./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec27_product13.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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product13.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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 102266cd9873aec631509424dd889c2e48b781667738cfaa50930481a41b1570 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:05:35,914 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:05:35,916 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:05:35,980 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:05:35,981 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:05:35,984 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:05:35,988 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:05:35,995 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:05:35,997 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:05:35,999 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:05:36,000 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:05:36,002 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:05:36,003 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:05:36,005 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:05:36,007 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:05:36,009 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:05:36,011 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:05:36,012 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:05:36,015 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:05:36,018 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:05:36,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:05:36,023 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:05:36,025 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:05:36,026 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:05:36,031 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:05:36,032 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:05:36,033 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:05:36,034 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:05:36,035 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:05:36,036 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:05:36,037 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:05:36,038 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:05:36,040 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:05:36,041 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:05:36,043 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:05:36,047 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:05:36,048 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:05:36,049 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:05:36,049 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:05:36,051 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:05:36,052 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:05:36,054 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:05:36,106 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:05:36,110 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:05:36,111 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:05:36,112 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:05:36,112 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:05:36,112 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:05:36,113 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:05:36,113 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:05:36,113 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:05:36,113 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:05:36,115 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:05:36,115 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:05:36,115 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:05:36,116 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:05:36,116 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:05:36,117 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:05:36,117 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:05:36,118 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:05:36,118 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:05:36,118 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:05:36,118 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:05:36,119 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:05:36,119 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:05:36,119 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:05:36,120 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:05:36,120 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:05:36,120 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:05:36,120 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:05:36,121 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:05:36,123 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:05:36,123 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:05:36,123 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:05:36,124 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:05:36,124 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:05:36,124 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:05:36,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:05:36,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:05:36,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:05:36,126 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:05:36,126 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 102266cd9873aec631509424dd889c2e48b781667738cfaa50930481a41b1570 [2021-11-07 01:05:36,488 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:05:36,544 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:05:36,547 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:05:36,549 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:05:36,550 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:05:36,551 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product13.cil.c [2021-11-07 01:05:36,635 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/33de1cdb4/f6555944c3e64aadbfed14b6d651c393/FLAGb08a8107b [2021-11-07 01:05:37,426 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:05:37,437 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c [2021-11-07 01:05:37,482 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/33de1cdb4/f6555944c3e64aadbfed14b6d651c393/FLAGb08a8107b [2021-11-07 01:05:37,563 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/33de1cdb4/f6555944c3e64aadbfed14b6d651c393 [2021-11-07 01:05:37,565 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:05:37,567 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:05:37,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:05:37,569 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:05:37,573 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:05:37,574 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:05:37" (1/1) ... [2021-11-07 01:05:37,575 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72072e71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:37, skipping insertion in model container [2021-11-07 01:05:37,576 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:05:37" (1/1) ... [2021-11-07 01:05:37,584 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:05:37,696 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:05:38,485 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c[61687,61700] [2021-11-07 01:05:38,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:05:38,505 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 01:05:38,506 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@26fac4c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:38, skipping insertion in model container [2021-11-07 01:05:38,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:05:38,507 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:05:38,510 INFO L168 Benchmark]: Toolchain (without parser) took 940.82 ms. Allocated memory was 88.1 MB in the beginning and 125.8 MB in the end (delta: 37.7 MB). Free memory was 49.0 MB in the beginning and 88.0 MB in the end (delta: -39.0 MB). Peak memory consumption was 8.5 MB. Max. memory is 16.1 GB. [2021-11-07 01:05:38,511 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 88.1 MB. Free memory was 67.6 MB in the beginning and 67.5 MB in the end (delta: 64.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:05:38,512 INFO L168 Benchmark]: CACSL2BoogieTranslator took 937.64 ms. Allocated memory was 88.1 MB in the beginning and 125.8 MB in the end (delta: 37.7 MB). Free memory was 48.8 MB in the beginning and 88.0 MB in the end (delta: -39.2 MB). Peak memory consumption was 8.5 MB. Max. memory is 16.1 GB. [2021-11-07 01:05:38,514 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 88.1 MB. Free memory was 67.6 MB in the beginning and 67.5 MB in the end (delta: 64.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 937.64 ms. Allocated memory was 88.1 MB in the beginning and 125.8 MB in the end (delta: 37.7 MB). Free memory was 48.8 MB in the beginning and 88.0 MB in the end (delta: -39.2 MB). Peak memory consumption was 8.5 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 95]: 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec27_product13.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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 102266cd9873aec631509424dd889c2e48b781667738cfaa50930481a41b1570 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:05:41,278 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:05:41,283 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:05:41,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:05:41,352 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:05:41,359 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:05:41,361 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:05:41,367 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:05:41,371 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:05:41,382 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:05:41,384 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:05:41,386 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:05:41,387 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:05:41,391 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:05:41,394 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:05:41,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:05:41,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:05:41,403 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:05:41,406 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:05:41,431 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:05:41,434 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:05:41,435 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:05:41,439 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:05:41,441 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:05:41,446 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:05:41,446 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:05:41,447 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:05:41,450 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:05:41,450 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:05:41,452 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:05:41,453 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:05:41,454 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:05:41,456 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:05:41,458 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:05:41,460 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:05:41,460 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:05:41,461 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:05:41,462 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:05:41,462 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:05:41,464 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:05:41,465 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:05:41,472 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 01:05:41,527 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:05:41,527 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:05:41,529 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:05:41,529 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:05:41,530 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:05:41,530 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:05:41,530 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:05:41,531 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:05:41,531 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:05:41,533 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:05:41,534 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:05:41,535 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:05:41,535 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:05:41,535 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:05:41,535 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:05:41,536 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:05:41,536 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:05:41,536 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:05:41,536 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:05:41,537 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:05:41,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:05:41,537 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:05:41,538 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:05:41,538 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:05:41,538 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:05:41,539 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:05:41,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:05:41,539 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:05:41,539 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:05:41,540 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:05:41,540 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:05:41,540 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:05:41,541 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:05:41,541 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:05:41,541 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:05:41,542 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 102266cd9873aec631509424dd889c2e48b781667738cfaa50930481a41b1570 [2021-11-07 01:05:42,033 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:05:42,080 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:05:42,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:05:42,087 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:05:42,088 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:05:42,091 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec27_product13.cil.c [2021-11-07 01:05:42,178 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/80a8ea1ec/a43a805a57a0475082c29ec92f7becaf/FLAG9e4c2fa9e [2021-11-07 01:05:42,979 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:05:42,980 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c [2021-11-07 01:05:43,013 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/80a8ea1ec/a43a805a57a0475082c29ec92f7becaf/FLAG9e4c2fa9e [2021-11-07 01:05:43,214 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/data/80a8ea1ec/a43a805a57a0475082c29ec92f7becaf [2021-11-07 01:05:43,217 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:05:43,219 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:05:43,221 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:05:43,221 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:05:43,226 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:05:43,227 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:05:43" (1/1) ... [2021-11-07 01:05:43,228 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d36f658 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:43, skipping insertion in model container [2021-11-07 01:05:43,229 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:05:43" (1/1) ... [2021-11-07 01:05:43,238 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:05:43,347 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:05:44,226 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c[61687,61700] [2021-11-07 01:05:44,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:05:44,258 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:05:44,287 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:05:44,457 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c[61687,61700] [2021-11-07 01:05:44,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:05:44,469 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:05:44,601 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_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/sv-benchmarks/c/product-lines/email_spec27_product13.cil.c[61687,61700] [2021-11-07 01:05:44,602 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:05:44,646 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:05:44,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44 WrapperNode [2021-11-07 01:05:44,647 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:05:44,649 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:05:44,649 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:05:44,649 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:05:44,658 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,699 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,796 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:05:44,797 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:05:44,797 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:05:44,797 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:05:44,807 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,819 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,821 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,861 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,902 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,932 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:05:44,933 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:05:44,933 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:05:44,933 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:05:44,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (1/1) ... [2021-11-07 01:05:44,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:05:44,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:05:44,998 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:05:45,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:05:45,057 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 01:05:45,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:05:45,058 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:05:45,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:05:45,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:05:49,764 