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:46:53,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:46:53,792 INFO L87 Difference]: Start difference. First operand 429 states and 739 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 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 01:46:54,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:54,065 INFO L93 Difference]: Finished difference Result 1624 states and 2822 transitions. [2021-11-07 01:46:54,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:46:54,066 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 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 53 [2021-11-07 01:46:54,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:54,076 INFO L225 Difference]: With dead ends: 1624 [2021-11-07 01:46:54,076 INFO L226 Difference]: Without dead ends: 1221 [2021-11-07 01:46:54,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 100 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 01:46:54,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1221 states. [2021-11-07 01:46:54,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1221 to 429. [2021-11-07 01:46:54,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 427 states have (on average 1.7236533957845432) internal successors, (736), 428 states have internal predecessors, (736), 0 states have call successors, (0), 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 01:46:54,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 736 transitions. [2021-11-07 01:46:54,123 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 736 transitions. Word has length 53 [2021-11-07 01:46:54,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:54,124 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 736 transitions. [2021-11-07 01:46:54,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 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 01:46:54,124 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 736 transitions. [2021-11-07 01:46:54,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:46:54,126 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:54,126 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] [2021-11-07 01:46:54,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:54,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:54,344 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:54,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:54,344 INFO L85 PathProgramCache]: Analyzing trace with hash -314537551, now seen corresponding path program 1 times [2021-11-07 01:46:54,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:54,345 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1453724595] [2021-11-07 01:46:54,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:54,346 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:54,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:54,347 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:54,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:46:54,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:54,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:46:54,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:54,998 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 01:46:54,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:55,143 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 01:46:55,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:55,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1453724595] [2021-11-07 01:46:55,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1453724595] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:55,144 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:55,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:46:55,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046350837] [2021-11-07 01:46:55,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:46:55,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:55,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:46:55,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:55,147 INFO L87 Difference]: Start difference. First operand 429 states and 736 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 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 01:46:55,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:55,257 INFO L93 Difference]: Finished difference Result 1021 states and 1755 transitions. [2021-11-07 01:46:55,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:46:55,258 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 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 55 [2021-11-07 01:46:55,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:55,265 INFO L225 Difference]: With dead ends: 1021 [2021-11-07 01:46:55,265 INFO L226 Difference]: Without dead ends: 832 [2021-11-07 01:46:55,266 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 106 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 01:46:55,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-11-07 01:46:55,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 643. [2021-11-07 01:46:55,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 643 states, 641 states have (on average 1.7581903276131046) internal successors, (1127), 642 states have internal predecessors, (1127), 0 states have call successors, (0), 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 01:46:55,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 1127 transitions. [2021-11-07 01:46:55,331 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 1127 transitions. Word has length 55 [2021-11-07 01:46:55,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:55,332 INFO L470 AbstractCegarLoop]: Abstraction has 643 states and 1127 transitions. [2021-11-07 01:46:55,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 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 01:46:55,332 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 1127 transitions. [2021-11-07 01:46:55,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:46:55,334 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:55,335 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 01:46:55,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:55,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:55,552 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:55,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:55,553 INFO L85 PathProgramCache]: Analyzing trace with hash 67563010, now seen corresponding path program 1 times [2021-11-07 01:46:55,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:55,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [898658495] [2021-11-07 01:46:55,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:55,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:55,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:55,556 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:55,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:46:56,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:56,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:46:56,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:56,289 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 01:46:56,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:56,496 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 01:46:56,496 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:56,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [898658495] [2021-11-07 01:46:56,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [898658495] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:56,497 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:56,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:46:56,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690648708] [2021-11-07 01:46:56,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:46:56,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:56,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:46:56,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:46:56,500 INFO L87 Difference]: Start difference. First operand 643 states and 1127 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 01:46:56,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:56,617 INFO L93 Difference]: Finished difference Result 1553 states and 2729 transitions. [2021-11-07 01:46:56,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:46:56,618 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 01:46:56,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:56,626 INFO L225 Difference]: With dead ends: 1553 [2021-11-07 01:46:56,626 INFO L226 Difference]: Without dead ends: 994 [2021-11-07 01:46:56,629 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 01:46:56,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2021-11-07 01:46:56,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 805. [2021-11-07 01:46:56,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 805 states, 803 states have (on average 1.7696139476961394) internal successors, (1421), 804 states have internal predecessors, (1421), 0 states have call successors, (0), 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 01:46:56,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 805 states to 805 states and 1421 transitions. [2021-11-07 01:46:56,714 INFO L78 Accepts]: Start accepts. Automaton has 805 states and 1421 transitions. Word has length 67 [2021-11-07 01:46:56,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:56,716 INFO L470 AbstractCegarLoop]: Abstraction has 805 states and 1421 transitions. [2021-11-07 01:46:56,717 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 01:46:56,717 INFO L276 IsEmpty]: Start isEmpty. Operand 805 states and 1421 transitions. [2021-11-07 01:46:56,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:46:56,720 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:56,721 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 01:46:56,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-07 01:46:56,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:56,939 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:56,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:56,940 INFO L85 PathProgramCache]: Analyzing trace with hash -1555299743, now seen corresponding path program 1 times [2021-11-07 01:46:56,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:56,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1522735163] [2021-11-07 01:46:56,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:56,941 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:56,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:56,943 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:56,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:46:57,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:57,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:46:57,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:57,694 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 01:46:57,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:57,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:46:57,894 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:57,894 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1522735163] [2021-11-07 01:46:57,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1522735163] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:57,894 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:57,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:46:57,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861468334] [2021-11-07 01:46:57,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:46:57,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:57,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:46:57,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:46:57,896 INFO L87 Difference]: Start difference. First operand 805 states and 1421 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 01:46:58,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:58,039 INFO L93 Difference]: Finished difference Result 2083 states and 3697 transitions. [2021-11-07 01:46:58,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:46:58,039 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 01:46:58,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:58,050 INFO L225 Difference]: With dead ends: 2083 [2021-11-07 01:46:58,050 INFO L226 Difference]: Without dead ends: 1366 [2021-11-07 01:46:58,052 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 01:46:58,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1366 states. [2021-11-07 01:46:58,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1366 to 1177. [2021-11-07 01:46:58,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1177 states, 1175 states have (on average 1.7863829787234042) internal successors, (2099), 1176 states have internal predecessors, (2099), 0 states have call successors, (0), 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 01:46:58,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1177 states to 1177 states and 2099 transitions. [2021-11-07 01:46:58,153 INFO L78 Accepts]: Start accepts. Automaton has 1177 states and 2099 transitions. Word has length 68 [2021-11-07 01:46:58,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:58,153 INFO L470 AbstractCegarLoop]: Abstraction has 1177 states and 2099 transitions. [2021-11-07 01:46:58,154 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 01:46:58,154 INFO L276 IsEmpty]: Start isEmpty. Operand 1177 states and 2099 transitions. [2021-11-07 01:46:58,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:46:58,157 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:58,158 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, 1] [2021-11-07 