./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec4_product34.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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product34.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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 82e24cc91d79ad041473748268d13bac909e458d30ed1ab080cccaeb5ccb7cec --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:53:16,554 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:53:16,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:53:16,610 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:53:16,611 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:53:16,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:53:16,617 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:53:16,621 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:53:16,623 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:53:16,629 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:53:16,630 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:53:16,632 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:53:16,633 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:53:16,636 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:53:16,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:53:16,643 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:53:16,645 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:53:16,647 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:53:16,649 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:53:16,657 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:53:16,659 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:53:16,660 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:53:16,663 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:53:16,664 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:53:16,673 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:53:16,674 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:53:16,674 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:53:16,676 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:53:16,677 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:53:16,678 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:53:16,679 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:53:16,680 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:53:16,682 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:53:16,683 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:53:16,685 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:53:16,685 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:53:16,686 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:53:16,686 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:53:16,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:53:16,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:53:16,688 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:53:16,689 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:53:16,730 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:53:16,731 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:53:16,732 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:53:16,733 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:53:16,733 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:53:16,733 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:53:16,733 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:53:16,734 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:53:16,734 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:53:16,734 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:53:16,735 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:53:16,735 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:53:16,736 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:53:16,736 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:53:16,736 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:53:16,737 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:53:16,737 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:53:16,737 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:53:16,738 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:53:16,738 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:53:16,738 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:53:16,738 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:53:16,738 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:53:16,739 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:53:16,739 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:53:16,739 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:53:16,739 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:53:16,740 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:53:16,740 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:53:16,740 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:53:16,740 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:16,740 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:53:16,741 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:53:16,741 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:53:16,741 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:53:16,741 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:53:16,742 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:53:16,742 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:53:16,742 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:53:16,742 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 82e24cc91d79ad041473748268d13bac909e458d30ed1ab080cccaeb5ccb7cec [2021-11-07 00:53:17,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:53:17,090 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:53:17,092 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:53:17,093 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:53:17,094 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:53:17,095 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product34.cil.c [2021-11-07 00:53:17,165 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/a7cce64e8/0af4c11504f74d3eb4ce9a9f1c936bb2/FLAGbb5e0da05 [2021-11-07 00:53:17,812 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:53:17,813 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c [2021-11-07 00:53:17,843 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/a7cce64e8/0af4c11504f74d3eb4ce9a9f1c936bb2/FLAGbb5e0da05 [2021-11-07 00:53:17,991 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/a7cce64e8/0af4c11504f74d3eb4ce9a9f1c936bb2 [2021-11-07 00:53:17,995 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:53:17,997 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:53:18,001 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:18,001 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:53:18,018 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:53:18,019 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:17" (1/1) ... [2021-11-07 00:53:18,020 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47a1b3e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:18, skipping insertion in model container [2021-11-07 00:53:18,020 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:17" (1/1) ... [2021-11-07 00:53:18,027 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:53:18,113 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:53:18,323 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c[1542,1555] [2021-11-07 00:53:18,749 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:18,762 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 00:53:18,763 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@69221183 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:18, skipping insertion in model container [2021-11-07 00:53:18,763 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:18,764 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:53:18,766 INFO L168 Benchmark]: Toolchain (without parser) took 767.80 ms. Allocated memory is still 86.0 MB. Free memory was 61.5 MB in the beginning and 46.7 MB in the end (delta: 14.9 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:53:18,766 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 86.0 MB. Free memory is still 61.9 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:53:18,767 INFO L168 Benchmark]: CACSL2BoogieTranslator took 762.79 ms. Allocated memory is still 86.0 MB. Free memory was 61.3 MB in the beginning and 46.9 MB in the end (delta: 14.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:53:18,769 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 86.0 MB. Free memory is still 61.9 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 762.79 ms. Allocated memory is still 86.0 MB. Free memory was 61.3 MB in the beginning and 46.9 MB in the end (delta: 14.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 2735]: 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product34.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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 82e24cc91d79ad041473748268d13bac909e458d30ed1ab080cccaeb5ccb7cec --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:53:21,017 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:53:21,019 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:53:21,050 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:53:21,051 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:53:21,052 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:53:21,054 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:53:21,056 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:53:21,058 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:53:21,059 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:53:21,060 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:53:21,062 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:53:21,062 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:53:21,064 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:53:21,068 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:53:21,070 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:53:21,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:53:21,072 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:53:21,074 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:53:21,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:53:21,078 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:53:21,083 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:53:21,086 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:53:21,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:53:21,102 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:53:21,103 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:53:21,103 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:53:21,104 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:53:21,105 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:53:21,106 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:53:21,106 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:53:21,107 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:53:21,108 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:53:21,109 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:53:21,110 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:53:21,111 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:53:21,111 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:53:21,112 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:53:21,115 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:53:21,117 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:53:21,118 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:53:21,119 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:53:21,168 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:53:21,169 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:53:21,170 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:53:21,170 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:53:21,170 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:53:21,171 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:53:21,171 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:53:21,171 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:53:21,171 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:53:21,172 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:53:21,173 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:53:21,174 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:53:21,175 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:53:21,175 