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:05:49,764 INFO L299 CfgBuilder]: Removed 239 assume(true) statements. [2021-11-07 01:05:49,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:05:49 BoogieIcfgContainer [2021-11-07 01:05:49,768 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:05:49,771 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:05:49,771 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:05:49,775 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:05:49,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:05:43" (1/3) ... [2021-11-07 01:05:49,776 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25e2e9eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:05:49, skipping insertion in model container [2021-11-07 01:05:49,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:05:44" (2/3) ... [2021-11-07 01:05:49,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25e2e9eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:05:49, skipping insertion in model container [2021-11-07 01:05:49,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:05:49" (3/3) ... [2021-11-07 01:05:49,779 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec27_product13.cil.c [2021-11-07 01:05:49,786 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:05:49,786 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:05:49,850 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:05:49,858 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:05:49,858 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:05:49,888 INFO L276 IsEmpty]: Start isEmpty. Operand has 401 states, 398 states have (on average 1.7763819095477387) internal successors, (707), 400 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:49,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 01:05:49,904 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:49,905 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:49,906 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:49,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:49,914 INFO L85 PathProgramCache]: Analyzing trace with hash -194309687, now seen corresponding path program 1 times [2021-11-07 01:05:49,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:49,932 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [740736612] [2021-11-07 01:05:49,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:49,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:49,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:49,937 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:49,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:05:50,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:50,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 01:05:50,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:50,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:50,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:50,992 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:50,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [740736612] [2021-11-07 01:05:50,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [740736612] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:50,994 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:50,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 01:05:50,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135707736] [2021-11-07 01:05:51,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 01:05:51,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:51,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 01:05:51,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:05:51,032 INFO L87 Difference]: Start difference. First operand has 401 states, 398 states have (on average 1.7763819095477387) internal successors, (707), 400 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:51,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:51,129 INFO L93 Difference]: Finished difference Result 564 states and 980 transitions. [2021-11-07 01:05:51,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 01:05:51,131 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 01:05:51,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:51,159 INFO L225 Difference]: With dead ends: 564 [2021-11-07 01:05:51,162 INFO L226 Difference]: Without dead ends: 396 [2021-11-07 01:05:51,168 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 01:05:51,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2021-11-07 01:05:51,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 396. [2021-11-07 01:05:51,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 394 states have (on average 1.763959390862944) internal successors, (695), 395 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:51,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 695 transitions. [2021-11-07 01:05:51,306 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 695 transitions. Word has length 48 [2021-11-07 01:05:51,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:51,307 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 695 transitions. [2021-11-07 01:05:51,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 24.0) internal successors, (48), 2 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:51,307 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 695 transitions. [2021-11-07 01:05:51,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 01:05:51,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:51,313 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:51,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:05:51,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:51,531 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:51,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:51,531 INFO L85 PathProgramCache]: Analyzing trace with hash -312161387, now seen corresponding path program 1 times [2021-11-07 01:05:51,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:51,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2068651674] [2021-11-07 01:05:51,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:51,533 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:51,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:51,539 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:51,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:05:51,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:52,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:05:52,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:52,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:52,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:52,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:52,511 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:52,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2068651674] [2021-11-07 01:05:52,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2068651674] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:52,512 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:52,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:05:52,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657573552] [2021-11-07 01:05:52,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:05:52,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:52,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:05:52,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:52,517 INFO L87 Difference]: Start difference. First operand 396 states and 695 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:52,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:52,674 INFO L93 Difference]: Finished difference Result 1158 states and 2037 transitions. [2021-11-07 01:05:52,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:05:52,675 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 01:05:52,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:52,682 INFO L225 Difference]: With dead ends: 1158 [2021-11-07 01:05:52,683 INFO L226 Difference]: Without dead ends: 777 [2021-11-07 01:05:52,690 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:52,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 777 states. [2021-11-07 01:05:52,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 777 to 395. [2021-11-07 01:05:52,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 393 states have (on average 1.7557251908396947) internal successors, (690), 394 states have internal predecessors, (690), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:52,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 690 transitions. [2021-11-07 01:05:52,754 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 690 transitions. Word has length 49 [2021-11-07 01:05:52,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:52,755 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 690 transitions. [2021-11-07 01:05:52,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:52,756 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 690 transitions. [2021-11-07 01:05:52,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:05:52,770 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:52,770 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:52,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:05:52,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:52,971 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:52,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:52,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1324314363, now seen corresponding path program 1 times [2021-11-07 01:05:52,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:52,974 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [15142333] [2021-11-07 01:05:52,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:52,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:52,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:52,978 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:53,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:05:53,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:53,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:05:53,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:53,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:53,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:53,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:53,965 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:53,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [15142333] [2021-11-07 01:05:53,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [15142333] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:53,966 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:53,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:05:53,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247150713] [2021-11-07 01:05:53,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:05:53,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:53,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:05:53,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:05:53,975 INFO L87 Difference]: Start difference. First operand 395 states and 690 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:54,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:54,284 INFO L93 Difference]: Finished difference Result 1497 states and 2622 transitions. [2021-11-07 01:05:54,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:05:54,285 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:05:54,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:54,294 INFO L225 Difference]: With dead ends: 1497 [2021-11-07 01:05:54,294 INFO L226 Difference]: Without dead ends: 1120 [2021-11-07 01:05:54,296 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:05:54,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-11-07 01:05:54,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 394. [2021-11-07 01:05:54,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 392 states have (on average 1.75) internal successors, (686), 393 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:54,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 686 transitions. [2021-11-07 01:05:54,334 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 686 transitions. Word has length 51 [2021-11-07 01:05:54,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:54,335 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 686 transitions. [2021-11-07 01:05:54,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:54,335 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 686 transitions. [2021-11-07 01:05:54,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 01:05:54,337 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:54,338 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:54,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:05:54,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:54,555 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:54,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:54,556 INFO L85 PathProgramCache]: Analyzing trace with hash -379903346, now seen corresponding path program 1 times [2021-11-07 01:05:54,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:54,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [219574845] [2021-11-07 01:05:54,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:54,558 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:54,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:54,563 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:54,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:05:55,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:55,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:05:55,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:55,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:55,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:55,546 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:55,547 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [219574845] [2021-11-07 01:05:55,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [219574845] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:55,547 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:55,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:05:55,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186118062] [2021-11-07 01:05:55,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:05:55,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:55,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:05:55,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:55,550 INFO L87 Difference]: Start difference. First operand 394 states and 686 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:55,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:55,637 INFO L93 Difference]: Finished difference Result 785 states and 1369 transitions. [2021-11-07 01:05:55,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:05:55,638 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 01:05:55,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:55,643 INFO L225 Difference]: With dead ends: 785 [2021-11-07 01:05:55,643 INFO L226 Difference]: Without dead ends: 399 [2021-11-07 01:05:55,644 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:55,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-11-07 01:05:55,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 394. [2021-11-07 01:05:55,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 392 states have (on average 1.7423469387755102) internal successors, (683), 393 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:55,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 683 transitions. [2021-11-07 01:05:55,678 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 683 transitions. Word has length 52 [2021-11-07 01:05:55,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:55,681 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 683 transitions. [2021-11-07 01:05:55,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:55,682 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 683 transitions. [2021-11-07 01:05:55,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 01:05:55,685 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:55,685 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:55,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:05:55,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:55,900 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:55,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:55,901 INFO L85 PathProgramCache]: Analyzing trace with hash 525658595, now seen corresponding path program 1 times [2021-11-07 01:05:55,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:55,902 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1981477448] [2021-11-07 01:05:55,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:55,902 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:55,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:55,905 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:55,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 01:05:56,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:56,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:05:56,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:56,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:56,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:56,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:56,930 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:56,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1981477448] [2021-11-07 01:05:56,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1981477448] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:56,931 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:56,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:05:56,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581131177] [2021-11-07 01:05:56,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:05:56,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:56,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:05:56,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:05:56,933 INFO L87 Difference]: Start difference. First operand 394 states and 683 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:57,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:57,197 INFO L93 Difference]: Finished difference Result 1484 states and 2598 transitions. [2021-11-07 01:05:57,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:05:57,198 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-07 01:05:57,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:57,208 INFO L225 Difference]: With dead ends: 1484 [2021-11-07 01:05:57,208 INFO L226 Difference]: Without dead ends: 1116 [2021-11-07 01:05:57,209 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:05:57,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2021-11-07 01:05:57,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 