01:46:58,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:58,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:58,381 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:58,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:58,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1412706543, now seen corresponding path program 1 times [2021-11-07 01:46:58,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:58,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [713155435] [2021-11-07 01:46:58,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:58,383 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:58,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:58,384 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:58,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:46:58,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:46:58,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:46:58,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:46:59,138 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 01:46:59,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:46:59,342 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 01:46:59,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:46:59,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [713155435] [2021-11-07 01:46:59,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [713155435] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:46:59,343 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:46:59,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:46:59,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609696478] [2021-11-07 01:46:59,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:46:59,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:46:59,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:46:59,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:46:59,345 INFO L87 Difference]: Start difference. First operand 1177 states and 2099 transitions. Second operand has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 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 01:46:59,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:46:59,485 INFO L93 Difference]: Finished difference Result 2297 states and 4085 transitions. [2021-11-07 01:46:59,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:46:59,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 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 01:46:59,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:46:59,495 INFO L225 Difference]: With dead ends: 2297 [2021-11-07 01:46:59,496 INFO L226 Difference]: Without dead ends: 1366 [2021-11-07 01:46:59,500 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 134 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 01:46:59,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1366 states. [2021-11-07 01:46:59,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1366 to 1177. [2021-11-07 01:46:59,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1177 states, 1175 states have (on average 1.7846808510638297) internal successors, (2097), 1176 states have internal predecessors, (2097), 0 states have call successors, (0), 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 01:46:59,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1177 states to 1177 states and 2097 transitions. [2021-11-07 01:46:59,639 INFO L78 Accepts]: Start accepts. Automaton has 1177 states and 2097 transitions. Word has length 69 [2021-11-07 01:46:59,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:46:59,639 INFO L470 AbstractCegarLoop]: Abstraction has 1177 states and 2097 transitions. [2021-11-07 01:46:59,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 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 01:46:59,640 INFO L276 IsEmpty]: Start isEmpty. Operand 1177 states and 2097 transitions. [2021-11-07 01:46:59,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:46:59,647 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:46:59,648 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 01:46:59,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:46:59,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:46:59,863 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:46:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:46:59,864 INFO L85 PathProgramCache]: Analyzing trace with hash 782357296, now seen corresponding path program 1 times [2021-11-07 01:46:59,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:46:59,864 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1127446505] [2021-11-07 01:46:59,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:46:59,864 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:46:59,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:46:59,865 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:46:59,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:47:00,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:00,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:47:00,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:00,641 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 01:47:00,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:00,834 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 01:47:00,834 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:00,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1127446505] [2021-11-07 01:47:00,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1127446505] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:00,834 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:00,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:47:00,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57325498] [2021-11-07 01:47:00,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:47:00,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:00,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:47:00,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:47:00,836 INFO L87 Difference]: Start difference. First operand 1177 states and 2097 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 01:47:01,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:01,007 INFO L93 Difference]: Finished difference Result 3171 states and 5680 transitions. [2021-11-07 01:47:01,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:47:01,008 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 01:47:01,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:01,024 INFO L225 Difference]: With dead ends: 3171 [2021-11-07 01:47:01,025 INFO L226 Difference]: Without dead ends: 2090 [2021-11-07 01:47:01,027 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 01:47:01,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2021-11-07 01:47:01,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 1901. [2021-11-07 01:47:01,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1901 states, 1899 states have (on average 1.79884149552396) internal successors, (3416), 1900 states have internal predecessors, (3416), 0 states have call successors, (0), 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 01:47:01,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1901 states to 1901 states and 3416 transitions. [2021-11-07 01:47:01,197 INFO L78 Accepts]: Start accepts. Automaton has 1901 states and 3416 transitions. Word has length 69 [2021-11-07 01:47:01,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:01,198 INFO L470 AbstractCegarLoop]: Abstraction has 1901 states and 3416 transitions. [2021-11-07 01:47:01,198 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 01:47:01,198 INFO L276 IsEmpty]: Start isEmpty. Operand 1901 states and 3416 transitions. [2021-11-07 01:47:01,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:47:01,203 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:01,203 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 01:47:01,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:01,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:01,418 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:01,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:01,418 INFO L85 PathProgramCache]: Analyzing trace with hash 570724387, now seen corresponding path program 1 times [2021-11-07 01:47:01,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:01,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [630284871] [2021-11-07 01:47:01,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:01,420 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:01,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:01,422 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:01,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:47:02,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:02,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:47:02,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:02,254 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 01:47:02,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:02,446 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 01:47:02,446 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:02,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [630284871] [2021-11-07 01:47:02,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [630284871] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:02,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:02,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:47:02,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500571296] [2021-11-07 01:47:02,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:47:02,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:02,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:47:02,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:47:02,448 INFO L87 Difference]: Start difference. First operand 1901 states and 3416 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 01:47:02,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:02,683 INFO L93 Difference]: Finished difference Result 5079 states and 9156 transitions. [2021-11-07 01:47:02,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:47:02,684 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 01:47:02,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:02,712 INFO L225 Difference]: With dead ends: 5079 [2021-11-07 01:47:02,713 INFO L226 Difference]: Without dead ends: 3308 [2021-11-07 01:47:02,716 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 01:47:02,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3308 states. [2021-11-07 01:47:02,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3308 to 3119. [2021-11-07 01:47:02,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3119 states, 3117 states have (on average 1.8059031119666347) internal successors, (5629), 3118 states have internal predecessors, (5629), 0 states have call successors, (0), 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 01:47:02,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3119 states to 3119 states and 5629 transitions. [2021-11-07 01:47:02,979 INFO L78 Accepts]: Start accepts. Automaton has 3119 states and 5629 transitions. Word has length 70 [2021-11-07 01:47:02,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:02,980 INFO L470 AbstractCegarLoop]: Abstraction has 3119 states and 5629 transitions. [2021-11-07 01:47:02,980 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 01:47:02,980 INFO L276 IsEmpty]: Start isEmpty. Operand 3119 states and 5629 transitions. [2021-11-07 01:47:02,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:47:02,986 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:02,986 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 01:47:03,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:03,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:03,204 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:03,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:03,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1012814657, now seen corresponding path program 1 times [2021-11-07 01:47:03,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:03,205 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2040380783] [2021-11-07 01:47:03,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:03,206 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:03,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:03,207 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:03,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:47:03,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:03,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:47:03,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:04,080 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 01:47:04,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:04,283 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 01:47:04,283 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:04,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2040380783] [2021-11-07 01:47:04,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2040380783] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:04,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:04,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:47:04,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876239645] [2021-11-07 01:47:04,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:47:04,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:04,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:47:04,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:47:04,286 INFO L87 Difference]: Start difference. First operand 3119 states and 5629 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 01:47:04,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:04,649 INFO L93 Difference]: Finished