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:53:21,175 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:53:21,175 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:53:21,175 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:53:21,176 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:53:21,176 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:53:21,176 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:53:21,176 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:53:21,176 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:21,177 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:53:21,177 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:53:21,177 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:53:21,177 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:53:21,177 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:53:21,177 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:53:21,178 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:53:21,178 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:53:21,178 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 82e24cc91d79ad041473748268d13bac909e458d30ed1ab080cccaeb5ccb7cec [2021-11-07 00:53:21,561 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:53:21,587 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:53:21,591 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:53:21,592 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:53:21,593 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:53:21,594 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product34.cil.c [2021-11-07 00:53:21,665 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/e65ab9006/75de5c0b447b48cf8e327b05c1a40cfb/FLAG633bd57c6 [2021-11-07 00:53:22,419 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:53:22,420 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c [2021-11-07 00:53:22,444 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/e65ab9006/75de5c0b447b48cf8e327b05c1a40cfb/FLAG633bd57c6 [2021-11-07 00:53:22,574 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/data/e65ab9006/75de5c0b447b48cf8e327b05c1a40cfb [2021-11-07 00:53:22,577 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:53:22,579 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:53:22,581 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:22,581 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:53:22,598 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:53:22,599 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:22" (1/1) ... [2021-11-07 00:53:22,600 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@526c6373 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:22, skipping insertion in model container [2021-11-07 00:53:22,600 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:22" (1/1) ... [2021-11-07 00:53:22,607 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:53:22,692 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:53:22,849 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c[1542,1555] [2021-11-07 00:53:23,348 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:23,362 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:53:23,382 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:53:23,385 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c[1542,1555] [2021-11-07 00:53:23,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:23,546 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:53:23,559 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_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/sv-benchmarks/c/product-lines/email_spec4_product34.cil.c[1542,1555] [2021-11-07 00:53:23,667 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:23,705 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:53:23,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23 WrapperNode [2021-11-07 00:53:23,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:23,707 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:23,707 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:53:23,707 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:53:23,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:23,749 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:23,937 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:23,938 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:53:23,938 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:53:23,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:53:23,946 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:23,946 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:23,960 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:23,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:24,052 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:24,160 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:24,193 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:24,234 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:53:24,241 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:53:24,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:53:24,243 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:53:24,244 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (1/1) ... [2021-11-07 00:53:24,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:24,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:24,278 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:53:24,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:53:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:53:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:53:24,332 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:53:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:53:24,333 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:53:30,788 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:53:30,788 INFO L299 CfgBuilder]: Removed 849 assume(true) statements. [2021-11-07 00:53:30,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:30 BoogieIcfgContainer [2021-11-07 00:53:30,808 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:53:30,810 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:53:30,810 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:53:30,813 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:53:30,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:53:22" (1/3) ... [2021-11-07 00:53:30,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22b1830e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:30, skipping insertion in model container [2021-11-07 00:53:30,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:23" (2/3) ... [2021-11-07 00:53:30,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22b1830e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:30, skipping insertion in model container [2021-11-07 00:53:30,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:30" (3/3) ... [2021-11-07 00:53:30,817 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec4_product34.cil.c [2021-11-07 00:53:30,822 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:53:30,834 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-07 00:53:30,915 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:53:30,922 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 00:53:30,922 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-07 00:53:30,995 INFO L276 IsEmpty]: Start isEmpty. Operand has 1266 states, 1259 states have (on average 1.7267672756155679) internal successors, (2174), 1265 states have internal predecessors, (2174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:31,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 00:53:31,020 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:31,021 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:31,022 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:31,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:31,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1359700768, now seen corresponding path program 1 times [2021-11-07 00:53:31,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:31,044 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1700664279] [2021-11-07 00:53:31,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:31,045 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:31,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:31,048 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:31,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:53:31,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:31,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:53:31,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:31,732 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 00:53:31,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:31,936 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 00:53:31,937 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:31,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1700664279] [2021-11-07 00:53:31,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1700664279] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:31,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:31,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:53:31,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771573165] [2021-11-07 00:53:31,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:53:31,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:31,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:53:31,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:53:31,972 INFO L87 Difference]: Start difference. First operand has 1266 states, 1259 states have (on average 1.7267672756155679) internal successors, (2174), 1265 states have internal predecessors, (2174), 0 states have call successors, (0), 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 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:32,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:32,085 INFO L93 Difference]: Finished difference Result 2247 states and 3825 transitions. [2021-11-07 00:53:32,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:53:32,087 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 00:53:32,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:32,117 INFO L225 Difference]: With dead ends: 2247 [2021-11-07 00:53:32,117 INFO L226 Difference]: Without dead ends: 1052 [2021-11-07 00:53:32,124 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 98 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 00:53:32,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1052 states. [2021-11-07 00:53:32,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1052 to 1052. [2021-11-07 00:53:32,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1052 states, 1046 states have (on average 1.7294455066921606) internal successors, (1809), 1051 states have internal predecessors, (1809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:32,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1809 transitions. [2021-11-07 00:53:32,275 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1809 transitions. Word has length 50 [2021-11-07 00:53:32,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:32,276 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1809 transitions. [2021-11-07 00:53:32,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 25.0) internal successors, (50), 2 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:32,277 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1809 transitions. [2021-11-07 00:53:32,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 00:53:32,287 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:32,287 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 00:53:32,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:32,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:32,502 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:32,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:32,503 INFO L85 PathProgramCache]: Analyzing trace with hash -1007930856, now seen corresponding path program 1 times [2021-11-07 00:53:32,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:32,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1957669574] [2021-11-07 00:53:32,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:32,505 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:32,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:32,507 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:32,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:53:32,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:32,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:53:32,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:33,080 