394. [2021-11-07 01:05:57,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 392 states have (on average 1.7346938775510203) internal successors, (680), 393 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:57,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 680 transitions. [2021-11-07 01:05:57,263 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 680 transitions. Word has length 53 [2021-11-07 01:05:57,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:57,264 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 680 transitions. [2021-11-07 01:05:57,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 6 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:57,264 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 680 transitions. [2021-11-07 01:05:57,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 01:05:57,266 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:57,266 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:57,288 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-07 01:05:57,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:57,479 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:57,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:57,480 INFO L85 PathProgramCache]: Analyzing trace with hash 966785758, now seen corresponding path program 1 times [2021-11-07 01:05:57,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:57,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1846025544] [2021-11-07 01:05:57,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:57,482 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:57,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:57,486 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:57,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:05:58,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:58,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:05:58,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:58,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:58,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:58,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:58,438 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:58,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1846025544] [2021-11-07 01:05:58,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1846025544] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:58,439 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:58,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:05:58,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507798992] [2021-11-07 01:05:58,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:05:58,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:58,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:05:58,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:58,441 INFO L87 Difference]: Start difference. First operand 394 states and 680 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:58,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:58,539 INFO L93 Difference]: Finished difference Result 920 states and 1594 transitions. [2021-11-07 01:05:58,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:05:58,541 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 01:05:58,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:58,547 INFO L225 Difference]: With dead ends: 920 [2021-11-07 01:05:58,547 INFO L226 Difference]: Without dead ends: 762 [2021-11-07 01:05:58,548 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:05:58,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-11-07 01:05:58,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 604. [2021-11-07 01:05:58,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 604 states, 602 states have (on average 1.7674418604651163) internal successors, (1064), 603 states have internal predecessors, (1064), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:58,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 1064 transitions. [2021-11-07 01:05:58,611 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 1064 transitions. Word has length 55 [2021-11-07 01:05:58,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:05:58,611 INFO L470 AbstractCegarLoop]: Abstraction has 604 states and 1064 transitions. [2021-11-07 01:05:58,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:58,612 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 1064 transitions. [2021-11-07 01:05:58,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 01:05:58,614 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:05:58,614 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:05:58,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:05:58,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:05:58,827 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:05:58,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:05:58,828 INFO L85 PathProgramCache]: Analyzing trace with hash 407194191, now seen corresponding path program 1 times [2021-11-07 01:05:58,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:05:58,829 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1320070253] [2021-11-07 01:05:58,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:05:58,830 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:05:58,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:05:58,831 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:05:58,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 01:05:59,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:05:59,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:05:59,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:05:59,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:59,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:05:59,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:05:59,818 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:05:59,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1320070253] [2021-11-07 01:05:59,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1320070253] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:05:59,819 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:05:59,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:05:59,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730535832] [2021-11-07 01:05:59,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:05:59,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:05:59,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:05:59,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:05:59,832 INFO L87 Difference]: Start difference. First operand 604 states and 1064 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:05:59,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:05:59,929 INFO L93 Difference]: Finished difference Result 1440 states and 2547 transitions. [2021-11-07 01:05:59,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:05:59,929 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 01:05:59,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:05:59,937 INFO L225 Difference]: With dead ends: 1440 [2021-11-07 01:05:59,937 INFO L226 Difference]: Without dead ends: 920 [2021-11-07 01:05:59,939 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:05:59,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2021-11-07 01:06:00,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 762. [2021-11-07 01:06:00,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 762 states, 760 states have (on average 1.7776315789473685) internal successors, (1351), 761 states have internal predecessors, (1351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:00,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 762 states to 762 states and 1351 transitions. [2021-11-07 01:06:00,017 INFO L78 Accepts]: Start accepts. Automaton has 762 states and 1351 transitions. Word has length 67 [2021-11-07 01:06:00,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:00,018 INFO L470 AbstractCegarLoop]: Abstraction has 762 states and 1351 transitions. [2021-11-07 01:06:00,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:00,019 INFO L276 IsEmpty]: Start isEmpty. Operand 762 states and 1351 transitions. [2021-11-07 01:06:00,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:06:00,021 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:00,021 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:00,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:00,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:00,235 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:00,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:00,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1215668562, now seen corresponding path program 1 times [2021-11-07 01:06:00,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:00,237 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1487770089] [2021-11-07 01:06:00,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:00,237 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:00,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:00,239 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:00,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:06:00,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:00,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:00,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:01,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:01,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:01,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:01,302 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:01,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1487770089] [2021-11-07 01:06:01,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1487770089] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:01,302 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:01,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:06:01,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877140981] [2021-11-07 01:06:01,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:06:01,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:01,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:06:01,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:01,304 INFO L87 Difference]: Start difference. First operand 762 states and 1351 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:01,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:01,447 INFO L93 Difference]: Finished difference Result 1958 states and 3494 transitions. [2021-11-07 01:06:01,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:01,448 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:06:01,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:01,458 INFO L225 Difference]: With dead ends: 1958 [2021-11-07 01:06:01,459 INFO L226 Difference]: Without dead ends: 1284 [2021-11-07 01:06:01,462 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:01,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1284 states. [2021-11-07 01:06:01,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1284 to 1126. [2021-11-07 01:06:01,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1124 states have (on average 1.7927046263345197) internal successors, (2015), 1125 states have internal predecessors, (2015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:01,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 2015 transitions. [2021-11-07 01:06:01,607 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 2015 transitions. Word has length 68 [2021-11-07 01:06:01,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:01,607 INFO L470 AbstractCegarLoop]: Abstraction has 1126 states and 2015 transitions. [2021-11-07 01:06:01,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:01,608 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 2015 transitions. [2021-11-07 01:06:01,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:06:01,611 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:01,612 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:01,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:01,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:01,830 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:01,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:01,831 INFO L85 PathProgramCache]: Analyzing trace with hash -131383234, now seen corresponding path program 1 times [2021-11-07 01:06:01,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:01,833 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1710887070] [2021-11-07 01:06:01,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:01,833 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:01,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:01,834 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:01,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:06:02,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:02,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:02,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:02,715 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:02,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:02,923 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:02,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:02,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1710887070] [2021-11-07 01:06:02,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1710887070] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:02,924 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:02,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:06:02,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397075104] [2021-11-07 01:06:02,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:06:02,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:02,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:06:02,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:06:02,926 INFO L87 Difference]: Start difference. First operand 1126 states and 2015 transitions. Second operand has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:03,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:03,073 INFO L93 Difference]: Finished difference Result 2168 states and 3875 transitions. [2021-11-07 01:06:03,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:03,074 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:06:03,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:03,084 INFO L225 Difference]: With dead ends: 2168 [2021-11-07 01:06:03,084 INFO L226 Difference]: Without dead ends: 1284 [2021-11-07 01:06:03,086 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:06:03,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1284 states. [2021-11-07 01:06:03,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1284 to 1126. [2021-11-07 01:06:03,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1124 states have (on average 1.7909252669039146) internal successors, (2013), 1125 states have internal predecessors, (2013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:03,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 2013 transitions. [2021-11-07 01:06:03,239 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 2013 transitions. Word has length 69 [2021-11-07 01:06:03,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:03,239 INFO L470 AbstractCegarLoop]: Abstraction has 1126 states and 2013 transitions. [2021-11-07 01:06:03,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.0) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:03,240 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 2013 transitions. [2021-11-07 01:06:03,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:06:03,248 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:03,248 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:03,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:03,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:03,467 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:03,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:03,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1121988477, now seen corresponding path program 1 times [2021-11-07 01:06:03,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:03,468 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1940716784] [2021-11-07 01:06:03,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:03,469 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:03,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:03,472 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:03,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 01:06:04,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:04,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:04,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:04,319 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 01:06:04,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:04,511 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:04,511 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1940716784] [2021-11-07 01:06:04,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1940716784] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:04,512 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:04,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:06:04,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802197576] [2021-11-07 01:06:04,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:06:04,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:04,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:06:04,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:04,514 INFO L87 Difference]: Start difference. First operand 1126 states and 2013 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:04,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:04,725 INFO L93 Difference]: Finished difference Result 3022 states and 5435 transitions. [2021-11-07 01:06:04,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:04,726 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:06:04,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:04,742 INFO L225 Difference]: With dead ends: 3022 [2021-11-07 01:06:04,742 INFO L226 Difference]: Without dead ends: 1992 [2021-11-07 01:06:04,745 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:04,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1992 states. [2021-11-07 01:06:04,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1992 to 1834. [2021-11-07 01:06:04,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1834 states, 1832 states have (on average 1.8034934497816595) internal successors, (3304), 1833 states have internal predecessors, (3304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:04,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1834 states to 1834 states and 3304 transitions. [2021-11-07 01:06:04,938 INFO L78 Accepts]: Start accepts. Automaton has 1834 states and 3304 transitions. Word has length 69 [2021-11-07 