difference Result 8449 states and 15278 transitions. [2021-11-07 01:47:04,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:47:04,650 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 01:47:04,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:04,692 INFO L225 Difference]: With dead ends: 8449 [2021-11-07 01:47:04,692 INFO L226 Difference]: Without dead ends: 5494 [2021-11-07 01:47:04,698 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 01:47:04,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5494 states. [2021-11-07 01:47:05,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5494 to 5305. [2021-11-07 01:47:05,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5305 states, 5303 states have (on average 1.808410333773336) internal successors, (9590), 5304 states have internal predecessors, (9590), 0 states have call successors, (0), 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 01:47:05,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5305 states to 5305 states and 9590 transitions. [2021-11-07 01:47:05,095 INFO L78 Accepts]: Start accepts. Automaton has 5305 states and 9590 transitions. Word has length 71 [2021-11-07 01:47:05,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:05,096 INFO L470 AbstractCegarLoop]: Abstraction has 5305 states and 9590 transitions. [2021-11-07 01:47:05,096 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 01:47:05,096 INFO L276 IsEmpty]: Start isEmpty. Operand 5305 states and 9590 transitions. [2021-11-07 01:47:05,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:47:05,105 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:05,106 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 01:47:05,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:05,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:05,323 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:05,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:05,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1955340901, now seen corresponding path program 1 times [2021-11-07 01:47:05,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:05,324 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762705515] [2021-11-07 01:47:05,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:05,325 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:05,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:05,328 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:05,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:47:06,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:06,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:06,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:06,377 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 01:47:06,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:06,640 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 01:47:06,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:06,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762705515] [2021-11-07 01:47:06,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762705515] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:06,641 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:06,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:47:06,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077713509] [2021-11-07 01:47:06,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:47:06,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:06,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:47:06,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:47:06,644 INFO L87 Difference]: Start difference. First operand 5305 states and 9590 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 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 01:47:09,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:09,787 INFO L93 Difference]: Finished difference Result 19860 states and 35941 transitions. [2021-11-07 01:47:09,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:47:09,788 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 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 01:47:09,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:09,872 INFO L225 Difference]: With dead ends: 19860 [2021-11-07 01:47:09,872 INFO L226 Difference]: Without dead ends: 14799 [2021-11-07 01:47:09,885 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 138 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 01:47:09,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14799 states. [2021-11-07 01:47:10,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14799 to 5255. [2021-11-07 01:47:10,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5255 states, 5253 states have (on average 1.7875499714448886) internal successors, (9390), 5254 states have internal predecessors, (9390), 0 states have call successors, (0), 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 01:47:10,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5255 states to 5255 states and 9390 transitions. [2021-11-07 01:47:10,594 INFO L78 Accepts]: Start accepts. Automaton has 5255 states and 9390 transitions. Word has length 72 [2021-11-07 01:47:10,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:10,594 INFO L470 AbstractCegarLoop]: Abstraction has 5255 states and 9390 transitions. [2021-11-07 01:47:10,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 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 01:47:10,595 INFO L276 IsEmpty]: Start isEmpty. Operand 5255 states and 9390 transitions. [2021-11-07 01:47:10,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:47:10,602 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:10,603 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, 1] [2021-11-07 01:47:10,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:10,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:10,819 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:10,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:10,819 INFO L85 PathProgramCache]: Analyzing trace with hash -998920620, now seen corresponding path program 1 times [2021-11-07 01:47:10,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:10,820 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [879998116] [2021-11-07 01:47:10,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:10,820 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:10,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:10,822 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:10,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:47:11,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:11,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:47:11,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:11,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:47:11,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:12,116 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 01:47:12,116 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:12,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [879998116] [2021-11-07 01:47:12,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [879998116] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:12,117 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:12,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:47:12,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510858316] [2021-11-07 01:47:12,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:47:12,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:12,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:47:12,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:47:12,119 INFO L87 Difference]: Start difference. First operand 5255 states and 9390 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 01:47:12,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:12,750 INFO L93 Difference]: Finished difference Result 15186 states and 27184 transitions. [2021-11-07 01:47:12,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:47:12,751 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 01:47:12,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:12,785 INFO L225 Difference]: With dead ends: 15186 [2021-11-07 01:47:12,786 INFO L226 Difference]: Without dead ends: 10102 [2021-11-07 01:47:12,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 141 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 01:47:12,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10102 states. [2021-11-07 01:47:13,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10102 to 9913. [2021-11-07 01:47:13,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9913 states, 9911 states have (on average 1.7886187064877408) internal successors, (17727), 9912 states have internal predecessors, (17727), 0 states have call successors, (0), 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 01:47:13,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9913 states to 9913 states and 17727 transitions. [2021-11-07 01:47:13,581 INFO L78 Accepts]: Start accepts. Automaton has 9913 states and 17727 transitions. Word has length 72 [2021-11-07 01:47:13,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:13,582 INFO L470 AbstractCegarLoop]: Abstraction has 9913 states and 17727 transitions. [2021-11-07 01:47:13,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 01:47:13,582 INFO L276 IsEmpty]: Start isEmpty. Operand 9913 states and 17727 transitions. [2021-11-07 01:47:13,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:47:13,591 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:13,592 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 01:47:13,617 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-07 01:47:13,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:13,807 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:13,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:13,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1568381280, now seen corresponding path program 1 times [2021-11-07 01:47:13,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:13,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1846333203] [2021-11-07 01:47:13,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:13,808 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:13,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:13,809 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:13,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:47:14,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:14,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:14,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:14,736 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 01:47:14,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:14,926 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 01:47:14,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:14,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1846333203] [2021-11-07 01:47:14,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1846333203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:14,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [830487229] [2021-11-07 01:47:14,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:14,927 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:14,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:14,929 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:14,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:47:15,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:15,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:47:15,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:16,128 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 01:47:16,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:16,464 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 01:47:16,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [830487229] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:16,465 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:16,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:47:16,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123223004] [2021-11-07 01:47:16,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:47:16,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:16,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:47:16,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:47:16,467 INFO L87 Difference]: Start difference. First operand 9913 states and 17727 transitions. Second operand has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 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 01:47:22,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:22,015 INFO L93 Difference]: Finished difference Result 58666 states and 105481 transitions. [2021-11-07 01:47:22,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 01:47:22,016 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 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 73 [2021-11-07 01:47:22,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:22,206 INFO L225 Difference]: With dead ends: 58666 [2021-11-07 01:47:22,206 INFO L226 Difference]: Without dead ends: 58495 [2021-11-07 01:47:22,225 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-07 01:47:22,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58495 states. [2021-11-07 01:47:24,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58495 to 19745. [2021-11-07 01:47:24,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19745 states, 19743 states have (on average 1.7889885022539633) internal successors, (35320), 19744 states have internal predecessors, (35320), 0 states have call successors, (0), 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 01:47:24,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19745 states to 19745 states and 35320 