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 00:53:33,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:33,229 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 00:53:33,230 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:33,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1957669574] [2021-11-07 00:53:33,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1957669574] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:33,230 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:33,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:53:33,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771676218] [2021-11-07 00:53:33,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:33,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:33,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:33,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:33,238 INFO L87 Difference]: Start difference. First operand 1052 states and 1809 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:33,411 INFO L93 Difference]: Finished difference Result 3126 states and 5379 transitions. [2021-11-07 00:53:33,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:33,412 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 00:53:33,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:33,427 INFO L225 Difference]: With dead ends: 3126 [2021-11-07 00:53:33,427 INFO L226 Difference]: Without dead ends: 2089 [2021-11-07 00:53:33,430 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:33,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2089 states. [2021-11-07 00:53:33,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2089 to 1051. [2021-11-07 00:53:33,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1051 states, 1045 states have (on average 1.7263157894736842) internal successors, (1804), 1050 states have internal predecessors, (1804), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1051 states to 1051 states and 1804 transitions. [2021-11-07 00:53:33,530 INFO L78 Accepts]: Start accepts. Automaton has 1051 states and 1804 transitions. Word has length 51 [2021-11-07 00:53:33,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:33,531 INFO L470 AbstractCegarLoop]: Abstraction has 1051 states and 1804 transitions. [2021-11-07 00:53:33,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,531 INFO L276 IsEmpty]: Start isEmpty. Operand 1051 states and 1804 transitions. [2021-11-07 00:53:33,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 00:53:33,534 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:33,534 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 00:53:33,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:33,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:33,756 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:33,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:33,757 INFO L85 PathProgramCache]: Analyzing trace with hash -312765442, now seen corresponding path program 1 times [2021-11-07 00:53:33,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:33,758 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1522857755] [2021-11-07 00:53:33,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:33,759 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:33,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:33,760 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:33,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:53:34,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:34,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:53:34,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:34,371 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 00:53:34,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:34,530 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 00:53:34,530 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:34,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1522857755] [2021-11-07 00:53:34,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1522857755] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:34,531 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:34,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:53:34,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665063330] [2021-11-07 00:53:34,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:53:34,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:34,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:53:34,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:34,537 INFO L87 Difference]: Start difference. First operand 1051 states and 1804 transitions. Second operand has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:34,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:34,917 INFO L93 Difference]: Finished difference Result 4121 states and 7078 transitions. [2021-11-07 00:53:34,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:53:34,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-07 00:53:34,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:34,937 INFO L225 Difference]: With dead ends: 4121 [2021-11-07 00:53:34,937 INFO L226 Difference]: Without dead ends: 3088 [2021-11-07 00:53:34,940 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 100 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 00:53:34,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3088 states. [2021-11-07 00:53:35,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3088 to 1050. [2021-11-07 00:53:35,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1050 states, 1044 states have (on average 1.7241379310344827) internal successors, (1800), 1049 states have internal predecessors, (1800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:35,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1050 states to 1050 states and 1800 transitions. [2021-11-07 00:53:35,039 INFO L78 Accepts]: Start accepts. Automaton has 1050 states and 1800 transitions. Word has length 53 [2021-11-07 00:53:35,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:35,040 INFO L470 AbstractCegarLoop]: Abstraction has 1050 states and 1800 transitions. [2021-11-07 00:53:35,041 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.666666666666666) internal successors, (58), 6 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:35,041 INFO L276 IsEmpty]: Start isEmpty. Operand 1050 states and 1800 transitions. [2021-11-07 00:53:35,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 00:53:35,046 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:35,046 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:35,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:35,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:35,260 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:35,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:35,264 INFO L85 PathProgramCache]: Analyzing trace with hash -1683444015, now seen corresponding path program 1 times [2021-11-07 00:53:35,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:35,266 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1483765619] [2021-11-07 00:53:35,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:35,267 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:35,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:35,268 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:35,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:53:35,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:35,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:53:35,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:35,849 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 00:53:35,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:35,981 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 00:53:35,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:35,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1483765619] [2021-11-07 00:53:35,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1483765619] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:35,983 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:35,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:53:35,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368707909] [2021-11-07 00:53:35,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:35,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:35,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:35,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:35,986 INFO L87 Difference]: Start difference. First operand 1050 states and 1800 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:36,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:36,095 INFO L93 Difference]: Finished difference Result 2097 states and 3597 transitions. [2021-11-07 00:53:36,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:36,096 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-07 00:53:36,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:36,103 INFO L225 Difference]: With dead ends: 2097 [2021-11-07 00:53:36,103 INFO L226 Difference]: Without dead ends: 1055 [2021-11-07 00:53:36,105 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:36,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1055 states. [2021-11-07 00:53:36,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1055 to 1050. [2021-11-07 00:53:36,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1050 states, 1044 states have (on average 1.721264367816092) internal successors, (1797), 1049 states have internal predecessors, (1797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:36,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1050 states to 1050 states and 1797 transitions. [2021-11-07 00:53:36,188 INFO L78 Accepts]: Start accepts. Automaton has 1050 states and 1797 transitions. Word has length 54 [2021-11-07 00:53:36,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:36,189 INFO L470 AbstractCegarLoop]: Abstraction has 1050 states and 1797 transitions. [2021-11-07 00:53:36,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:36,189 INFO L276 IsEmpty]: Start isEmpty. Operand 1050 states and 1797 transitions. [2021-11-07 00:53:36,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 00:53:36,191 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:36,191 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 00:53:36,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:36,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:36,406 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:36,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:36,407 INFO L85 PathProgramCache]: Analyzing trace with hash 978187494, now seen corresponding path program 1 times [2021-11-07 00:53:36,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:36,408 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1305368978] [2021-11-07 00:53:36,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:36,409 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:36,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:36,410 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:36,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:53:36,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:36,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:53:36,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:37,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:37,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:37,245 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 00:53:37,249 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:37,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1305368978] [2021-11-07 00:53:37,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1305368978] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:37,250 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:37,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:53:37,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086936045] [2021-11-07 00:53:37,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:53:37,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:37,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:53:37,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:37,252 INFO L87 Difference]: Start difference. First operand 1050 states and 1797 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:37,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:37,668 INFO L93 Difference]: Finished difference Result 4108 states and 7054 transitions. [2021-11-07 