01:06:04,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:04,938 INFO L470 AbstractCegarLoop]: Abstraction has 1834 states and 3304 transitions. [2021-11-07 01:06:04,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:04,941 INFO L276 IsEmpty]: Start isEmpty. Operand 1834 states and 3304 transitions. [2021-11-07 01:06:04,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 01:06:04,949 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:04,950 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:04,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:05,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:05,164 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:05,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:05,164 INFO L85 PathProgramCache]: Analyzing trace with hash 910355568, now seen corresponding path program 1 times [2021-11-07 01:06:05,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:05,165 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [44839752] [2021-11-07 01:06:05,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:05,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:05,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:05,166 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:05,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 01:06:05,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:05,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:05,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:06,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:06,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:06,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:06,212 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:06,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [44839752] [2021-11-07 01:06:06,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [44839752] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:06,212 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:06,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:06:06,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352139036] [2021-11-07 01:06:06,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:06:06,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:06,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:06:06,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:06,217 INFO L87 Difference]: Start difference. First operand 1834 states and 3304 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:06,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:06,483 INFO L93 Difference]: Finished difference Result 4882 states and 8827 transitions. [2021-11-07 01:06:06,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:06,484 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 01:06:06,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:06,511 INFO L225 Difference]: With dead ends: 4882 [2021-11-07 01:06:06,511 INFO L226 Difference]: Without dead ends: 3178 [2021-11-07 01:06:06,517 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:06,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3178 states. [2021-11-07 01:06:06,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3178 to 3020. [2021-11-07 01:06:06,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3020 states, 3018 states have (on average 1.809476474486415) internal successors, (5461), 3019 states have internal predecessors, (5461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:06,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3020 states to 3020 states and 5461 transitions. [2021-11-07 01:06:06,866 INFO L78 Accepts]: Start accepts. Automaton has 3020 states and 5461 transitions. Word has length 70 [2021-11-07 01:06:06,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:06,868 INFO L470 AbstractCegarLoop]: Abstraction has 3020 states and 5461 transitions. [2021-11-07 01:06:06,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:06,868 INFO L276 IsEmpty]: Start isEmpty. Operand 3020 states and 5461 transitions. [2021-11-07 01:06:06,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 01:06:06,875 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:06,876 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:06,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:07,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:07,094 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:07,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:07,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1352445838, now seen corresponding path program 1 times [2021-11-07 01:06:07,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:07,096 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1358275675] [2021-11-07 01:06:07,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:07,096 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:07,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:07,098 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:07,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:06:07,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:07,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:07,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:08,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:08,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:08,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:08,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:08,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1358275675] [2021-11-07 01:06:08,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1358275675] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:08,213 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:08,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:06:08,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663407417] [2021-11-07 01:06:08,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:06:08,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:08,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:06:08,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:08,215 INFO L87 Difference]: Start difference. First operand 3020 states and 5461 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:08,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:08,657 INFO L93 Difference]: Finished difference Result 8156 states and 14781 transitions. [2021-11-07 01:06:08,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:08,657 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 01:06:08,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:08,699 INFO L225 Difference]: With dead ends: 8156 [2021-11-07 01:06:08,700 INFO L226 Difference]: Without dead ends: 5300 [2021-11-07 01:06:08,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:08,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5300 states. [2021-11-07 01:06:09,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5300 to 5142. [2021-11-07 01:06:09,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5142 states, 5140 states have (on average 1.811284046692607) internal successors, (9310), 5141 states have internal predecessors, (9310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:09,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5142 states to 5142 states and 9310 transitions. [2021-11-07 01:06:09,226 INFO L78 Accepts]: Start accepts. Automaton has 5142 states and 9310 transitions. Word has length 71 [2021-11-07 01:06:09,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:09,227 INFO L470 AbstractCegarLoop]: Abstraction has 5142 states and 9310 transitions. [2021-11-07 01:06:09,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:09,227 INFO L276 IsEmpty]: Start isEmpty. Operand 5142 states and 9310 transitions. [2021-11-07 01:06:09,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:06:09,239 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:09,239 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:09,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:09,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:09,460 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:09,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:09,460 INFO L85 PathProgramCache]: Analyzing trace with hash -1058303086, now seen corresponding path program 1 times [2021-11-07 01:06:09,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:09,461 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1828023563] [2021-11-07 01:06:09,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:09,462 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:09,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:09,464 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:09,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 01:06:10,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:10,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:10,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:10,454 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:06:10,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:10,748 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:06:10,748 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:10,748 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1828023563] [2021-11-07 01:06:10,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1828023563] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:10,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:10,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:06:10,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954927850] [2021-11-07 01:06:10,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:06:10,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:10,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:06:10,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:06:10,751 INFO L87 Difference]: Start difference. First operand 5142 states and 9310 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:14,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:14,169 INFO L93 Difference]: Finished difference Result 19220 states and 34842 transitions. [2021-11-07 01:06:14,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:06:14,170 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:06:14,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:14,265 INFO L225 Difference]: With dead ends: 19220 [2021-11-07 01:06:14,266 INFO L226 Difference]: Without dead ends: 14318 [2021-11-07 01:06:14,276 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:06:14,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14318 states. [2021-11-07 01:06:14,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14318 to 5092. [2021-11-07 01:06:15,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5092 states, 5090 states have (on average 1.7897838899803535) internal successors, (9110), 5091 states have internal predecessors, (9110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:15,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5092 states to 5092 states and 9110 transitions. [2021-11-07 01:06:15,031 INFO L78 Accepts]: Start accepts. Automaton has 5092 states and 9110 transitions. Word has length 72 [2021-11-07 01:06:15,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:15,031 INFO L470 AbstractCegarLoop]: Abstraction has 5092 states and 9110 transitions. [2021-11-07 01:06:15,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:15,033 INFO L276 IsEmpty]: Start isEmpty. Operand 5092 states and 9110 transitions. [2021-11-07 01:06:15,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:06:15,040 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:15,041 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:15,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:15,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:15,255 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:15,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:15,256 INFO L85 PathProgramCache]: Analyzing trace with hash -659289439, now seen corresponding path program 1 times [2021-11-07 01:06:15,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:15,257 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1160921984] [2021-11-07 01:06:15,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:15,258 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:15,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:15,260 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:15,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:06:16,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:16,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:06:16,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:16,371 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 01:06:16,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:16,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:16,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:16,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1160921984] [2021-11-07 01:06:16,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1160921984] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:16,578 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:16,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:06:16,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937589981] [2021-11-07 01:06:16,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:06:16,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:16,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:06:16,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:16,581 INFO L87 Difference]: Start difference. First operand 5092 states and 9110 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:17,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:17,143 INFO L93 Difference]: Finished difference Result 14833 states and 26582 transitions. [2021-11-07 01:06:17,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:06:17,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:06:17,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:17,183 INFO L225 Difference]: With dead ends: 14833 [2021-11-07 01:06:17,183 INFO L226 Difference]: Without dead ends: 9908 [2021-11-07 01:06:17,193 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:06:17,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9908 states. [2021-11-07 01:06:18,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9908 to 9750. [2021-11-07 01:06:18,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9750 states, 9748 states have (on average 1.789803036520312) internal successors, (17447), 9749 states have internal predecessors, (17447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:18,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9750 states to 9750 states and 17447 transitions. [2021-11-07 01:06:18,096 INFO L78 Accepts]: Start accepts. Automaton has 9750 states and 17447 transitions. Word has length 72 [2021-11-07 01:06:18,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:18,096 INFO L470 AbstractCegarLoop]: Abstraction has 9750 states and 17447 transitions. [2021-11-07 01:06:18,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:18,097 INFO L276 IsEmpty]: Start isEmpty. Operand 9750 states and 17447 transitions. [2021-11-07 01:06:18,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 01:06:18,108 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:18,109 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:18,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:18,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:18,331 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:18,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:18,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1445262707, now seen corresponding path program 1 times [2021-11-07 01:06:18,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:18,333 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2094656182] [2021-11-07 01:06:18,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:18,333 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:18,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:18,355 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:18,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 01:06:19,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:19,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:19,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:19,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:19,786 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:19,787 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:19,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2094656182] [2021-11-07 01:06:19,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2094656182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:06:19,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1479401986] [2021-11-07 01:06:19,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:19,788 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:19,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:06:19,790 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:06:19,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 01:06:20,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:20,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:06:20,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:21,176 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:21,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:21,565 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:21,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1479401986] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:21,566 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:06:21,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:06:21,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156689160] [2021-11-07 01:06:21,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:06:21,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:21,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:06:21,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:06:21,568 INFO L87 Difference]: Start difference. First operand 9750 states and 17447 transitions. Second operand has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:27,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:27,863 INFO L93 Difference]: Finished difference Result 57363 states and 103290 transitions. [2021-11-07 01:06:27,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 01:06:27,864 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 01:06:27,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:28,095 INFO L225 Difference]: With dead ends: 57363 [2021-11-07 01:06:28,095 INFO L226 Difference]: Without dead ends: 57223 [2021-11-07 01:06:28,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-11-07 01:06:28,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57223 states. [2021-11-07 01:06:30,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57223 to 19419. [2021-11-07 01:06:30,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19419 