./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ba885d2ca843c278430bc3d4272c307ea7df8f1fbcd0da84e81382a8c1939a93 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:56:38,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:56:38,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:56:38,232 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:56:38,233 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:56:38,234 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:56:38,237 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:56:38,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:56:38,242 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:56:38,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:56:38,244 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:56:38,246 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:56:38,246 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:56:38,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:56:38,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:56:38,251 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:56:38,252 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:56:38,254 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:56:38,256 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:56:38,259 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:56:38,261 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:56:38,270 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:56:38,275 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:56:38,276 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:56:38,290 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:56:38,291 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:56:38,291 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:56:38,292 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:56:38,293 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:56:38,294 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:56:38,294 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:56:38,295 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:56:38,296 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:56:38,297 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:56:38,298 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:56:38,299 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:56:38,299 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:56:38,300 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:56:38,300 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:56:38,306 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:56:38,307 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:56:38,308 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 19:56:38,359 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:56:38,359 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:56:38,360 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:56:38,360 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:56:38,361 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:56:38,362 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:56:38,362 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:56:38,362 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:56:38,362 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:56:38,362 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:56:38,363 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:56:38,364 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:56:38,364 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:56:38,364 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:56:38,364 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:56:38,364 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:56:38,365 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:56:38,365 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:56:38,366 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:56:38,366 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:56:38,366 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:56:38,366 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:56:38,367 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:56:38,368 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:56:38,368 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:56:38,369 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:56:38,369 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:56:38,369 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:56:38,369 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:56:38,369 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:56:38,370 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:56:38,370 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:56:38,370 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:56:38,370 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:56:38,370 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:56:38,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:56:38,371 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:56:38,371 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:56:38,371 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:56:38,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:56:38,372 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:56:38,372 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:56:38,372 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_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ba885d2ca843c278430bc3d4272c307ea7df8f1fbcd0da84e81382a8c1939a93 [2021-11-25 19:56:38,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:56:38,688 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:56:38,691 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:56:38,692 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:56:38,693 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:56:38,694 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i [2021-11-25 19:56:38,756 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/1d441e3a4/f71e871c880d4d3796ecb25e5bad0f87/FLAG7322a5994 [2021-11-25 19:56:39,303 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:56:39,304 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i [2021-11-25 19:56:39,329 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/1d441e3a4/f71e871c880d4d3796ecb25e5bad0f87/FLAG7322a5994 [2021-11-25 19:56:39,623 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/1d441e3a4/f71e871c880d4d3796ecb25e5bad0f87 [2021-11-25 19:56:39,627 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:56:39,629 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:56:39,633 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:56:39,633 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:56:39,637 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:56:39,638 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:56:39" (1/1) ... [2021-11-25 19:56:39,640 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53fa240b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:39, skipping insertion in model container [2021-11-25 19:56:39,641 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:56:39" (1/1) ... [2021-11-25 19:56:39,648 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:56:39,701 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:56:40,114 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:56:40,123 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) [2021-11-25 19:56:40,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@44a73c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:40, skipping insertion in model container [2021-11-25 19:56:40,124 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:56:40,124 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-25 19:56:40,126 INFO L158 Benchmark]: Toolchain (without parser) took 495.72ms. Allocated memory is still 132.1MB. Free memory was 90.7MB in the beginning and 103.5MB in the end (delta: -12.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 19:56:40,127 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 132.1MB. Free memory is still 108.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:56:40,128 INFO L158 Benchmark]: CACSL2BoogieTranslator took 491.28ms. Allocated memory is still 132.1MB. Free memory was 90.5MB in the beginning and 103.5MB in the end (delta: -13.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 19:56:40,130 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 132.1MB. Free memory is still 108.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 491.28ms. Allocated memory is still 132.1MB. Free memory was 90.5MB in the beginning and 103.5MB in the end (delta: -13.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 526]: 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_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ba885d2ca843c278430bc3d4272c307ea7df8f1fbcd0da84e81382a8c1939a93 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:56:42,367 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:56:42,369 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:56:42,421 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:56:42,422 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:56:42,426 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:56:42,428 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:56:42,436 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:56:42,439 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:56:42,449 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:56:42,450 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:56:42,450 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:56:42,451 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:56:42,451 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:56:42,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:56:42,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:56:42,454 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:56:42,455 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:56:42,457 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:56:42,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:56:42,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:56:42,465 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:56:42,467 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:56:42,471 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:56:42,478 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:56:42,479 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:56:42,479 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:56:42,480 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:56:42,483 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:56:42,484 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:56:42,485 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:56:42,486 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:56:42,488 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:56:42,489 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:56:42,490 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:56:42,491 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:56:42,492 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:56:42,492 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:56:42,493 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:56:42,494 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:56:42,496 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:56:42,499 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-25 19:56:42,537 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:56:42,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:56:42,540 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:56:42,540 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:56:42,541 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:56:42,542 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:56:42,542 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:56:42,542 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:56:42,542 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:56:42,543 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:56:42,544 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:56:42,544 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:56:42,546 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:56:42,546 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:56:42,546 