00:53:37,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:53:37,668 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 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 00:53:37,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:37,688 INFO L225 Difference]: With dead ends: 4108 [2021-11-07 00:53:37,688 INFO L226 Difference]: Without dead ends: 3084 [2021-11-07 00:53:37,692 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 104 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 00:53:37,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3084 states. [2021-11-07 00:53:37,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3084 to 1050. [2021-11-07 00:53:37,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1050 states, 1044 states have (on average 1.7183908045977012) internal successors, (1794), 1049 states have internal predecessors, (1794), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:37,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1050 states to 1050 states and 1794 transitions. [2021-11-07 00:53:37,801 INFO L78 Accepts]: Start accepts. Automaton has 1050 states and 1794 transitions. Word has length 55 [2021-11-07 00:53:37,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:37,802 INFO L470 AbstractCegarLoop]: Abstraction has 1050 states and 1794 transitions. [2021-11-07 00:53:37,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 6 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:37,802 INFO L276 IsEmpty]: Start isEmpty. Operand 1050 states and 1794 transitions. [2021-11-07 00:53:37,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 00:53:37,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:37,804 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] [2021-11-07 00:53:37,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:38,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:38,019 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:38,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:38,020 INFO L85 PathProgramCache]: Analyzing trace with hash -300371167, now seen corresponding path program 1 times [2021-11-07 00:53:38,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:38,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1858715130] [2021-11-07 00:53:38,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:38,021 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:38,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:38,023 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:38,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:53:38,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:38,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:38,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:38,654 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 00:53:38,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:38,806 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 00:53:38,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:38,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1858715130] [2021-11-07 00:53:38,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1858715130] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:38,807 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:38,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:53:38,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924692371] [2021-11-07 00:53:38,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:38,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:38,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:38,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:38,811 INFO L87 Difference]: Start difference. First operand 1050 states and 1794 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:38,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:38,992 INFO L93 Difference]: Finished difference Result 2841 states and 4847 transitions. [2021-11-07 00:53:38,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:38,992 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 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 57 [2021-11-07 00:53:38,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:39,005 INFO L225 Difference]: With dead ends: 2841 [2021-11-07 00:53:39,006 INFO L226 Difference]: Without dead ends: 2074 [2021-11-07 00:53:39,008 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 110 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 00:53:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2074 states. [2021-11-07 00:53:39,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2074 to 1307. [2021-11-07 00:53:39,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1307 states, 1301 states have (on average 1.7425057647963105) internal successors, (2267), 1306 states have internal predecessors, (2267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:39,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1307 states to 1307 states and 2267 transitions. [2021-11-07 00:53:39,157 INFO L78 Accepts]: Start accepts. Automaton has 1307 states and 2267 transitions. Word has length 57 [2021-11-07 00:53:39,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:39,159 INFO L470 AbstractCegarLoop]: Abstraction has 1307 states and 2267 transitions. [2021-11-07 00:53:39,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:39,159 INFO L276 IsEmpty]: Start isEmpty. Operand 1307 states and 2267 transitions. [2021-11-07 00:53:39,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:53:39,161 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:39,162 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 00:53:39,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:39,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:39,377 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:39,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:39,377 INFO L85 PathProgramCache]: Analyzing trace with hash -2025615118, now seen corresponding path program 1 times [2021-11-07 00:53:39,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:39,378 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1304685548] [2021-11-07 00:53:39,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:39,378 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:39,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:39,379 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:39,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:53:39,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:39,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:39,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:40,025 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:40,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:40,194 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 00:53:40,194 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:40,194 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1304685548] [2021-11-07 00:53:40,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1304685548] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:40,194 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:40,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:40,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304680244] [2021-11-07 00:53:40,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:40,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:40,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:40,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:40,196 INFO L87 Difference]: Start difference. First operand 1307 states and 2267 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 00:53:40,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:40,357 INFO L93 Difference]: Finished difference Result 3502 states and 6067 transitions. [2021-11-07 00:53:40,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:40,358 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 00:53:40,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:40,372 INFO L225 Difference]: With dead ends: 3502 [2021-11-07 00:53:40,372 INFO L226 Difference]: Without dead ends: 2279 [2021-11-07 00:53:40,376 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 00:53:40,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2279 states. [2021-11-07 00:53:40,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2279 to 1512. [2021-11-07 00:53:40,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1506 states have (on average 1.754980079681275) internal successors, (2643), 1511 states have internal predecessors, (2643), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:40,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 2643 transitions. [2021-11-07 00:53:40,508 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 2643 transitions. Word has length 69 [2021-11-07 00:53:40,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:40,509 INFO L470 AbstractCegarLoop]: Abstraction has 1512 states and 2643 transitions. [2021-11-07 00:53:40,509 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 00:53:40,509 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 2643 transitions. [2021-11-07 00:53:40,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 00:53:40,512 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:40,512 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 00:53:40,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:40,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:40,727 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:40,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:40,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1771374993, now seen corresponding path program 1 times [2021-11-07 00:53:40,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:40,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1902887724] [2021-11-07 00:53:40,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:40,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:40,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:40,735 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:40,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:53:41,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:41,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:41,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:41,361 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 00:53:41,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:41,529 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 00:53:41,530 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:41,530 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1902887724] [2021-11-07 00:53:41,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1902887724] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:41,530 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:41,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:41,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188889568] [2021-11-07 00:53:41,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:41,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:41,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:41,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:41,532 INFO L87 Difference]: Start difference. First operand 1512 states and 2643 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 00:53:41,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:41,766 INFO L93 Difference]: Finished difference Result 4161 states and 7281 transitions. [2021-11-07 00:53:41,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:41,767 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 00:53:41,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:41,782 INFO L225 Difference]: With dead ends: 4161 [2021-11-07 00:53:41,783 INFO L226 Difference]: Without dead ends: 2737 [2021-11-07 00:53:41,786 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 00:53:41,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2737 states. [2021-11-07 00:53:41,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2737 to 1970. [2021-11-07 00:53:41,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1970 states, 1964 states have (on average 1.7744399185336048) internal successors, (3485), 1969 states have internal predecessors, (3485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:41,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1970 states to 1970 states and 3485 transitions. [2021-11-07 00:53:41,941 INFO L78 Accepts]: Start accepts. Automaton has 1970 states and 3485 transitions. Word has length 70 [2021-11-07 00:53:41,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:41,941 INFO L470 