states, 19417 states have (on average 1.7901838595045578) internal successors, (34760), 19418 states have internal predecessors, (34760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:30,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19419 states to 19419 states and 34760 transitions. [2021-11-07 01:06:30,435 INFO L78 Accepts]: Start accepts. Automaton has 19419 states and 34760 transitions. Word has length 73 [2021-11-07 01:06:30,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:30,435 INFO L470 AbstractCegarLoop]: Abstraction has 19419 states and 34760 transitions. [2021-11-07 01:06:30,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:30,436 INFO L276 IsEmpty]: Start isEmpty. Operand 19419 states and 34760 transitions. [2021-11-07 01:06:30,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:06:30,456 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:30,456 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:30,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:30,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:31,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:31,024 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:31,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:31,024 INFO L85 PathProgramCache]: Analyzing trace with hash 37432457, now seen corresponding path program 1 times [2021-11-07 01:06:31,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:31,025 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1004347502] [2021-11-07 01:06:31,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:31,026 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:31,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:31,027 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:31,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:06:31,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:31,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:31,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:32,130 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:32,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:32,401 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:32,401 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:32,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1004347502] [2021-11-07 01:06:32,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1004347502] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:06:32,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1046268781] [2021-11-07 01:06:32,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:32,403 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:32,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:06:32,410 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:06:32,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:06:33,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:33,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:06:33,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:33,819 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:33,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:34,082 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:34,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1046268781] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:34,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:06:34,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 01:06:34,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613933219] [2021-11-07 01:06:34,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:06:34,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:34,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:06:34,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:06:34,085 INFO L87 Difference]: Start difference. First operand 19419 states and 34760 transitions. Second operand has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:37,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:37,371 INFO L93 Difference]: Finished difference Result 19709 states and 35246 transitions. [2021-11-07 01:06:37,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:06:37,373 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:06:37,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:37,433 INFO L225 Difference]: With dead ends: 19709 [2021-11-07 01:06:37,433 INFO L226 Difference]: Without dead ends: 19482 [2021-11-07 01:06:37,439 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:06:37,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19482 states. [2021-11-07 01:06:38,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19482 to 19413. [2021-11-07 01:06:39,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19413 states, 19411 states have (on average 1.7900674875070837) internal successors, (34747), 19412 states have internal predecessors, (34747), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:39,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19413 states to 19413 states and 34747 transitions. [2021-11-07 01:06:39,057 INFO L78 Accepts]: Start accepts. Automaton has 19413 states and 34747 transitions. Word has length 74 [2021-11-07 01:06:39,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:39,058 INFO L470 AbstractCegarLoop]: Abstraction has 19413 states and 34747 transitions. [2021-11-07 01:06:39,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:39,058 INFO L276 IsEmpty]: Start isEmpty. Operand 19413 states and 34747 transitions. [2021-11-07 01:06:39,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:06:39,078 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:39,079 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:39,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:39,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:39,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:39,496 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:39,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:39,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1100101888, now seen corresponding path program 1 times [2021-11-07 01:06:39,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:39,497 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [695415619] [2021-11-07 01:06:39,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:39,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:39,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:39,500 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:39,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:06:40,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:40,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:06:40,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:40,645 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:40,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:40,875 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:40,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:40,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [695415619] [2021-11-07 01:06:40,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [695415619] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:40,875 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:06:40,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 01:06:40,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653660814] [2021-11-07 01:06:40,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:06:40,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:40,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:06:40,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:06:40,877 INFO L87 Difference]: Start difference. First operand 19413 states and 34747 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:42,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:42,185 INFO L93 Difference]: Finished difference Result 37943 states and 68137 transitions. [2021-11-07 01:06:42,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:06:42,186 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:06:42,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:42,232 INFO L225 Difference]: With dead ends: 37943 [2021-11-07 01:06:42,232 INFO L226 Difference]: Without dead ends: 18773 [2021-11-07 01:06:42,262 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:06:42,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18773 states. [2021-11-07 01:06:43,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18773 to 9748. [2021-11-07 01:06:43,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9748 states, 9746 states have (on average 1.789246870510979) internal successors, (17438), 9747 states have internal predecessors, (17438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:43,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9748 states to 9748 states and 17438 transitions. [2021-11-07 01:06:43,293 INFO L78 Accepts]: Start accepts. Automaton has 9748 states and 17438 transitions. Word has length 74 [2021-11-07 01:06:43,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:43,294 INFO L470 AbstractCegarLoop]: Abstraction has 9748 states and 17438 transitions. [2021-11-07 01:06:43,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:43,294 INFO L276 IsEmpty]: Start isEmpty. Operand 9748 states and 17438 transitions. [2021-11-07 01:06:43,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 01:06:43,306 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:43,306 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:43,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:43,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:43,519 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:43,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:43,520 INFO L85 PathProgramCache]: Analyzing trace with hash 635737047, now seen corresponding path program 1 times [2021-11-07 01:06:43,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:43,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [845297874] [2021-11-07 01:06:43,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:43,522 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:43,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:43,523 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:43,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 01:06:44,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:44,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:44,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:44,733 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:44,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:44,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:44,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:44,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [845297874] [2021-11-07 01:06:44,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [845297874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:06:44,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1090257825] [2021-11-07 01:06:44,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:44,994 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:44,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:06:44,995 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:06:44,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 01:06:46,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:46,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 513 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:06:46,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:46,533 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:46,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:46,723 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:46,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1090257825] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:46,723 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:06:46,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 13 [2021-11-07 01:06:46,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212701571] [2021-11-07 01:06:46,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:06:46,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:46,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:06:46,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:06:46,726 INFO L87 Difference]: Start difference. First operand 9748 states and 17438 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:47,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:47,631 INFO L93 Difference]: Finished difference Result 9849 states and 17603 transitions. [2021-11-07 01:06:47,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:06:47,631 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 01:06:47,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:47,648 INFO L225 Difference]: With dead ends: 9849 [2021-11-07 01:06:47,648 INFO L226 Difference]: Without dead ends: 9748 [2021-11-07 01:06:47,652 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:06:47,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9748 states. [2021-11-07 01:06:48,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9748 to 9748. [2021-11-07 01:06:48,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9748 states, 9746 states have (on average 1.7890416581161501) internal successors, (17436), 9747 states have internal predecessors, (17436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:48,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9748 states to 9748 states and 17436 transitions. [2021-11-07 01:06:48,388 INFO L78 Accepts]: Start accepts. Automaton has 9748 states and 17436 transitions. Word has length 76 [2021-11-07 01:06:48,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:48,388 INFO L470 AbstractCegarLoop]: Abstraction has 9748 states and 17436 transitions. [2021-11-07 01:06:48,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:48,388 INFO L276 IsEmpty]: Start isEmpty. Operand 9748 states and 17436 transitions. [2021-11-07 01:06:48,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-07 01:06:48,399 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:48,399 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:48,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:48,620 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-07 01:06:48,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:48,816 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:48,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:48,816 INFO L85 PathProgramCache]: Analyzing trace with hash -21462455, now seen corresponding path program 1 times [2021-11-07 01:06:48,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:48,817 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [136196364] [2021-11-07 01:06:48,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:48,817 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:48,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:48,818 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:48,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 01:06:49,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:49,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:49,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:50,064 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:50,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:50,309 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:50,309 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:50,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [136196364] [2021-11-07 01:06:50,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [136196364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:06:50,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1992520934] [2021-11-07 01:06:50,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:50,310 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:50,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:06:50,311 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:06:50,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 01:06:51,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:51,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:06:51,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:52,020 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:52,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:52,269 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:52,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1992520934] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:06:52,269 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:06:52,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:06:52,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759786264] [2021-11-07 01:06:52,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:06:52,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:06:52,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:06:52,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:06:52,272 INFO L87 Difference]: Start difference. First operand 9748 states and 17436 transitions. Second operand has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:55,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:06:55,352 INFO L93 Difference]: Finished difference Result 10261 states and 18269 transitions. [2021-11-07 01:06:55,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:06:55,353 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-07 01:06:55,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:06:55,366 INFO L225 Difference]: With dead ends: 10261 [2021-11-07 01:06:55,366 INFO L226 Difference]: Without dead ends: 10160 [2021-11-07 01:06:55,369 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-11-07 01:06:55,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10160 states. [2021-11-07 01:06:56,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10160 to 9847. [2021-11-07 01:06:56,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9847 states, 9845 states have (on average 1.7874047739969527) internal successors, (17597), 9846 states have internal predecessors, (17597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:56,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9847 states to 9847 states and 17597 transitions. [2021-11-07 01:06:56,129 INFO L78 Accepts]: Start accepts. Automaton has 9847 states and 17597 transitions. Word has length 79 [2021-11-07 01:06:56,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:06:56,130 INFO L470 AbstractCegarLoop]: Abstraction has 9847 states and 17597 transitions. [2021-11-07 01:06:56,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 8.272727272727273) internal successors, (91), 11 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:06:56,130 INFO L276 IsEmpty]: Start isEmpty. Operand 9847 states and 17597 transitions. [2021-11-07 01:06:56,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:06:56,140 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:06:56,141 