transitions. [2021-11-07 01:47:24,525 INFO L78 Accepts]: Start accepts. Automaton has 19745 states and 35320 transitions. Word has length 73 [2021-11-07 01:47:24,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:24,526 INFO L470 AbstractCegarLoop]: Abstraction has 19745 states and 35320 transitions. [2021-11-07 01:47:24,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 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 01:47:24,526 INFO L276 IsEmpty]: Start isEmpty. Operand 19745 states and 35320 transitions. [2021-11-07 01:47:24,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:47:24,547 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:24,547 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] [2021-11-07 01:47:24,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 01:47:24,764 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-07 01:47:24,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:24,953 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:24,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:24,953 INFO L85 PathProgramCache]: Analyzing trace with hash -1028884439, now seen corresponding path program 1 times [2021-11-07 01:47:24,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:24,954 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [849118799] [2021-11-07 01:47:24,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:24,954 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:24,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:24,955 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:24,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:47:25,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:25,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:25,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:25,935 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 01:47:25,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:26,150 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 01:47:26,151 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:26,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [849118799] [2021-11-07 01:47:26,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [849118799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:26,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1523461155] [2021-11-07 01:47:26,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:26,151 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:26,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:26,152 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:26,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:47:27,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:27,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:47:27,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:27,362 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 01:47:27,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:27,622 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 01:47:27,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1523461155] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:27,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:27,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:47:27,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369131866] [2021-11-07 01:47:27,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:47:27,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:27,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:47:27,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:47:27,625 INFO L87 Difference]: Start difference. First operand 19745 states and 35320 transitions. Second operand has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 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 01:47:30,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:30,873 INFO L93 Difference]: Finished difference Result 20097 states and 35904 transitions. [2021-11-07 01:47:30,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:47:30,874 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 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 74 [2021-11-07 01:47:30,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:30,914 INFO L225 Difference]: With dead ends: 20097 [2021-11-07 01:47:30,915 INFO L226 Difference]: Without dead ends: 19808 [2021-11-07 01:47:30,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:47:30,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19808 states. [2021-11-07 01:47:32,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19808 to 19739. [2021-11-07 01:47:32,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19739 states, 19737 states have (on average 1.788873689010488) internal successors, (35307), 19738 states have internal predecessors, (35307), 0 states have call successors, (0), 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 01:47:32,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19739 states to 19739 states and 35307 transitions. [2021-11-07 01:47:32,712 INFO L78 Accepts]: Start accepts. Automaton has 19739 states and 35307 transitions. Word has length 74 [2021-11-07 01:47:32,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:32,713 INFO L470 AbstractCegarLoop]: Abstraction has 19739 states and 35307 transitions. [2021-11-07 01:47:32,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 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 01:47:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 19739 states and 35307 transitions. [2021-11-07 01:47:32,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:47:32,730 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:32,730 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] [2021-11-07 01:47:32,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:32,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:33,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:33,137 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:33,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:33,137 INFO L85 PathProgramCache]: Analyzing trace with hash -181221421, now seen corresponding path program 1 times [2021-11-07 01:47:33,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:33,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [371433568] [2021-11-07 01:47:33,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:33,138 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:33,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:33,139 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:33,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:47:33,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:33,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:47:33,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:34,101 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 01:47:34,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:34,279 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 01:47:34,279 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:34,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [371433568] [2021-11-07 01:47:34,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [371433568] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:34,280 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:47:34,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:47:34,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341647338] [2021-11-07 01:47:34,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:47:34,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:34,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:47:34,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:47:34,282 INFO L87 Difference]: Start difference. First operand 19739 states and 35307 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 01:47:35,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:35,511 INFO L93 Difference]: Finished difference Result 38587 states and 69243 transitions. [2021-11-07 01:47:35,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:47:35,511 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 74 [2021-11-07 01:47:35,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:35,556 INFO L225 Difference]: With dead ends: 38587 [2021-11-07 01:47:35,556 INFO L226 Difference]: Without dead ends: 19095 [2021-11-07 01:47:35,580 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 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 01:47:35,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19095 states. [2021-11-07 01:47:36,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19095 to 9911. [2021-11-07 01:47:36,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9911 states, 9909 states have (on average 1.7880714501967907) internal successors, (17718), 9910 states have internal predecessors, (17718), 0 states have call successors, (0), 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 01:47:36,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9911 states to 9911 states and 17718 transitions. [2021-11-07 01:47:36,286 INFO L78 Accepts]: Start accepts. Automaton has 9911 states and 17718 transitions. Word has length 74 [2021-11-07 01:47:36,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:36,287 INFO L470 AbstractCegarLoop]: Abstraction has 9911 states and 17718 transitions. [2021-11-07 01:47:36,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 01:47:36,287 INFO L276 IsEmpty]: Start isEmpty. Operand 9911 states and 17718 transitions. [2021-11-07 01:47:36,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:47:36,296 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:36,296 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 01:47:36,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:36,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:47:36,511 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:36,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:36,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1892582953, now seen corresponding path program 1 times [2021-11-07 01:47:36,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:36,512 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [753916170] [2021-11-07 01:47:36,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:36,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:36,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:36,513 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:36,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:47:37,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:37,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:37,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:37,634 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 01:47:37,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:37,862 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 01:47:37,862 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:37,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [753916170] [2021-11-07 01:47:37,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [753916170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:37,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1850885498] [2021-11-07 01:47:37,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:37,863 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:37,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:37,864 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:37,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:47:39,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:39,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:47:39,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:39,268 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 01:47:39,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:39,434 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 01:47:39,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1850885498] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:39,435 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:39,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 13 [2021-11-07 01:47:39,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709189077] [2021-11-07 01:47:39,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:47:39,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:39,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:47:39,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:47:39,437 INFO L87 Difference]: Start difference. First operand 9911 states and 17718 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 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 01:47:40,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:40,056 INFO L93 Difference]: Finished difference Result 10043 states and 17932 transitions. [2021-11-07 01:47:40,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:47:40,056 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 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 76 [2021-11-07 01:47:40,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:40,073 INFO L225 Difference]: With dead ends: 10043 [2021-11-07 01:47:40,073 INFO L226 Difference]: Without dead ends: 9911 [2021-11-07 01:47:40,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:47:40,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9911 states. [2021-11-07 01:47:40,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9911 to 9911. [2021-11-07 01:47:40,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9911 states, 9909 states have (on average 1.7878696134826926) internal successors, (17716), 9910 states have internal predecessors, (17716), 0 states have call successors, (0), 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 01:47:40,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9911 states to 9911 