AbstractCegarLoop]: Abstraction has 1970 states and 3485 transitions. [2021-11-07 00:53:41,942 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 00:53:41,942 INFO L276 IsEmpty]: Start isEmpty. Operand 1970 states and 3485 transitions. [2021-11-07 00:53:41,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 00:53:41,945 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:41,945 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, 1, 1] [2021-11-07 00:53:41,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:42,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:42,160 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:42,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:42,161 INFO L85 PathProgramCache]: Analyzing trace with hash 921182337, now seen corresponding path program 1 times [2021-11-07 00:53:42,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:42,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1561618281] [2021-11-07 00:53:42,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:42,162 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:42,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:42,163 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:42,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:53:42,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:42,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:42,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:42,918 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 00:53:42,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:43,079 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 00:53:43,079 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:43,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1561618281] [2021-11-07 00:53:43,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1561618281] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:43,079 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:43,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:53:43,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759789422] [2021-11-07 00:53:43,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:43,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:43,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:43,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:43,081 INFO L87 Difference]: Start difference. First operand 1970 states and 3485 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:43,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:43,318 INFO L93 Difference]: Finished difference Result 4418 states and 7751 transitions. [2021-11-07 00:53:43,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:43,319 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 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 00:53:43,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:43,336 INFO L225 Difference]: With dead ends: 4418 [2021-11-07 00:53:43,337 INFO L226 Difference]: Without dead ends: 2737 [2021-11-07 00:53:43,340 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 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 00:53:43,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2737 states. [2021-11-07 00:53:43,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2737 to 1970. [2021-11-07 00:53:43,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1970 states, 1964 states have (on average 1.7734215885947047) internal successors, (3483), 1969 states have internal predecessors, (3483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:43,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1970 states to 1970 states and 3483 transitions. [2021-11-07 00:53:43,489 INFO L78 Accepts]: Start accepts. Automaton has 1970 states and 3483 transitions. Word has length 71 [2021-11-07 00:53:43,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:43,490 INFO L470 AbstractCegarLoop]: Abstraction has 1970 states and 3483 transitions. [2021-11-07 00:53:43,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:43,490 INFO L276 IsEmpty]: Start isEmpty. Operand 1970 states and 3483 transitions. [2021-11-07 00:53:43,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 00:53:43,499 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:43,499 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 00:53:43,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:43,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:43,715 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:43,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:43,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1991893664, now seen corresponding path program 1 times [2021-11-07 00:53:43,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:43,716 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1684364686] [2021-11-07 00:53:43,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:43,716 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:43,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:43,718 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:43,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:53:44,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:44,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:44,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:44,539 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 00:53:44,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:44,701 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 00:53:44,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:44,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1684364686] [2021-11-07 00:53:44,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1684364686] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:44,702 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:44,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:44,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302879343] [2021-11-07 00:53:44,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:44,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:44,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:44,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:44,705 INFO L87 Difference]: Start difference. First operand 1970 states and 3483 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 00:53:44,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:44,920 INFO L93 Difference]: Finished difference Result 5507 states and 9756 transitions. [2021-11-07 00:53:44,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:44,921 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 00:53:44,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:44,958 INFO L225 Difference]: With dead ends: 5507 [2021-11-07 00:53:44,959 INFO L226 Difference]: Without dead ends: 3633 [2021-11-07 00:53:44,962 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 00:53:44,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3633 states. [2021-11-07 00:53:45,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3633 to 2866. [2021-11-07 00:53:45,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2866 states, 2860 states have (on average 1.7937062937062938) internal successors, (5130), 2865 states have internal predecessors, (5130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:45,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2866 states to 2866 states and 5130 transitions. [2021-11-07 00:53:45,171 INFO L78 Accepts]: Start accepts. Automaton has 2866 states and 5130 transitions. Word has length 71 [2021-11-07 00:53:45,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:45,171 INFO L470 AbstractCegarLoop]: Abstraction has 2866 states and 5130 transitions. [2021-11-07 00:53:45,172 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 00:53:45,172 INFO L276 IsEmpty]: Start isEmpty. Operand 2866 states and 5130 transitions. [2021-11-07 00:53:45,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 00:53:45,176 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:45,177 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 00:53:45,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:45,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:45,392 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:45,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:45,392 INFO L85 PathProgramCache]: Analyzing trace with hash 476131027, now seen corresponding path program 1 times [2021-11-07 00:53:45,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:45,393 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1501190385] [2021-11-07 00:53:45,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:45,393 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:45,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:45,394 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:45,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:53:45,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:45,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:45,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:46,148 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 00:53:46,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:46,319 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 00:53:46,319 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:46,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1501190385] [2021-11-07 00:53:46,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1501190385] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:46,320 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:46,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:46,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818247573] [2021-11-07 00:53:46,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:46,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:46,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:46,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:46,322 INFO L87 Difference]: Start difference. First operand 2866 states and 5130 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 00:53:46,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:46,633 INFO L93 Difference]: Finished difference Result 7931 states and 14216 transitions. [2021-11-07 00:53:46,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:46,633 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 00:53:46,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:46,648 INFO L225 Difference]: With dead ends: 7931 [2021-11-07 00:53:46,648 INFO L226 Difference]: Without dead ends: 5195 [2021-11-07 00:53:46,653 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 00:53:46,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5195 states. [2021-11-07 00:53:46,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5195 to 4428. [2021-11-07 00:53:46,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4428 states, 4422 states have (on average 1.8089099954771597) internal successors, (7999), 4427 states have internal predecessors, (7999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4428 states to 4428 states and 7999 transitions. [2021-11-07 00:53:46,982 INFO L78 Accepts]: Start accepts. Automaton has 4428 states and 7999 transitions. Word has length 72 [2021-11-07 00:53:46,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:46,982 INFO L470 AbstractCegarLoop]: Abstraction has 4428 states and 7999 transitions. [2021-11-07 00:53:46,983 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 00:53:46,983 INFO L276 IsEmpty]: Start isEmpty. Operand 4428 states and 7999 transitions. [2021-11-07 00:53:46,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 00:53:46,990 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:46,990 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, 1] [2021-11-07 00:53:47,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:47,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:47,196 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:47,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:47,197 INFO L85 PathProgramCache]: Analyzing trace with hash 123118193, now seen corresponding path program 1 times [2021-11-07 00:53:47,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:47,197 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [22243477] [2021-11-07 00:53:47,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:47,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:47,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:47,199 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:47,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:53:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:47,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:47,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:47,956 