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:56:42,546 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:56:42,547 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:56:42,547 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:56:42,547 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:56:42,547 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:56:42,547 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:56:42,548 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:56:42,548 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:56:42,548 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:56:42,548 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:56:42,549 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 19:56:42,549 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 19:56:42,549 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:56:42,549 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:56:42,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:56:42,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 19:56:42,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:56:42,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:56:42,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:56:42,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:56:42,551 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 19:56:42,552 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 19:56:42,552 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:56:42,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:56:42,552 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_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ba885d2ca843c278430bc3d4272c307ea7df8f1fbcd0da84e81382a8c1939a93 [2021-11-25 19:56:42,962 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:56:42,995 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:56:42,997 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:56:42,999 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:56:43,000 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:56:43,003 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i [2021-11-25 19:56:43,088 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/735bfc192/f86d2fc601b441dea82636cddc33900f/FLAG71849ddd8 [2021-11-25 19:56:43,686 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:56:43,690 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/sv-benchmarks/c/array-memsafety/java_BubbleSort-alloca-1.i [2021-11-25 19:56:43,708 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/735bfc192/f86d2fc601b441dea82636cddc33900f/FLAG71849ddd8 [2021-11-25 19:56:43,949 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/data/735bfc192/f86d2fc601b441dea82636cddc33900f [2021-11-25 19:56:43,953 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:56:43,955 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:56:43,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:56:43,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:56:43,962 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:56:43,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:56:43" (1/1) ... [2021-11-25 19:56:43,965 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4de290a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:43, skipping insertion in model container [2021-11-25 19:56:43,965 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:56:43" (1/1) ... [2021-11-25 19:56:43,973 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:56:44,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:56:44,428 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:56:44,438 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-25 19:56:44,446 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:56:44,478 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:56:44,488 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:56:44,556 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:56:44,601 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:56:44,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44 WrapperNode [2021-11-25 19:56:44,602 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:56:44,603 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:56:44,604 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:56:44,604 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:56:44,611 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,654 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,676 INFO L137 Inliner]: procedures = 117, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 63 [2021-11-25 19:56:44,677 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:56:44,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:56:44,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:56:44,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:56:44,686 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,686 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,690 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,704 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,708 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,722 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:56:44,723 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:56:44,723 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:56:44,723 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:56:44,724 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (1/1) ... [2021-11-25 19:56:44,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:56:44,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:44,766 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:56:44,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:56:44,814 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-25 19:56:44,814 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:56:44,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:56:44,814 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-25 19:56:44,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:56:44,814 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:56:44,938 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:56:44,939 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:56:45,343 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:56:45,349 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:56:45,349 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 19:56:45,351 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:56:45 BoogieIcfgContainer [2021-11-25 19:56:45,351 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:56:45,353 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:56:45,353 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:56:45,356 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:56:45,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:56:43" (1/3) ... [2021-11-25 19:56:45,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@555dfdd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:56:45, skipping insertion in model container [2021-11-25 19:56:45,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:56:44" (2/3) ... [2021-11-25 19:56:45,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@555dfdd8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:56:45, skipping insertion in model container [2021-11-25 19:56:45,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:56:45" (3/3) ... [2021-11-25 19:56:45,359 INFO L111 eAbstractionObserver]: Analyzing ICFG java_BubbleSort-alloca-1.i [2021-11-25 19:56:45,379 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:56:45,379 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 15 error locations. [2021-11-25 19:56:45,426 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:56:45,441 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-11-25 19:56:45,441 INFO L340 AbstractCegarLoop]: Starting to check reachability of 15 error locations. [2021-11-25 19:56:45,456 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 25 states have (on average 1.92) internal successors, (48), 40 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) [2021-11-25 19:56:45,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:56:45,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:45,463 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:56:45,463 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:45,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:45,469 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-11-25 19:56:45,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:45,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1527623783] [2021-11-25 19:56:45,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:45,483 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:45,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:45,486 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:45,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 19:56:45,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:45,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:56:45,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:45,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:45,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:45,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:45,787 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:45,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1527623783] [2021-11-25 19:56:45,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1527623783] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:45,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:45,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:56:45,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578709279] [2021-11-25 19:56:45,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:45,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:56:45,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:45,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:56:45,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:56:45,849 INFO L87 Difference]: Start difference. First operand has 41 states, 25 states have (on average 1.92) internal successors, (48), 40 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) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:45,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:45,987 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-11-25 19:56:45,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:56:45,991 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-25 19:56:45,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:46,008 INFO L225 Difference]: With dead ends: 40 [2021-11-25 19:56:46,009 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 19:56:46,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:56:46,015 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 34 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:46,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 31 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:46,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 19:56:46,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-25 19:56:46,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.75) internal successors, (42), 37 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:46,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-11-25 19:56:46,054 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 6 [2021-11-25 19:56:46,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:46,055 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-11-25 19:56:46,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:46,056 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-11-25 19:56:46,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:56:46,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:46,057 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:56:46,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:46,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:46,270 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:46,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:46,271 INFO L85 PathProgramCache]: Analyzing trace with hash 889508874, now seen corresponding path program 1 times [2021-11-25 19:56:46,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:46,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1697053562] [2021-11-25 19:56:46,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:46,272 