states and 17716 transitions. [2021-11-07 01:47:40,855 INFO L78 Accepts]: Start accepts. Automaton has 9911 states and 17716 transitions. Word has length 76 [2021-11-07 01:47:40,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:40,855 INFO L470 AbstractCegarLoop]: Abstraction has 9911 states and 17716 transitions. [2021-11-07 01:47:40,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 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 01:47:40,856 INFO L276 IsEmpty]: Start isEmpty. Operand 9911 states and 17716 transitions. [2021-11-07 01:47:40,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:47:40,865 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:40,866 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] [2021-11-07 01:47:40,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:41,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:41,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:41,284 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:41,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:41,285 INFO L85 PathProgramCache]: Analyzing trace with hash -361093636, now seen corresponding path program 1 times [2021-11-07 01:47:41,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:41,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [251974433] [2021-11-07 01:47:41,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:41,285 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:41,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:41,286 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:41,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:47:42,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:42,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:42,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:42,410 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 01:47:42,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:42,628 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 01:47:42,629 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:42,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [251974433] [2021-11-07 01:47:42,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [251974433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:42,629 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [810172983] [2021-11-07 01:47:42,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:42,629 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:42,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:42,630 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:42,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:47:43,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:43,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:47:43,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:44,108 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 01:47:44,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:44,348 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 01:47:44,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [810172983] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:44,349 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:44,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:47:44,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563419800] [2021-11-07 01:47:44,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:47:44,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:44,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:47:44,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:47:44,352 INFO L87 Difference]: Start difference. First operand 9911 states and 17716 transitions. Second operand has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:47:47,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:47,760 INFO L93 Difference]: Finished difference Result 10690 states and 18962 transitions. [2021-11-07 01:47:47,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 01:47:47,762 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:47:47,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:47,778 INFO L225 Difference]: With dead ends: 10690 [2021-11-07 01:47:47,778 INFO L226 Difference]: Without dead ends: 10558 [2021-11-07 01:47:47,782 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:47:47,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10558 states. [2021-11-07 01:47:48,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10558 to 10041. [2021-11-07 01:47:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10041 states, 10039 states have (on average 1.785636019523857) internal successors, (17926), 10040 states have internal predecessors, (17926), 0 states have call successors, (0), 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 01:47:48,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10041 states to 10041 states and 17926 transitions. [2021-11-07 01:47:48,787 INFO L78 Accepts]: Start accepts. Automaton has 10041 states and 17926 transitions. Word has length 79 [2021-11-07 01:47:48,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:48,788 INFO L470 AbstractCegarLoop]: Abstraction has 10041 states and 17926 transitions. [2021-11-07 01:47:48,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:47:48,788 INFO L276 IsEmpty]: Start isEmpty. Operand 10041 states and 17926 transitions. [2021-11-07 01:47:48,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:47:48,802 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:48,802 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] [2021-11-07 01:47:48,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:49,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:49,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:49,215 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:49,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:49,216 INFO L85 PathProgramCache]: Analyzing trace with hash 707777419, now seen corresponding path program 1 times [2021-11-07 01:47:49,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:49,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1416961643] [2021-11-07 01:47:49,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:49,217 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:49,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:49,218 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:49,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:47:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:50,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:50,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:50,512 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 01:47:50,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:50,758 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 01:47:50,759 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:50,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1416961643] [2021-11-07 01:47:50,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1416961643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:50,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1267547135] [2021-11-07 01:47:50,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:50,759 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:50,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:50,761 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:50,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:47:52,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:52,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:47:52,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:52,382 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 01:47:52,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:52,571 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 01:47:52,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1267547135] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:52,572 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:52,572 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:47:52,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782449655] [2021-11-07 01:47:52,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:47:52,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:52,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:47:52,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:47:52,573 INFO L87 Difference]: Start difference. First operand 10041 states and 17926 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 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 01:47:53,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:53,212 INFO L93 Difference]: Finished difference Result 10177 states and 18147 transitions. [2021-11-07 01:47:53,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:47:53,213 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 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 80 [2021-11-07 01:47:53,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:53,226 INFO L225 Difference]: With dead ends: 10177 [2021-11-07 01:47:53,226 INFO L226 Difference]: Without dead ends: 9981 [2021-11-07 01:47:53,229 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 306 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 01:47:53,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9981 states. [2021-11-07 01:47:53,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9981 to 9914. [2021-11-07 01:47:53,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9914 states, 9912 states have (on average 1.7874293785310735) internal successors, (17717), 9913 states have internal predecessors, (17717), 0 states have call successors, (0), 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 01:47:53,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9914 states to 9914 states and 17717 transitions. [2021-11-07 01:47:53,954 INFO L78 Accepts]: Start accepts. Automaton has 9914 states and 17717 transitions. Word has length 80 [2021-11-07 01:47:53,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:53,954 INFO L470 AbstractCegarLoop]: Abstraction has 9914 states and 17717 transitions. [2021-11-07 01:47:53,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 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 01:47:53,955 INFO L276 IsEmpty]: Start isEmpty. Operand 9914 states and 17717 transitions. [2021-11-07 01:47:53,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:47:53,961 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:53,962 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] [2021-11-07 01:47:53,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:54,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:54,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:54,375 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:54,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:54,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1345850947, now seen corresponding path program 1 times [2021-11-07 01:47:54,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:54,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1396413974] [2021-11-07 01:47:54,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:54,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:54,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:54,379 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:54,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:47:55,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:55,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:47:55,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:55,688 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 01:47:55,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:55,944 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 01:47:55,944 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:47:55,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1396413974] [2021-11-07 01:47:55,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1396413974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:47:55,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1207397884] [2021-11-07 01:47:55,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:55,944 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:55,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:47:55,945 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:47:55,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:47:57,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:47:57,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:47:57,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:47:57,798 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 01:47:57,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:47:57,987 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 01:47:57,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1207397884] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:47:57,987 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:47:57,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:47:57,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515272738] [2021-11-07 01:47:57,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:47:57,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:47:57,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:47:57,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:47:57,989 INFO L87 Difference]: Start difference. First operand 9914 states and 17717 transitions. Second operand has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 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 01:47:58,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:47:58,868 INFO L93 Difference]: Finished difference Result 10156 states and 18109 transitions. [2021-11-07 01:47:58,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:47:58,869 