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 00:53:47,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:48,144 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 00:53:48,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:48,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [22243477] [2021-11-07 00:53:48,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [22243477] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:48,145 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:48,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:48,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318585812] [2021-11-07 00:53:48,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:48,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:48,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:48,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:48,146 INFO L87 Difference]: Start difference. First operand 4428 states and 7999 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:48,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:48,547 INFO L93 Difference]: Finished difference Result 12333 states and 22306 transitions. [2021-11-07 00:53:48,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:48,547 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 00:53:48,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:48,569 INFO L225 Difference]: With dead ends: 12333 [2021-11-07 00:53:48,570 INFO L226 Difference]: Without dead ends: 8069 [2021-11-07 00:53:48,577 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 143 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 00:53:48,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8069 states. [2021-11-07 00:53:49,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8069 to 7302. [2021-11-07 00:53:49,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7302 states, 7296 states have (on average 1.819078947368421) internal successors, (13272), 7301 states have internal predecessors, (13272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:49,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7302 states to 7302 states and 13272 transitions. [2021-11-07 00:53:49,035 INFO L78 Accepts]: Start accepts. Automaton has 7302 states and 13272 transitions. Word has length 73 [2021-11-07 00:53:49,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:49,035 INFO L470 AbstractCegarLoop]: Abstraction has 7302 states and 13272 transitions. [2021-11-07 00:53:49,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:49,036 INFO L276 IsEmpty]: Start isEmpty. Operand 7302 states and 13272 transitions. [2021-11-07 00:53:49,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 00:53:49,044 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:49,045 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 00:53:49,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:49,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:49,260 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:49,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:49,261 INFO L85 PathProgramCache]: Analyzing trace with hash -790565163, now seen corresponding path program 1 times [2021-11-07 00:53:49,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:49,261 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [497125014] [2021-11-07 00:53:49,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:49,262 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:49,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:49,263 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:49,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:53:49,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:49,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:53:49,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:50,073 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 00:53:50,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:50,317 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 00:53:50,317 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:50,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [497125014] [2021-11-07 00:53:50,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [497125014] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:50,318 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:50,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:53:50,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143373781] [2021-11-07 00:53:50,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:53:50,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:50,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:53:50,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:50,319 INFO L87 Difference]: Start difference. First operand 7302 states and 13272 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:53,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:53,819 INFO L93 Difference]: Finished difference Result 27719 states and 50423 transitions. [2021-11-07 00:53:53,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:53:53,820 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 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 00:53:53,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:53,873 INFO L225 Difference]: With dead ends: 27719 [2021-11-07 00:53:53,874 INFO L226 Difference]: Without dead ends: 20704 [2021-11-07 00:53:53,887 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 142 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 00:53:53,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20704 states. [2021-11-07 00:53:54,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20704 to 7252. [2021-11-07 00:53:54,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7252 states, 7246 states have (on average 1.8040298095500966) internal successors, (13072), 7251 states have internal predecessors, (13072), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:54,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7252 states to 7252 states and 13072 transitions. [2021-11-07 00:53:54,482 INFO L78 Accepts]: Start accepts. Automaton has 7252 states and 13072 transitions. Word has length 74 [2021-11-07 00:53:54,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:54,482 INFO L470 AbstractCegarLoop]: Abstraction has 7252 states and 13072 transitions. [2021-11-07 00:53:54,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:54,483 INFO L276 IsEmpty]: Start isEmpty. Operand 7252 states and 13072 transitions. [2021-11-07 00:53:54,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 00:53:54,490 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:54,491 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, 1, 1] [2021-11-07 00:53:54,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:54,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:54,706 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:54,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:54,706 INFO L85 PathProgramCache]: Analyzing trace with hash -419199804, now seen corresponding path program 1 times [2021-11-07 00:53:54,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:54,707 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1424118800] [2021-11-07 00:53:54,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:54,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:54,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:54,709 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:54,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:53:55,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:55,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:55,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:55,532 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 00:53:55,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:55,702 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 00:53:55,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:55,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1424118800] [2021-11-07 00:53:55,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1424118800] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:55,702 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:55,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:53:55,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624307146] [2021-11-07 00:53:55,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:55,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:55,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:55,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:55,704 INFO L87 Difference]: Start difference. First operand 7252 states and 13072 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 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 00:53:56,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:56,194 INFO L93 Difference]: Finished difference Result 21134 states and 38148 transitions. [2021-11-07 00:53:56,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:56,201 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 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 74 [2021-11-07 00:53:56,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:56,238 INFO L225 Difference]: With dead ends: 21134 [2021-11-07 00:53:56,238 INFO L226 Difference]: Without dead ends: 14053 [2021-11-07 00:53:56,248 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 145 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 00:53:56,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14053 states. [2021-11-07 00:53:56,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14053 to 13286. [2021-11-07 00:53:57,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13286 states, 13280 states have (on average 1.8097138554216867) internal successors, (24033), 13285 states have internal predecessors, (24033), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:57,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13286 states to 13286 states and 24033 transitions. [2021-11-07 00:53:57,114 INFO L78 Accepts]: Start accepts. Automaton has 13286 states and 24033 transitions. Word has length 74 [2021-11-07 00:53:57,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:57,114 INFO L470 AbstractCegarLoop]: Abstraction has 13286 states and 24033 transitions. [2021-11-07 00:53:57,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 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 00:53:57,115 INFO L276 IsEmpty]: Start isEmpty. Operand 13286 states and 24033 transitions. [2021-11-07 00:53:57,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 00:53:57,125 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:57,126 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:57,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:57,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:53:57,348 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:53:57,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:57,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1003393808, now seen corresponding path program 1 times [2021-11-07 00:53:57,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:53:57,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1923615216] [2021-11-07 00:53:57,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:57,349 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:53:57,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:53:57,350 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:53:57,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:53:57,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:58,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:53:58,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:58,206 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 00:53:58,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:58,440 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 00:53:58,440 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:53:58,440 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1923615216] [2021-11-07 00:53:58,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1923615216] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:53:58,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [237041251] [2021-11-07 00:53:58,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:58,441 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:53:58,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:53:58,444 