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:46,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:46,276 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:46,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 19:56:46,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:46,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:56:46,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:46,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:46,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:46,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:46,416 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:46,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1697053562] [2021-11-25 19:56:46,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1697053562] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:46,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:46,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:56:46,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86073160] [2021-11-25 19:56:46,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:46,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:56:46,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:46,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:56:46,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:46,421 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:46,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:46,809 INFO L93 Difference]: Finished difference Result 77 states and 84 transitions. [2021-11-25 19:56:46,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:56:46,811 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-25 19:56:46,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:46,812 INFO L225 Difference]: With dead ends: 77 [2021-11-25 19:56:46,812 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 19:56:46,813 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:56:46,823 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 43 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:46,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 145 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:56:46,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 19:56:46,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 41. [2021-11-25 19:56:46,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 40 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:46,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-11-25 19:56:46,832 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 6 [2021-11-25 19:56:46,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:46,832 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-11-25 19:56:46,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:46,833 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-11-25 19:56:46,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:56:46,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:46,833 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:56:46,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:47,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,045 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:47,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:47,046 INFO L85 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-11-25 19:56:47,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:47,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [61970299] [2021-11-25 19:56:47,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:47,047 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:47,048 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:47,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 19:56:47,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:47,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:56:47,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:47,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:47,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:47,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:47,272 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:47,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [61970299] [2021-11-25 19:56:47,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [61970299] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:47,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:47,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:56:47,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991096505] [2021-11-25 19:56:47,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:47,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:56:47,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:47,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:56:47,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:47,275 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:47,314 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2021-11-25 19:56:47,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:56:47,315 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-25 19:56:47,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:47,316 INFO L225 Difference]: With dead ends: 43 [2021-11-25 19:56:47,316 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 19:56:47,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:56:47,319 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 1 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:47,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 94 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2021-11-25 19:56:47,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 19:56:47,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-11-25 19:56:47,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.6785714285714286) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-11-25 19:56:47,325 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 6 [2021-11-25 19:56:47,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:47,325 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-11-25 19:56:47,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,326 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-11-25 19:56:47,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 19:56:47,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:47,327 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:47,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:47,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,540 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:47,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:47,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1184052082, now seen corresponding path program 1 times [2021-11-25 19:56:47,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:47,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1271505742] [2021-11-25 19:56:47,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:47,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:47,543 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:47,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 19:56:47,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:47,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:56:47,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:47,646 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:47,646 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:47,647 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:47,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1271505742] [2021-11-25 19:56:47,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1271505742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:47,647 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:47,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:56:47,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213356325] [2021-11-25 19:56:47,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:47,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:56:47,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:47,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:56:47,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:47,650 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:47,698 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2021-11-25 19:56:47,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:56:47,699 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 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 9 [2021-11-25 19:56:47,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:47,700 INFO L225 Difference]: With dead ends: 44 [2021-11-25 19:56:47,700 INFO L226 Difference]: Without dead ends: 44 [2021-11-25 19:56:47,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:47,702 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 44 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:47,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 68 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:56:47,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-25 19:56:47,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2021-11-25 19:56:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-25 19:56:47,712 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 9 [2021-11-25 19:56:47,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:47,712 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-25 19:56:47,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:47,712 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-25 19:56:47,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:56:47,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:47,713 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:47,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:47,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,924 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:47,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:47,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1091210163, now seen corresponding path program 1 times [2021-11-25 19:56:47,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:47,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [73974149] [2021-11-25 19:56:47,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:47,926 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:47,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:47,927 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:47,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 19:56:47,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:47,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:56:47,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:48,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,173 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:48,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [73974149] [2021-11-25 19:56:48,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [73974149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:48,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [191376562] [2021-11-25 19:56:48,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:48,174 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:56:48,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:56:48,179 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:56:48,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-25 19:56:48,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:48,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:56:48,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:48,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [191376562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:48,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133284370] [2021-11-25 19:56:48,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:48,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:48,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:48,357 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:48,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:56:48,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:48,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:56:48,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:48,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:48,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133284370] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:48,492 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:56:48,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-25 19:56:48,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709561565] [2021-11-25 