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 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 80 [2021-11-07 01:47:58,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:47:58,883 INFO L225 Difference]: With dead ends: 10156 [2021-11-07 01:47:58,883 INFO L226 Difference]: Without dead ends: 9995 [2021-11-07 01:47:58,887 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:47:58,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9995 states. [2021-11-07 01:47:59,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9995 to 9911. [2021-11-07 01:47:59,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9911 states, 9909 states have (on average 1.7873650216974468) internal successors, (17711), 9910 states have internal predecessors, (17711), 0 states have call successors, (0), 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 01:47:59,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9911 states to 9911 states and 17711 transitions. [2021-11-07 01:47:59,533 INFO L78 Accepts]: Start accepts. Automaton has 9911 states and 17711 transitions. Word has length 80 [2021-11-07 01:47:59,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:47:59,533 INFO L470 AbstractCegarLoop]: Abstraction has 9911 states and 17711 transitions. [2021-11-07 01:47:59,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 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 01:47:59,533 INFO L276 IsEmpty]: Start isEmpty. Operand 9911 states and 17711 transitions. [2021-11-07 01:47:59,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:47:59,542 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:47:59,542 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] [2021-11-07 01:47:59,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:47:59,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-07 01:47:59,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:47:59,979 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:47:59,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:47:59,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1220501568, now seen corresponding path program 1 times [2021-11-07 01:47:59,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:47:59,981 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [384790304] [2021-11-07 01:47:59,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:47:59,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:47:59,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:47:59,983 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:47:59,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:48:01,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:01,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:48:01,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:01,433 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 01:48:01,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:01,735 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 01:48:01,735 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:48:01,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [384790304] [2021-11-07 01:48:01,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [384790304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:48:01,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1955661961] [2021-11-07 01:48:01,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:01,735 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:01,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:48:01,748 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:48:01,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:48:03,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:03,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:48:03,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:04,178 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 01:48:04,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:04,662 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 01:48:04,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1955661961] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:48:04,662 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:48:04,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:48:04,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102971470] [2021-11-07 01:48:04,663 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:48:04,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:48:04,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:48:04,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:48:04,665 INFO L87 Difference]: Start difference. First operand 9911 states and 17711 transitions. Second operand has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 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 01:48:24,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:48:24,958 INFO L93 Difference]: Finished difference Result 31285 states and 55521 transitions. [2021-11-07 01:48:24,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-07 01:48:24,961 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 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 86 [2021-11-07 01:48:24,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:48:25,005 INFO L225 Difference]: With dead ends: 31285 [2021-11-07 01:48:25,005 INFO L226 Difference]: Without dead ends: 31140 [2021-11-07 01:48:25,011 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=710, Invalid=2482, Unknown=0, NotChecked=0, Total=3192 [2021-11-07 01:48:25,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31140 states. [2021-11-07 01:48:26,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31140 to 19918. [2021-11-07 01:48:26,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19918 states, 19916 states have (on average 1.7864028921470174) internal successors, (35578), 19917 states have internal predecessors, (35578), 0 states have call successors, (0), 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 01:48:26,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19918 states to 19918 states and 35578 transitions. [2021-11-07 01:48:26,405 INFO L78 Accepts]: Start accepts. Automaton has 19918 states and 35578 transitions. Word has length 86 [2021-11-07 01:48:26,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:48:26,406 INFO L470 AbstractCegarLoop]: Abstraction has 19918 states and 35578 transitions. [2021-11-07 01:48:26,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 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 01:48:26,406 INFO L276 IsEmpty]: Start isEmpty. Operand 19918 states and 35578 transitions. [2021-11-07 01:48:26,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:48:26,423 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:48:26,424 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] [2021-11-07 01:48:26,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:26,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:26,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:48:26,826 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:48:26,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:48:26,827 INFO L85 PathProgramCache]: Analyzing trace with hash 415153677, now seen corresponding path program 1 times [2021-11-07 01:48:26,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:48:26,827 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [537445845] [2021-11-07 01:48:26,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:26,828 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:48:26,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:48:26,829 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:48:26,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:48:28,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:28,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:48:28,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:28,434 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 01:48:28,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:28,696 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 01:48:28,696 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:48:28,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [537445845] [2021-11-07 01:48:28,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [537445845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:48:28,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1170262422] [2021-11-07 01:48:28,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:28,697 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:28,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:48:28,698 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:48:28,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:48:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:30,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:48:30,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:30,763 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 01:48:30,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:30,984 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 01:48:30,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1170262422] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:48:30,984 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:48:30,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 01:48:30,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881528989] [2021-11-07 01:48:30,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:48:30,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:48:30,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:48:30,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:48:30,985 INFO L87 Difference]: Start difference. First operand 19918 states and 35578 transitions. Second operand has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 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 01:48:32,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:48:32,393 INFO L93 Difference]: Finished difference Result 20497 states and 36504 transitions. [2021-11-07 01:48:32,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:48:32,394 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 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 87 [2021-11-07 01:48:32,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:48:32,424 INFO L225 Difference]: With dead ends: 20497 [2021-11-07 01:48:32,424 INFO L226 Difference]: Without dead ends: 20019 [2021-11-07 01:48:32,429 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-07 01:48:32,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20019 states. [2021-11-07 01:48:33,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20019 to 19914. [2021-11-07 01:48:33,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19914 states, 19912 states have (on average 1.7861088790678987) internal successors, (35565), 19913 states have internal predecessors, (35565), 0 states have call successors, (0), 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 01:48:33,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19914 states to 19914 states and 35565 transitions. [2021-11-07 01:48:33,717 INFO L78 Accepts]: Start accepts. Automaton has 19914 states and 35565 transitions. Word has length 87 [2021-11-07 01:48:33,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:48:33,717 INFO L470 AbstractCegarLoop]: Abstraction has 19914 states and 35565 transitions. [2021-11-07 01:48:33,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 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 01:48:33,718 INFO L276 IsEmpty]: Start isEmpty. Operand 19914 states and 35565 transitions. [2021-11-07 01:48:33,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:48:33,729 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:48:33,730 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] [2021-11-07 01:48:33,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:33,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:34,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:34,131 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:48:34,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:48:34,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1627157152, now seen corresponding path program 1 times [2021-11-07 01:48:34,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:48:34,132 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1238729781] [2021-11-07 01:48:34,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:34,132 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:48:34,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:48:34,133 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:48:34,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:48:35,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:35,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:48:35,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:35,766 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 01:48:35,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:36,024 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 01:48:36,025 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:48:36,025 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1238729781] [2021-11-07 01:48:36,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1238729781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:48:36,025 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [624439335] [2021-11-07 01:48:36,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:36,026 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:36,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:48:36,027 