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:06:56,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:56,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:06:56,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:06:56,547 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:06:56,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:06:56,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1010484349, now seen corresponding path program 1 times [2021-11-07 01:06:56,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:06:56,548 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1061931302] [2021-11-07 01:06:56,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:56,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:06:56,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:06:56,550 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:06:56,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 01:06:57,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:57,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:06:57,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:57,878 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:57,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:06:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:06:58,145 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:06:58,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1061931302] [2021-11-07 01:06:58,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1061931302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:06:58,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [552456436] [2021-11-07 01:06:58,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:06:58,146 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:06:58,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:06:58,152 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:06:58,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 01:06:59,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:06:59,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:06:59,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:06:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:06:59,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:00,183 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:00,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [552456436] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:00,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:00,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:07:00,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722110476] [2021-11-07 01:07:00,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:07:00,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:00,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:07:00,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:07:00,186 INFO L87 Difference]: Start difference. First operand 9847 states and 17597 transitions. Second operand has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:01,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:07:01,149 INFO L93 Difference]: Finished difference Result 10098 states and 18013 transitions. [2021-11-07 01:07:01,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:07:01,150 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-07 01:07:01,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:07:01,164 INFO L225 Difference]: With dead ends: 10098 [2021-11-07 01:07:01,165 INFO L226 Difference]: Without dead ends: 9890 [2021-11-07 01:07:01,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=471, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:07:01,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9890 states. [2021-11-07 01:07:01,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9890 to 9843. [2021-11-07 01:07:01,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9843 states, 9841 states have (on average 1.7872167462656234) internal successors, (17588), 9842 states have internal predecessors, (17588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:01,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9843 states to 9843 states and 17588 transitions. [2021-11-07 01:07:01,886 INFO L78 Accepts]: Start accepts. Automaton has 9843 states and 17588 transitions. Word has length 80 [2021-11-07 01:07:01,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:07:01,886 INFO L470 AbstractCegarLoop]: Abstraction has 9843 states and 17588 transitions. [2021-11-07 01:07:01,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.222222222222221) internal successors, (74), 9 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:01,887 INFO L276 IsEmpty]: Start isEmpty. Operand 9843 states and 17588 transitions. [2021-11-07 01:07:01,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 01:07:01,897 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:07:01,897 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:07:01,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:02,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:02,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:07:02,303 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:07:02,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:07:02,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1648557877, now seen corresponding path program 1 times [2021-11-07 01:07:02,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:07:02,304 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [95922455] [2021-11-07 01:07:02,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:02,305 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:07:02,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:07:02,306 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:07:02,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 01:07:03,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:03,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:07:03,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:03,711 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:03,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:04,002 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 01:07:04,002 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:07:04,002 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [95922455] [2021-11-07 01:07:04,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [95922455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:07:04,003 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [527771358] [2021-11-07 01:07:04,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:04,003 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:04,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:07:04,010 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:07:04,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 01:07:05,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:05,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:07:05,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:05,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:05,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:06,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:06,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [527771358] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:06,180 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:06,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:07:06,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498987699] [2021-11-07 01:07:06,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:07:06,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:06,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:07:06,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:07:06,182 INFO L87 Difference]: Start difference. First operand 9843 states and 17588 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:06,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:07:06,797 INFO L93 Difference]: Finished difference Result 9979 states and 17809 transitions. [2021-11-07 01:07:06,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:07:06,798 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-07 01:07:06,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:07:06,812 INFO L225 Difference]: With dead ends: 9979 [2021-11-07 01:07:06,812 INFO L226 Difference]: Without dead ends: 9815 [2021-11-07 01:07:06,816 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:07:06,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9815 states. [2021-11-07 01:07:07,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9815 to 9748. [2021-11-07 01:07:07,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9748 states, 9746 states have (on average 1.7885286271290786) internal successors, (17431), 9747 states have internal predecessors, (17431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:07,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9748 states to 9748 states and 17431 transitions. [2021-11-07 01:07:07,496 INFO L78 Accepts]: Start accepts. Automaton has 9748 states and 17431 transitions. Word has length 80 [2021-11-07 01:07:07,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:07:07,497 INFO L470 AbstractCegarLoop]: Abstraction has 9748 states and 17431 transitions. [2021-11-07 01:07:07,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 6 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:07,497 INFO L276 IsEmpty]: Start isEmpty. Operand 9748 states and 17431 transitions. [2021-11-07 01:07:07,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 01:07:07,506 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:07:07,506 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:07:07,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:07,724 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-07 01:07:07,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:07,920 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:07:07,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:07:07,920 INFO L85 PathProgramCache]: Analyzing trace with hash -1358635424, now seen corresponding path program 1 times [2021-11-07 01:07:07,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:07:07,921 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [451452261] [2021-11-07 01:07:07,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:07,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:07:07,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:07:07,923 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:07:07,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 01:07:09,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:09,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:07:09,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:09,483 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:09,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:09,816 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:09,817 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:07:09,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [451452261] [2021-11-07 01:07:09,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [451452261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:07:09,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [671701743] [2021-11-07 01:07:09,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:09,817 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:09,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:07:09,819 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:07:09,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 01:07:11,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:11,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:07:11,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:12,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:12,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:13,080 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:13,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [671701743] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:13,081 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:13,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:07:13,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836191845] [2021-11-07 01:07:13,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:07:13,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:13,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:07:13,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:07:13,083 INFO L87 Difference]: Start difference. First operand 9748 states and 17431 transitions. Second operand has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:31,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:07:31,134 INFO L93 Difference]: Finished difference Result 30227 states and 53821 transitions. [2021-11-07 01:07:31,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-07 01:07:31,137 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-07 01:07:31,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:07:31,185 INFO L225 Difference]: With dead ends: 30227 [2021-11-07 01:07:31,185 INFO L226 Difference]: Without dead ends: 30113 [2021-11-07 01:07:31,196 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 471 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=586, Invalid=2066, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 01:07:31,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30113 states. [2021-11-07 01:07:32,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30113 to 19561. [2021-11-07 01:07:32,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19561 states, 19559 states have (on average 1.7878725906232424) internal successors, (34969), 19560 states have internal predecessors, (34969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:32,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19561 states to 19561 states and 34969 transitions. [2021-11-07 01:07:32,857 INFO L78 Accepts]: Start accepts. Automaton has 19561 states and 34969 transitions. Word has length 86 [2021-11-07 01:07:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:07:32,858 INFO L470 AbstractCegarLoop]: Abstraction has 19561 states and 34969 transitions. [2021-11-07 01:07:32,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.166666666666666) internal successors, (147), 17 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:32,858 INFO L276 IsEmpty]: Start isEmpty. Operand 19561 states and 34969 transitions. [2021-11-07 01:07:32,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:07:32,877 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:07:32,877 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:07:32,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:33,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:33,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:07:33,278 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:07:33,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:07:33,279 INFO L85 PathProgramCache]: Analyzing trace with hash 143057496, now seen corresponding path program 1 times [2021-11-07 01:07:33,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:07:33,279 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1557680332] [2021-11-07 01:07:33,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:33,280 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:07:33,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:07:33,280 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:07:33,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:07:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:34,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:07:34,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:34,934 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:34,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:35,251 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:35,252 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:07:35,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1557680332] [2021-11-07 01:07:35,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1557680332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:07:35,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [453039529] [2021-11-07 01:07:35,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:35,252 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:35,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:07:35,253 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:07:35,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:07:37,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:37,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:07:37,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:37,518 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:37,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:37,737 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:37,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [453039529] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:37,737 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:37,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 01:07:37,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382524960] [2021-11-07 01:07:37,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:07:37,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:37,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:07:37,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:07:37,739 INFO L87 Difference]: Start difference. First operand 19561 states and 34969 transitions. Second operand has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:39,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:07:39,056 INFO L93 Difference]: Finished difference Result 20047 states and 35748 transitions. [2021-11-07 01:07:39,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:07:39,057 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-07 01:07:39,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:07:39,089 INFO L225 Difference]: With dead ends: 20047 [2021-11-07 01:07:39,089 INFO L226 Difference]: Without dead ends: 19662 [2021-11-07 01:07:39,096 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-11-07 01:07:39,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19662 states. [2021-11-07 01:07:40,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19662 to 19557. [2021-11-07 01:07:40,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19557 states, 19555 states have (on average 1.7875735106110968) internal successors, (34956), 19556 states have internal predecessors, (34956), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:40,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19557 states to 19557 states and 34956 transitions. [2021-11-07 01:07:40,515 INFO L78 Accepts]: Start accepts. Automaton has 19557 states and 34956 transitions. Word has length 87 [2021-11-07 01:07:40,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:07:40,515 INFO L470 