19:56:48,492 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:48,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:56:48,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:48,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:56:48,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:56:48,493 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:48,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:48,574 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2021-11-25 19:56:48,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:56:48,587 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 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 10 [2021-11-25 19:56:48,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:48,588 INFO L225 Difference]: With dead ends: 75 [2021-11-25 19:56:48,588 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 19:56:48,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:56:48,589 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 71 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:48,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 167 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:48,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 19:56:48,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 46. [2021-11-25 19:56:48,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 32 states have (on average 1.5625) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:48,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-25 19:56:48,596 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 10 [2021-11-25 19:56:48,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:48,596 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-25 19:56:48,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:48,596 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-25 19:56:48,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:56:48,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:48,597 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:48,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:48,803 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (7)] Ended with exit code 0 [2021-11-25 19:56:49,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:49,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:49,198 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:49,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:49,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-11-25 19:56:49,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:49,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [386039048] [2021-11-25 19:56:49,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:49,200 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:49,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:49,201 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:49,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 19:56:49,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:49,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:56:49,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:49,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:49,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:50,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:50,064 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:50,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [386039048] [2021-11-25 19:56:50,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [386039048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:50,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [105522746] [2021-11-25 19:56:50,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:50,065 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:56:50,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:56:50,066 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:56:50,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-25 19:56:50,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:50,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:56:50,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:50,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:50,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:50,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:50,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [105522746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:50,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321387073] [2021-11-25 19:56:50,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:50,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:50,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:56:50,646 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:56:50,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:56:50,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:50,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:56:50,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:50,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:50,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:50,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:51,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:51,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321387073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:51,091 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:56:51,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2021-11-25 19:56:51,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238942610] [2021-11-25 19:56:51,092 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:56:51,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:56:51,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:51,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:56:51,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:56:51,097 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:52,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:52,000 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2021-11-25 19:56:52,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:56:52,001 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 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 10 [2021-11-25 19:56:52,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:52,002 INFO L225 Difference]: With dead ends: 83 [2021-11-25 19:56:52,002 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 19:56:52,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:56:52,003 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 173 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:52,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 133 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 122 Invalid, 0 Unknown, 4 Unchecked, 0.8s Time] [2021-11-25 19:56:52,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 19:56:52,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 54. [2021-11-25 19:56:52,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.5) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:52,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2021-11-25 19:56:52,009 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 10 [2021-11-25 19:56:52,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:52,010 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2021-11-25 19:56:52,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:52,010 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2021-11-25 19:56:52,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:56:52,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:52,011 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:52,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:52,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (10)] Ended with exit code 0 [2021-11-25 19:56:52,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:52,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:56:52,622 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:52,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:52,622 INFO L85 PathProgramCache]: Analyzing trace with hash 363893197, now seen corresponding path program 1 times [2021-11-25 19:56:52,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:52,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [544713443] [2021-11-25 19:56:52,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:52,623 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:52,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:52,624 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:52,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 19:56:52,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:52,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:56:52,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:54,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:54,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:54,853 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:54,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [544713443] [2021-11-25 19:56:54,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [544713443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:54,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:54,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:56:54,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392883389] [2021-11-25 19:56:54,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:54,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:56:54,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:54,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:56:54,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=11, Unknown=1, NotChecked=0, Total=20 [2021-11-25 19:56:54,855 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:54,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:54,963 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-11-25 19:56:54,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:56:54,964 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 19:56:54,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:54,965 INFO L225 Difference]: With dead ends: 61 [2021-11-25 19:56:54,965 INFO L226 Difference]: Without dead ends: 59 [2021-11-25 19:56:54,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=8, Invalid=11, Unknown=1, NotChecked=0, Total=20 [2021-11-25 19:56:54,966 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:54,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 99 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-25 19:56:54,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-25 19:56:54,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2021-11-25 19:56:54,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.4883720930232558) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-11-25 19:56:54,972 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 13 [2021-11-25 19:56:54,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:54,972 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-11-25 19:56:54,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:54,973 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-11-25 19:56:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:56:54,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:54,973 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:54,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:55,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:55,174 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:55,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:55,175 INFO L85 PathProgramCache]: Analyzing trace with hash 363893999, now seen corresponding path program 1 times [2021-11-25 19:56:55,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:55,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1328180657] [2021-11-25 19:56:55,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:55,175 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:55,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:55,176 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:55,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-25 19:56:55,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:55,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:56:55,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:55,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:55,296 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:55,296 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:55,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1328180657] [2021-11-25 