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:48:36,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:48:37,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:37,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:48:37,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:38,270 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 01:48:38,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:38,606 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 01:48:38,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [624439335] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:48:38,606 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:48:38,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:48:38,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415673726] [2021-11-07 01:48:38,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:48:38,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:48:38,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:48:38,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:48:38,608 INFO L87 Difference]: Start difference. First operand 19914 states and 35565 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 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 01:48:41,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:48:41,988 INFO L93 Difference]: Finished difference Result 20240 states and 36090 transitions. [2021-11-07 01:48:41,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:48:41,988 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 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 87 [2021-11-07 01:48:41,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:48:42,019 INFO L225 Difference]: With dead ends: 20240 [2021-11-07 01:48:42,020 INFO L226 Difference]: Without dead ends: 19912 [2021-11-07 01:48:42,026 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 334 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 01:48:42,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19912 states. [2021-11-07 01:48:43,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19912 to 19803. [2021-11-07 01:48:43,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19803 states, 19801 states have (on average 1.7869804555325488) internal successors, (35384), 19802 states have internal predecessors, (35384), 0 states have call successors, (0), 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 01:48:43,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19803 states to 19803 states and 35384 transitions. [2021-11-07 01:48:43,493 INFO L78 Accepts]: Start accepts. Automaton has 19803 states and 35384 transitions. Word has length 87 [2021-11-07 01:48:43,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:48:43,493 INFO L470 AbstractCegarLoop]: Abstraction has 19803 states and 35384 transitions. [2021-11-07 01:48:43,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 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 01:48:43,493 INFO L276 IsEmpty]: Start isEmpty. Operand 19803 states and 35384 transitions. [2021-11-07 01:48:43,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 01:48:43,506 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:48:43,506 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] [2021-11-07 01:48:43,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:43,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:43,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:48:43,907 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:48:43,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:48:43,907 INFO L85 PathProgramCache]: Analyzing trace with hash 1029803697, now seen corresponding path program 1 times [2021-11-07 01:48:43,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:48:43,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [184160818] [2021-11-07 01:48:43,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:43,908 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:48:43,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:48:43,909 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:48:43,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:48:45,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:45,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:48:45,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:45,593 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 01:48:45,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:45,905 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 01:48:45,905 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:48:45,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [184160818] [2021-11-07 01:48:45,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [184160818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:48:45,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [130329483] [2021-11-07 01:48:45,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:45,906 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:45,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:48:45,907 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:48:45,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:48:47,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:47,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:48:47,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:48,243 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 01:48:48,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:48,458 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 01:48:48,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [130329483] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:48:48,458 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:48:48,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:48:48,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288827865] [2021-11-07 01:48:48,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:48:48,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:48:48,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:48:48,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:48:48,460 INFO L87 Difference]: Start difference. First operand 19803 states and 35384 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 01:48:50,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:48:50,059 INFO L93 Difference]: Finished difference Result 20326 states and 36227 transitions. [2021-11-07 01:48:50,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:48:50,060 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 88 [2021-11-07 01:48:50,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:48:50,090 INFO L225 Difference]: With dead ends: 20326 [2021-11-07 01:48:50,090 INFO L226 Difference]: Without dead ends: 20020 [2021-11-07 01:48:50,097 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=165, Invalid=591, Unknown=0, NotChecked=0, Total=756 [2021-11-07 01:48:50,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20020 states. [2021-11-07 01:48:51,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20020 to 19798. [2021-11-07 01:48:51,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19798 states, 19796 states have (on average 1.786876136593251) internal successors, (35373), 19797 states have internal predecessors, (35373), 0 states have call successors, (0), 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 01:48:51,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19798 states to 19798 states and 35373 transitions. [2021-11-07 01:48:51,582 INFO L78 Accepts]: Start accepts. Automaton has 19798 states and 35373 transitions. Word has length 88 [2021-11-07 01:48:51,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:48:51,582 INFO L470 AbstractCegarLoop]: Abstraction has 19798 states and 35373 transitions. [2021-11-07 01:48:51,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 01:48:51,582 INFO L276 IsEmpty]: Start isEmpty. Operand 19798 states and 35373 transitions. [2021-11-07 01:48:51,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 01:48:51,594 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:48:51,594 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] [2021-11-07 01:48:51,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:51,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:48:51,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:48:51,995 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:48:51,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:48:51,996 INFO L85 PathProgramCache]: Analyzing trace with hash -384308186, now seen corresponding path program 1 times [2021-11-07 01:48:51,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:48:51,996 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1253085497] [2021-11-07 01:48:51,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:51,997 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:48:51,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:48:51,997 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:48:51,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 01:48:53,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:53,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:48:53,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:53,720 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 01:48:53,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:53,980 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 01:48:53,980 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:48:53,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1253085497] [2021-11-07 01:48:53,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1253085497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:48:53,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1887552386] [2021-11-07 01:48:53,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:48:53,981 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:48:53,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:48:53,982 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:48:53,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 01:48:55,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:48:55,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:48:55,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:48:56,322 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 01:48:56,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:48:56,590 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 01:48:56,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1887552386] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:48:56,590 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:48:56,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:48:56,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881265415] [2021-11-07 01:48:56,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:48:56,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:48:56,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:48:56,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:48:56,592 INFO L87 Difference]: Start difference. First operand 19798 states and 35373 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 01:49:03,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:49:03,376 INFO L93 Difference]: Finished difference Result 22729 states and 39899 transitions. [2021-11-07 01:49:03,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:49:03,378 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 88 [2021-11-07 01:49:03,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:49:03,409 INFO L225 Difference]: With dead ends: 22729 [2021-11-07 01:49:03,409 INFO L226 Difference]: Without dead ends: 22435 [2021-11-07 01:49:03,415 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=326, Invalid=1156, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 01:49:03,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22435 states. [2021-11-07 01:49:04,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22435 to 20099. [2021-11-07 01:49:04,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20099 states, 20097 states have (on average 1.782405334129472) internal successors, (35821), 20098 states have internal predecessors, (35821), 0 states have call successors, (0), 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 01:49:04,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20099 states to 20099 states and 35821 transitions. [2021-11-07 01:49:04,968 INFO L78 Accepts]: Start accepts. Automaton has 20099 states and 35821 transitions. Word has length 88 [2021-11-07 01:49:04,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:49:04,968 INFO L470 AbstractCegarLoop]: Abstraction has 20099 states and 35821 transitions. [2021-11-07 01:49:04,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 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 01:49:04,969 INFO L276 IsEmpty]: Start isEmpty. Operand 20099 states and 35821 transitions. [2021-11-07 01:49:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 01:49:04,981 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:49:04,981 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] [2021-11-07 01:49:04,989 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-07 01:49:05,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:49:05,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:49:05,389 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:49:05,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:49:05,389 INFO L85 PathProgramCache]: Analyzing trace with hash -374370406, now seen corresponding path program 1 times [2021-11-07 01:49:05,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:49:05,390 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1451013006] [2021-11-07 01:49:05,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:49:05,390 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:49:05,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:49:05,392 