AbstractCegarLoop]: Abstraction has 19557 states and 34956 transitions. [2021-11-07 01:07:40,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.571428571428571) internal successors, (81), 7 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:40,515 INFO L276 IsEmpty]: Start isEmpty. Operand 19557 states and 34956 transitions. [2021-11-07 01:07:40,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 01:07:40,529 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:07:40,529 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:07:40,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:40,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:40,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:40,930 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:07:40,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:07:40,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1016678291, now seen corresponding path program 1 times [2021-11-07 01:07:40,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:07:40,931 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [105888887] [2021-11-07 01:07:40,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:40,931 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:07:40,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:07:40,932 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:07:40,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:07:42,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:42,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:07:42,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:42,648 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:42,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:42,915 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:42,915 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:07:42,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [105888887] [2021-11-07 01:07:42,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [105888887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:07:42,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [723391072] [2021-11-07 01:07:42,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:42,916 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:42,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:07:42,922 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:07:42,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:07:44,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:44,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:07:44,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:45,276 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:45,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:45,543 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:45,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [723391072] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:45,544 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:45,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:07:45,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919909339] [2021-11-07 01:07:45,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:07:45,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:45,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:07:45,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:07:45,546 INFO L87 Difference]: Start difference. First operand 19557 states and 34956 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:48,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:07:48,902 INFO L93 Difference]: Finished difference Result 19852 states and 35432 transitions. [2021-11-07 01:07:48,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:07:48,902 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-07 01:07:48,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:07:48,934 INFO L225 Difference]: With dead ends: 19852 [2021-11-07 01:07:48,934 INFO L226 Difference]: Without dead ends: 19586 [2021-11-07 01:07:48,940 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:07:48,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19586 states. [2021-11-07 01:07:50,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19586 to 19477. [2021-11-07 01:07:50,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19477 states, 19475 states have (on average 1.7881386392811296) internal successors, (34824), 19476 states have internal predecessors, (34824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:50,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19477 states to 19477 states and 34824 transitions. [2021-11-07 01:07:50,397 INFO L78 Accepts]: Start accepts. Automaton has 19477 states and 34824 transitions. Word has length 87 [2021-11-07 01:07:50,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:07:50,397 INFO L470 AbstractCegarLoop]: Abstraction has 19477 states and 34824 transitions. [2021-11-07 01:07:50,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:07:50,397 INFO L276 IsEmpty]: Start isEmpty. Operand 19477 states and 34824 transitions. [2021-11-07 01:07:50,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 01:07:50,410 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:07:50,410 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:07:50,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:07:50,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-07 01:07:50,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:07:50,811 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:07:50,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:07:50,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1103708482, now seen corresponding path program 1 times [2021-11-07 01:07:50,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:07:50,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [129752914] [2021-11-07 01:07:50,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:50,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:07:50,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:07:50,813 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:07:50,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 01:07:52,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:52,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:07:52,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:52,707 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:52,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:52,990 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:07:52,990 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:07:52,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [129752914] [2021-11-07 01:07:52,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [129752914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:07:52,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [663293611] [2021-11-07 01:07:52,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:07:52,992 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:07:52,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:07:53,004 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:07:53,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 01:07:55,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:07:55,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:07:55,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:07:55,659 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:55,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:07:55,951 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:07:55,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [663293611] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:07:55,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:07:55,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:07:55,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022117445] [2021-11-07 01:07:55,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:07:55,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:07:55,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:07:55,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:07:55,953 INFO L87 Difference]: Start difference. First operand 19477 states and 34824 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:02,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:02,019 INFO L93 Difference]: Finished difference Result 20706 states and 36739 transitions. [2021-11-07 01:08:02,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:08:02,019 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-07 01:08:02,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:02,053 INFO L225 Difference]: With dead ends: 20706 [2021-11-07 01:08:02,053 INFO L226 Difference]: Without dead ends: 20473 [2021-11-07 01:08:02,058 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=498, Unknown=0, NotChecked=0, Total=650 [2021-11-07 01:08:02,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20473 states. [2021-11-07 01:08:03,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20473 to 19723. [2021-11-07 01:08:03,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19723 states, 19721 states have (on average 1.7844429795649308) internal successors, (35191), 19722 states have internal predecessors, (35191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:03,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19723 states to 19723 states and 35191 transitions. [2021-11-07 01:08:03,472 INFO L78 Accepts]: Start accepts. Automaton has 19723 states and 35191 transitions. Word has length 88 [2021-11-07 01:08:03,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:03,472 INFO L470 AbstractCegarLoop]: Abstraction has 19723 states and 35191 transitions. [2021-11-07 01:08:03,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 9 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:03,472 INFO L276 IsEmpty]: Start isEmpty. Operand 19723 states and 35191 transitions. [2021-11-07 01:08:03,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-07 01:08:03,487 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:03,487 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:03,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:03,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:03,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:03,892 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:03,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:03,892 INFO L85 PathProgramCache]: Analyzing trace with hash -1093770702, now seen corresponding path program 1 times [2021-11-07 01:08:03,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:03,893 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1724083387] [2021-11-07 01:08:03,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:03,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:03,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:03,894 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:03,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 01:08:05,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:05,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:05,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:05,863 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:05,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:06,147 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:06,147 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:06,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1724083387] [2021-11-07 01:08:06,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1724083387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:06,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [126739293] [2021-11-07 01:08:06,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:06,148 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:06,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:06,149 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:06,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 01:08:08,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:08,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:08:08,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:09,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:09,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:10,131 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:10,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [126739293] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:10,131 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:10,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:08:10,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894633408] [2021-11-07 01:08:10,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:08:10,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:10,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:08:10,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:08:10,133 INFO L87 Difference]: Start difference. First operand 19723 states and 35191 transitions. Second operand has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:29,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:29,111 INFO L93 Difference]: Finished difference Result 50936 states and 90466 transitions. [2021-11-07 01:08:29,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:08:29,111 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-07 01:08:29,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:29,211 INFO L225 Difference]: With dead ends: 50936 [2021-11-07 01:08:29,211 INFO L226 Difference]: Without dead ends: 50565 [2021-11-07 01:08:29,223 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=500, Invalid=1756, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:08:29,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50565 states. [2021-11-07 01:08:32,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50565 to 39162. [2021-11-07 01:08:32,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39162 states, 39160 states have (on average 1.785214504596527) internal successors, (69909), 39161 states have internal predecessors, (69909), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:32,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39162 states to 39162 states and 69909 transitions. [2021-11-07 01:08:32,194 INFO L78 Accepts]: Start accepts. Automaton has 39162 states and 69909 transitions. Word has length 88 [2021-11-07 01:08:32,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:32,194 INFO L470 AbstractCegarLoop]: Abstraction has 39162 states and 69909 transitions. [2021-11-07 01:08:32,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.333333333333334) internal successors, (150), 17 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:32,195 INFO L276 IsEmpty]: Start isEmpty. Operand 39162 states and 69909 transitions. [2021-11-07 01:08:32,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:08:32,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:32,233 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:32,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:32,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:32,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:32,636 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:32,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:32,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1267818050, now seen corresponding path program 1 times [2021-11-07 01:08:32,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:32,637 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1156263695] [2021-11-07 01:08:32,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:32,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:32,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:32,638 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:32,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:08:34,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:34,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:34,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:34,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:34,565 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:34,565 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:34,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1156263695] [2021-11-07 01:08:34,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1156263695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:34,566 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [153389121] [2021-11-07 01:08:34,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:34,566 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:34,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:34,567 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:34,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 01:08:36,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:36,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:08:36,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:36,871 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:36,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:37,141 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:37,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [153389121] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:37,142 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:37,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 01:08:37,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102230809] [2021-11-07 01:08:37,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:08:37,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:37,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:08:37,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:08:37,143 INFO L87 Difference]: Start difference. First operand 39162 states and 69909 transitions. Second operand has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:40,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:40,538 INFO L93 Difference]: Finished difference Result 42290 states and 74747 transitions. [2021-11-07 01:08:40,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:08:40,539 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-07 01:08:40,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:40,613 INFO L225 Difference]: With dead ends: 42290 [2021-11-07 01:08:40,613 INFO L226 Difference]: Without dead ends: 41646 [2021-11-07 01:08:40,621 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:08:40,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41646 states. [2021-11-07 01:08:43,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41646 to 39820. [2021-11-07 01:08:43,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39820 states, 39818 states have (on average 1.781304937465468) internal successors, (70928), 39819 states have internal predecessors, (70928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:43,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39820 states to 39820 states and 70928 transitions. [2021-11-07 01:08:43,720 INFO