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:53:58,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:53:59,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:59,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:53:59,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:59,641 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 00:53:59,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:59,950 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 00:53:59,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [237041251] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:59,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:53:59,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 00:53:59,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137006754] [2021-11-07 00:53:59,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:53:59,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:53:59,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:53:59,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:53:59,954 INFO L87 Difference]: Start difference. First operand 13286 states and 24033 transitions. Second operand has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:08,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:08,655 INFO L93 Difference]: Finished difference Result 89294 states and 160565 transitions. [2021-11-07 00:54:08,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:54:08,655 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 00:54:08,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:08,889 INFO L225 Difference]: With dead ends: 89294 [2021-11-07 00:54:08,889 INFO L226 Difference]: Without dead ends: 88545 [2021-11-07 00:54:08,930 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 00:54:09,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88545 states. [2021-11-07 00:54:11,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88545 to 26287. [2021-11-07 00:54:11,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26287 states, 26281 states have (on average 1.8108899965754728) internal successors, (47592), 26286 states have internal predecessors, (47592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:11,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26287 states to 26287 states and 47592 transitions. [2021-11-07 00:54:11,562 INFO L78 Accepts]: Start accepts. Automaton has 26287 states and 47592 transitions. Word has length 75 [2021-11-07 00:54:11,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:11,563 INFO L470 AbstractCegarLoop]: Abstraction has 26287 states and 47592 transitions. [2021-11-07 00:54:11,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 11.0) internal successors, (110), 10 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:11,563 INFO L276 IsEmpty]: Start isEmpty. Operand 26287 states and 47592 transitions. [2021-11-07 00:54:11,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 00:54:11,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:11,585 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 00:54:11,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:11,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:12,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:12,003 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:54:12,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:12,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1993799776, now seen corresponding path program 1 times [2021-11-07 00:54:12,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:12,005 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [806688893] [2021-11-07 00:54:12,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:12,005 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:12,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:12,006 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:12,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:54:12,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:12,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:12,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:12,976 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 00:54:12,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:13,262 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 00:54:13,262 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:13,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [806688893] [2021-11-07 00:54:13,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [806688893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:54:13,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1400061955] [2021-11-07 00:54:13,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:13,263 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:13,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:54:13,268 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:54:13,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:54:14,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:14,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:54:14,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:14,505 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 00:54:14,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:14,699 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 00:54:14,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1400061955] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:14,700 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:54:14,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 00:54:14,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448434777] [2021-11-07 00:54:14,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:54:14,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:14,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:54:14,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:54:14,702 INFO L87 Difference]: Start difference. First operand 26287 states and 47592 transitions. Second operand has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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 00:54:18,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:18,473 INFO L93 Difference]: Finished difference Result 28515 states and 51313 transitions. [2021-11-07 00:54:18,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:54:18,474 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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 76 [2021-11-07 00:54:18,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:18,531 INFO L225 Difference]: With dead ends: 28515 [2021-11-07 00:54:18,531 INFO L226 Difference]: Without dead ends: 27274 [2021-11-07 00:54:18,541 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:54:18,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27274 states. [2021-11-07 00:54:20,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27274 to 26281. [2021-11-07 00:54:20,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26281 states, 26275 states have (on average 1.8108087535680304) internal successors, (47579), 26280 states have internal predecessors, (47579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:20,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26281 states to 26281 states and 47579 transitions. [2021-11-07 00:54:20,283 INFO L78 Accepts]: Start accepts. Automaton has 26281 states and 47579 transitions. Word has length 76 [2021-11-07 00:54:20,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:20,284 INFO L470 AbstractCegarLoop]: Abstraction has 26281 states and 47579 transitions. [2021-11-07 00:54:20,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 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 00:54:20,284 INFO L276 IsEmpty]: Start isEmpty. Operand 26281 states and 47579 transitions. [2021-11-07 00:54:20,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 00:54:20,307 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:20,307 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 00:54:20,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:20,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-07 00:54:20,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:20,731 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:54:20,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:20,731 INFO L85 PathProgramCache]: Analyzing trace with hash -1032589117, now seen corresponding path program 1 times [2021-11-07 00:54:20,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:20,732 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1941879121] [2021-11-07 00:54:20,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:20,732 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:20,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:20,733 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:20,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:54:21,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:21,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:54:21,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:21,730 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 00:54:21,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:21,895 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 00:54:21,895 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:21,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1941879121] [2021-11-07 00:54:21,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1941879121] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:21,895 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:21,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 00:54:21,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483652387] [2021-11-07 00:54:21,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:21,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:21,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:21,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:21,897 INFO L87 Difference]: Start difference. First operand 26281 states and 47579 transitions. Second operand has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 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 00:54:23,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:23,541 INFO L93 Difference]: Finished difference Result 51789 states and 93963 transitions. [2021-11-07 00:54:23,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:54:23,541 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 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 76 [2021-11-07 00:54:23,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:23,599 INFO L225 Difference]: With dead ends: 51789 [2021-11-07 00:54:23,599 INFO L226 Difference]: Without dead ends: 25798 [2021-11-07 00:54:23,636 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 148 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 00:54:23,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25798 states. [2021-11-07 00:54:24,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25798 to 13284. [2021-11-07 00:54:24,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13284 states, 13278 states have (on average 1.8093086308178943) internal successors, (24024), 13283 states have internal predecessors, (24024), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:24,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13284 states to 13284 states and 24024 transitions. [2021-11-07 00:54:24,699 INFO L78 Accepts]: Start accepts. Automaton has 13284 states and 24024 transitions. Word has length 76 [2021-11-07 00:54:24,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:24,699 INFO L470 AbstractCegarLoop]: Abstraction has 13284 states and 24024 transitions. [2021-11-07 00:54:24,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.5) internal successors, (70), 4 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 00:54:24,699 INFO L276 IsEmpty]: Start isEmpty. Operand 13284 states and 24024 transitions. [2021-11-07 00:54:24,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 00:54:24,707 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:24,707 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] [2021-11-07 00:54:24,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:24,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:24,920 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:54:24,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:24,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1002442514, now seen corresponding path program 1 times [2021-11-07 00:54:24,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:24,922 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [645988824] [2021-11-07 