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:49:05,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:49:06,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:49:06,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:49:06,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:49:07,160 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 01:49:07,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:49:07,404 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 01:49:07,404 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:49:07,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1451013006] [2021-11-07 01:49:07,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1451013006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:49:07,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2013360222] [2021-11-07 01:49:07,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:49:07,404 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:49:07,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:49:07,405 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:49:07,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 01:49:09,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:49:09,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:49:09,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:49:10,337 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 01:49:10,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:49:10,780 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 01:49:10,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2013360222] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:49:10,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:49:10,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:49:10,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027675506] [2021-11-07 01:49:10,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:49:10,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:49:10,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:49:10,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:49:10,782 INFO L87 Difference]: Start difference. First operand 20099 states and 35821 transitions. Second operand has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 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 01:49:30,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:49:30,172 INFO L93 Difference]: Finished difference Result 53203 states and 93990 transitions. [2021-11-07 01:49:30,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 01:49:30,172 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 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 88 [2021-11-07 01:49:30,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:49:30,256 INFO L225 Difference]: With dead ends: 53203 [2021-11-07 01:49:30,256 INFO L226 Difference]: Without dead ends: 52708 [2021-11-07 01:49:30,265 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 480 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=619, Invalid=2137, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 01:49:30,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52708 states. [2021-11-07 01:49:32,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52708 to 39888. [2021-11-07 01:49:32,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39888 states, 39886 states have (on average 1.7832572832572833) internal successors, (71127), 39887 states have internal predecessors, (71127), 0 states have call successors, (0), 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 01:49:33,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39888 states to 39888 states and 71127 transitions. [2021-11-07 01:49:33,063 INFO L78 Accepts]: Start accepts. Automaton has 39888 states and 71127 transitions. Word has length 88 [2021-11-07 01:49:33,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:49:33,063 INFO L470 AbstractCegarLoop]: Abstraction has 39888 states and 71127 transitions. [2021-11-07 01:49:33,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 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 01:49:33,064 INFO L276 IsEmpty]: Start isEmpty. Operand 39888 states and 71127 transitions. [2021-11-07 01:49:33,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:49:33,111 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:49:33,112 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] [2021-11-07 01:49:33,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-07 01:49:33,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-07 01:49:33,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:49:33,527 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:49:33,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:49:33,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1517852105, now seen corresponding path program 1 times [2021-11-07 01:49:33,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:49:33,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176017391] [2021-11-07 01:49:33,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:49:33,528 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:49:33,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:49:33,529 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:49:33,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-07 01:49:35,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:49:35,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:49:35,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:49:35,248 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 01:49:35,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:49:35,476 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 01:49:35,476 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:49:35,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176017391] [2021-11-07 01:49:35,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176017391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:49:35,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1056295121] [2021-11-07 01:49:35,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:49:35,476 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:49:35,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:49:35,483 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:49:35,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-07 01:49:37,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:49:37,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:49:37,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:49:38,242 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 01:49:38,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:49:38,682 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 01:49:38,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1056295121] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:49:38,682 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:49:38,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:49:38,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092621639] [2021-11-07 01:49:38,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:49:38,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:49:38,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:49:38,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:49:38,684 INFO L87 Difference]: Start difference. First operand 39888 states and 71127 transitions. Second operand has 18 states, 18 states have (on average 8.444444444444445) internal successors, (152), 17 states have internal predecessors, (152), 0 states have call successors, (0), 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 01:50:01,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:01,739 INFO L93 Difference]: Finished difference Result 95431 states and 168589 transitions. [2021-11-07 01:50:01,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 01:50:01,739 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.444444444444445) internal successors, (152), 17 states have internal predecessors, (152), 0 states have call successors, (0), 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 89 [2021-11-07 01:50:01,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:01,904 INFO L225 Difference]: With dead ends: 95431 [2021-11-07 01:50:01,904 INFO L226 Difference]: Without dead ends: 94427 [2021-11-07 01:50:01,922 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 480 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=619, Invalid=2137, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 01:50:02,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94427 states. [2021-11-07 01:50:07,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94427 to 79227. [2021-11-07 01:50:07,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79227 states, 79225 states have (on average 1.783704638687283) internal successors, (141314), 79226 states have internal predecessors, (141314), 0 states have call successors, (0), 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 01:50:08,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79227 states to 79227 states and 141314 transitions. [2021-11-07 01:50:08,230 INFO L78 Accepts]: Start accepts. Automaton has 79227 states and 141314 transitions. Word has length 89 [2021-11-07 01:50:08,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:50:08,230 INFO L470 AbstractCegarLoop]: Abstraction has 79227 states and 141314 transitions. [2021-11-07 01:50:08,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.444444444444445) internal successors, (152), 17 states have internal predecessors, (152), 0 states have call successors, (0), 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 01:50:08,231 INFO L276 IsEmpty]: Start isEmpty. Operand 79227 states and 141314 transitions. [2021-11-07 01:50:08,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:50:08,287 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:50:08,288 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] [2021-11-07 01:50:08,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:08,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-07 01:50:08,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:50:08,689 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:50:08,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:50:08,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1497251513, now seen corresponding path program 1 times [2021-11-07 01:50:08,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:50:08,690 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1820470635] [2021-11-07 01:50:08,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:08,691 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:50:08,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:50:08,691 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:50:08,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-07 01:50:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:10,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:50:10,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:10,808 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 01:50:10,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:11,042 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 01:50:11,042 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:50:11,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1820470635] [2021-11-07 01:50:11,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1820470635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:50:11,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [847766876] [2021-11-07 01:50:11,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:50:11,043 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:50:11,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:50:11,044 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:50:11,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1008944e-25f6-4322-bfb1-dbef902010d3/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-07 01:50:13,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:50:13,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:50:13,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:50:13,545 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 01:50:13,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:50:13,796 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 01:50:13,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [847766876] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:50:13,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:50:13,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 01:50:13,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221048354] [2021-11-07 01:50:13,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:50:13,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:50:13,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:50:13,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:50:13,798 INFO L87 Difference]: Start difference. First operand 79227 states and 141314 transitions. Second operand has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:50:22,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:50:22,636 INFO L93 Difference]: Finished difference Result 90385 states and 158562 transitions. [2021-11-07 01:50:22,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:50:22,637 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-07 01:50:22,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:50:22,786 INFO L225 Difference]: With dead ends: 90385 [2021-11-07 01:50:22,786 INFO L226 Difference]: Without dead ends: 88574 [2021-11-07 01:50:22,805 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:50:22,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88574 states.