L78 Accepts]: Start accepts. Automaton has 39820 states and 70928 transitions. Word has length 89 [2021-11-07 01:08:43,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:43,721 INFO L470 AbstractCegarLoop]: Abstraction has 39820 states and 70928 transitions. [2021-11-07 01:08:43,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:43,721 INFO L276 IsEmpty]: Start isEmpty. Operand 39820 states and 70928 transitions. [2021-11-07 01:08:43,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 01:08:43,779 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:43,779 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:43,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:44,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:44,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:44,188 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:44,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:44,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1389606117, now seen corresponding path program 1 times [2021-11-07 01:08:44,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:44,189 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [339088928] [2021-11-07 01:08:44,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:44,189 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:44,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:44,190 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:44,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-07 01:08:45,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:45,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:45,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:45,975 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:45,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:46,235 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:46,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:46,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [339088928] [2021-11-07 01:08:46,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [339088928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:46,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [501547970] [2021-11-07 01:08:46,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:46,236 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:46,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:46,237 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:46,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-07 01:08:48,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:48,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-07 01:08:48,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:48,681 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:48,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:48,894 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:08:48,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [501547970] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:48,894 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:48,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:08:48,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612957062] [2021-11-07 01:08:48,895 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:08:48,895 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:48,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:08:48,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:08:48,896 INFO L87 Difference]: Start difference. First operand 39820 states and 70928 transitions. Second operand has 9 states, 9 states have (on average 9.333333333333334) internal successors, (84), 9 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:52,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:52,450 INFO L93 Difference]: Finished difference Result 40966 states and 72695 transitions. [2021-11-07 01:08:52,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 01:08:52,451 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.333333333333334) internal successors, (84), 9 states have internal predecessors, (84), 0 states have call successors, (0), 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 90 [2021-11-07 01:08:52,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:52,516 INFO L225 Difference]: With dead ends: 40966 [2021-11-07 01:08:52,517 INFO L226 Difference]: Without dead ends: 39672 [2021-11-07 01:08:52,525 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=471, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:08:52,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39672 states. [2021-11-07 01:08:56,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39672 to 39636. [2021-11-07 01:08:56,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39636 states, 39634 states have (on average 1.7812484230711005) internal successors, (70598), 39635 states have internal predecessors, (70598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:56,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39636 states to 39636 states and 70598 transitions. [2021-11-07 01:08:56,128 INFO L78 Accepts]: Start accepts. Automaton has 39636 states and 70598 transitions. Word has length 90 [2021-11-07 01:08:56,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:56,129 INFO L470 AbstractCegarLoop]: Abstraction has 39636 states and 70598 transitions. [2021-11-07 01:08:56,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.333333333333334) internal successors, (84), 9 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:56,129 INFO L276 IsEmpty]: Start isEmpty. Operand 39636 states and 70598 transitions. [2021-11-07 01:08:56,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 01:08:56,163 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:56,163 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:56,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:56,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:56,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:56,568 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:56,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:56,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1037972807, now seen corresponding path program 1 times [2021-11-07 01:08:56,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:56,568 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1950866404] [2021-11-07 01:08:56,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:56,569 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:56,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:56,570 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:56,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-07 01:08:58,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:58,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:58,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:58,444 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:58,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:58,687 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:58,687 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:58,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1950866404] [2021-11-07 01:08:58,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1950866404] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:58,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1742207576] [2021-11-07 01:08:58,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:58,688 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:58,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:58,688 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:58,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-07 01:09:00,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:00,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:09:00,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:01,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:01,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:01,255 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:01,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1742207576] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:01,255 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:01,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:09:01,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663894352] [2021-11-07 01:09:01,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:01,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:01,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:01,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:09:01,257 INFO L87 Difference]: Start difference. First operand 39636 states and 70598 transitions. Second operand has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:04,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:04,423 INFO L93 Difference]: Finished difference Result 42024 states and 74152 transitions. [2021-11-07 01:09:04,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:09:04,423 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 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 95 [2021-11-07 01:09:04,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:04,482 INFO L225 Difference]: With dead ends: 42024 [2021-11-07 01:09:04,482 INFO L226 Difference]: Without dead ends: 40810 [2021-11-07 01:09:04,490 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 368 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:09:04,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40810 states. [2021-11-07 01:09:07,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40810 to 39668. [2021-11-07 01:09:07,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39668 states, 39666 states have (on average 1.7806181616497756) internal successors, (70630), 39667 states have internal predecessors, (70630), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:07,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39668 states to 39668 states and 70630 transitions. [2021-11-07 01:09:07,694 INFO L78 Accepts]: Start accepts. Automaton has 39668 states and 70630 transitions. Word has length 95 [2021-11-07 01:09:07,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:07,695 INFO L470 AbstractCegarLoop]: Abstraction has 39668 states and 70630 transitions. [2021-11-07 01:09:07,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.25) internal successors, (89), 4 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:07,695 INFO L276 IsEmpty]: Start isEmpty. Operand 39668 states and 70630 transitions. [2021-11-07 01:09:07,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 01:09:07,888 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:07,888 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:07,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:08,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:08,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:08,289 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:08,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:08,289 INFO L85 PathProgramCache]: Analyzing trace with hash 615270981, now seen corresponding path program 1 times [2021-11-07 01:09:08,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:08,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1500110306] [2021-11-07 01:09:08,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:08,290 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:08,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:08,293 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:08,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-07 01:09:10,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:10,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:10,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:10,275 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:09:10,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:10,597 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:09:10,597 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:10,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1500110306] [2021-11-07 01:09:10,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1500110306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:10,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2097005564] [2021-11-07 01:09:10,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:10,598 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:10,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:10,599 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:10,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-07 01:09:13,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:13,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:09:13,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:13,951 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:13,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:14,426 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:14,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2097005564] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:14,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:14,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 01:09:14,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361177802] [2021-11-07 01:09:14,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:09:14,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:14,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:09:14,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:09:14,428 INFO L87 Difference]: Start difference. First operand 39668 states and 70630 transitions. Second operand has 18 states, 18 states have (on average 8.777777777777779) internal successors, (158), 17 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:39,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:39,734 INFO L93 Difference]: Finished difference Result 94596 states and 166715 transitions. [2021-11-07 01:09:39,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:09:39,735 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.777777777777779) internal successors, (158), 17 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2021-11-07 01:09:39,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:39,899 INFO L225 Difference]: With dead ends: 94596 [2021-11-07 01:09:39,899 INFO L226 Difference]: Without dead ends: 93350 [2021-11-07 01:09:39,916 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 354 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=500, Invalid=1756, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:09:39,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93350 states. [2021-11-07 01:09:46,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93350 to 78841. [2021-11-07 01:09:46,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78841 states, 78839 states have (on average 1.7809079262801406) internal successors, (140405), 78840 states have internal predecessors, (140405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:46,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78841 states to 78841 states and 140405 transitions. [2021-11-07 01:09:46,874 INFO L78 Accepts]: Start accepts. Automaton has 78841 states and 140405 transitions. Word has length 95 [2021-11-07 01:09:46,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:46,875 INFO L470 AbstractCegarLoop]: Abstraction has 78841 states and 140405 transitions. [2021-11-07 01:09:46,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.777777777777779) internal successors, (158), 17 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:46,875 INFO L276 IsEmpty]: Start isEmpty. Operand 78841 states and 140405 transitions. [2021-11-07 01:09:46,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 01:09:46,927 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:46,927 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:46,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:47,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:47,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:47,328 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:47,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:47,329 INFO L85 PathProgramCache]: Analyzing trace with hash -1789386485, now seen corresponding path program 1 times [2021-11-07 01:09:47,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:47,330 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [858448394] [2021-11-07 01:09:47,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:47,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:47,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:47,334 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:47,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-07 01:09:49,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:49,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:49,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:49,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:09:49,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:49,801 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:09:49,801 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:49,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [858448394] [2021-11-07 01:09:49,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [858448394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:49,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [143644529] [2021-11-07 01:09:49,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:49,802 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:49,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:49,803 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:49,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc7dcb67-c395-44b1-b5d9-1722bb7821fa/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-07 01:09:52,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:52,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 01:09:52,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:52,786 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:52,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:53,024 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 01:09:53,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [143644529] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:53,024 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:53,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 01:09:53,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266161207] [2021-11-07 01:09:53,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 01:09:53,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:53,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 01:09:53,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:09:53,027 INFO L87 Difference]: Start difference. First operand 78841 states and 140405 transitions. Second operand has 9 states, 9 states have (on average 9.88888888888889) internal successors, (89), 9 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)