00:54:24,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:24,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:24,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:24,922 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:24,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 00:54:25,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:25,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:25,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:26,176 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 00:54:26,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:26,413 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 00:54:26,414 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:26,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [645988824] [2021-11-07 00:54:26,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [645988824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:54:26,414 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1633127686] [2021-11-07 00:54:26,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:26,414 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:26,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:54:26,416 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:54:26,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 00:54:27,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:27,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:54:27,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:28,335 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 00:54:28,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:28,822 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:54:28,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1633127686] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:28,823 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:54:28,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:54:28,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861074118] [2021-11-07 00:54:28,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:54:28,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:28,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:54:28,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:54:28,826 INFO L87 Difference]: Start difference. First operand 13284 states and 24024 transitions. Second operand has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:50,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:50,477 INFO L93 Difference]: Finished difference Result 35482 states and 62697 transitions. [2021-11-07 00:54:50,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-07 00:54:50,478 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 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 78 [2021-11-07 00:54:50,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:50,522 INFO L225 Difference]: With dead ends: 35482 [2021-11-07 00:54:50,522 INFO L226 Difference]: Without dead ends: 34781 [2021-11-07 00:54:50,530 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1073, Invalid=3483, Unknown=0, NotChecked=0, Total=4556 [2021-11-07 00:54:50,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34781 states. [2021-11-07 00:54:52,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34781 to 26919. [2021-11-07 00:54:52,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26919 states, 26913 states have (on average 1.8077509010515365) internal successors, (48652), 26918 states have internal predecessors, (48652), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:52,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26919 states to 26919 states and 48652 transitions. [2021-11-07 00:54:52,247 INFO L78 Accepts]: Start accepts. Automaton has 26919 states and 48652 transitions. Word has length 78 [2021-11-07 00:54:52,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:52,247 INFO L470 AbstractCegarLoop]: Abstraction has 26919 states and 48652 transitions. [2021-11-07 00:54:52,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.125) internal successors, (130), 15 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:52,248 INFO L276 IsEmpty]: Start isEmpty. Operand 26919 states and 48652 transitions. [2021-11-07 00:54:52,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 00:54:52,262 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:52,263 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 00:54:52,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:52,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:52,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:52,683 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:54:52,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:52,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1831264115, now seen corresponding path program 1 times [2021-11-07 00:54:52,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:52,684 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1003151307] [2021-11-07 00:54:52,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:52,684 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:52,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:52,685 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:52,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 00:54:53,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:53,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:53,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:53,794 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 00:54:53,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:54,002 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 00:54:54,002 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:54,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1003151307] [2021-11-07 00:54:54,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1003151307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:54:54,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1115877234] [2021-11-07 00:54:54,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:54,003 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:54,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:54:54,004 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:54:54,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 00:54:55,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:55,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:54:55,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:55,889 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 00:54:55,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:56,319 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 00:54:56,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1115877234] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:56,320 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:54:56,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:54:56,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071892242] [2021-11-07 00:54:56,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:54:56,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:56,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:54:56,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:54:56,323 INFO L87 Difference]: Start difference. First operand 26919 states and 48652 transitions. Second operand has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:19,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:19,288 INFO L93 Difference]: Finished difference Result 70739 states and 125158 transitions. [2021-11-07 00:55:19,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-07 00:55:19,289 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 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 00:55:19,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:19,405 INFO L225 Difference]: With dead ends: 70739 [2021-11-07 00:55:19,405 INFO L226 Difference]: Without dead ends: 69117 [2021-11-07 00:55:19,421 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1073, Invalid=3483, Unknown=0, NotChecked=0, Total=4556 [2021-11-07 00:55:19,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69117 states. [2021-11-07 00:55:22,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69117 to 54115. [2021-11-07 00:55:22,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54115 states, 54109 states have (on average 1.8070376462326045) internal successors, (97777), 54114 states have internal predecessors, (97777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:22,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54115 states to 54115 states and 97777 transitions. [2021-11-07 00:55:22,727 INFO L78 Accepts]: Start accepts. Automaton has 54115 states and 97777 transitions. Word has length 79 [2021-11-07 00:55:22,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:22,727 INFO L470 AbstractCegarLoop]: Abstraction has 54115 states and 97777 transitions. [2021-11-07 00:55:22,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.25) internal successors, (132), 15 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:22,728 INFO L276 IsEmpty]: Start isEmpty. Operand 54115 states and 97777 transitions. [2021-11-07 00:55:22,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 00:55:22,746 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:22,746 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 00:55:22,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:22,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-07 00:55:23,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:23,148 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 3 more)] === [2021-11-07 00:55:23,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:23,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1183839503, now seen corresponding path program 1 times [2021-11-07 00:55:23,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:23,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [488906353] [2021-11-07 00:55:23,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:23,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:23,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:23,150 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:23,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 00:55:24,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:24,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:24,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:24,262 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 00:55:24,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:24,452 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 00:55:24,453 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:24,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [488906353] [2021-11-07 00:55:24,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [488906353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:24,453 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1411039831] [2021-11-07 00:55:24,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:24,453 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:24,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:24,465 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:24,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cd0255ab-f1a6-4a12-90cf-bc54bbec7d3d/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 00:55:25,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:25,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 00:55:25,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:26,024 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 00:55:26,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:26,328 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 00:55:26,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1411039831] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:26,328 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:26,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 00:55:26,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233106044] [2021-11-07 00:55:26,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 00:55:26,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:26,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 00:55:26,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-07 00:55:26,330 INFO L87 Difference]: Start difference. First operand 54115 states and 97777 transitions. Second operand has 11 states, 11 states have (on average 12.636363636363637) internal successors, (139), 11 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)