19:56:55,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1328180657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:55,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:55,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:56:55,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325695841] [2021-11-25 19:56:55,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:55,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:56:55,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:55,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:56:55,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:55,299 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:55,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:55,338 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2021-11-25 19:56:55,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:56:55,339 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 19:56:55,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:55,340 INFO L225 Difference]: With dead ends: 59 [2021-11-25 19:56:55,340 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 19:56:55,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:56:55,341 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 1 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:55,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 106 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:56:55,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 19:56:55,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-25 19:56:55,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 50 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:55,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-11-25 19:56:55,346 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 13 [2021-11-25 19:56:55,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:55,347 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-11-25 19:56:55,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:55,347 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-11-25 19:56:55,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:56:55,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:55,348 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:55,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:55,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:55,559 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:55,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:55,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1064958577, now seen corresponding path program 1 times [2021-11-25 19:56:55,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:55,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1128973557] [2021-11-25 19:56:55,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:55,561 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:55,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:55,562 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:55,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 19:56:55,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:55,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:56:55,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:55,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 19:56:55,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:55,668 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:55,668 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:55,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1128973557] [2021-11-25 19:56:55,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1128973557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:55,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:55,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:56:55,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834667905] [2021-11-25 19:56:55,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:55,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:56:55,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:55,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:56:55,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:56:55,671 INFO L87 Difference]: Start difference. First operand 51 states and 57 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:55,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:55,831 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-11-25 19:56:55,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:56:55,832 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 19:56:55,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:55,833 INFO L225 Difference]: With dead ends: 45 [2021-11-25 19:56:55,833 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 19:56:55,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:56:55,834 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 44 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:55,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 25 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:56:55,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 19:56:55,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 19:56:55,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 44 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) [2021-11-25 19:56:55,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-25 19:56:55,838 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 13 [2021-11-25 19:56:55,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:55,838 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-25 19:56:55,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:55,839 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-25 19:56:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:56:55,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:55,839 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:55,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:56,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:56,040 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:56,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:56,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1064958578, now seen corresponding path program 1 times [2021-11-25 19:56:56,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:56,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1831782405] [2021-11-25 19:56:56,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:56,041 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:56,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:56,042 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:56,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 19:56:56,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:56,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:56:56,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:56,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:56,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:56,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:56:56,958 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:56,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1831782405] [2021-11-25 19:56:56,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1831782405] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:56:56,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:56:56,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2021-11-25 19:56:56,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583972271] [2021-11-25 19:56:56,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:56,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:56:56,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:56,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:56:56,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:56:56,960 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:57,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:57,504 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-11-25 19:56:57,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:56:57,505 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 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 13 [2021-11-25 19:56:57,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:57,506 INFO L225 Difference]: With dead ends: 51 [2021-11-25 19:56:57,506 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 19:56:57,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:56:57,507 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 75 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:57,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 43 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:56:57,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 19:56:57,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2021-11-25 19:56:57,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:57,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2021-11-25 19:56:57,511 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 13 [2021-11-25 19:56:57,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:57,511 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2021-11-25 19:56:57,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:57,512 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2021-11-25 19:56:57,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:56:57,512 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:57,512 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:57,528 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-11-25 19:56:57,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:57,728 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:57,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:57,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1346022463, now seen corresponding path program 1 times [2021-11-25 19:56:57,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:57,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [174552681] [2021-11-25 19:56:57,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:57,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:57,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:57,732 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:57,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-25 19:56:57,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:57,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:56:57,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:57,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:58,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:58,091 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:56:58,091 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:58,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [174552681] [2021-11-25 19:56:58,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [174552681] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:56:58,091 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:56:58,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:56:58,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181562628] [2021-11-25 19:56:58,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:56:58,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:56:58,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:56:58,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:56:58,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:56:58,093 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:58,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:56:58,322 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-11-25 19:56:58,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:56:58,323 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2021-11-25 19:56:58,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:56:58,323 INFO L225 Difference]: With dead ends: 49 [2021-11-25 19:56:58,323 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 19:56:58,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:56:58,324 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 13 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:56:58,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 66 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 20 Unchecked, 0.1s Time] [2021-11-25 19:56:58,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 19:56:58,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-25 19:56:58,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 43 states have (on average 1.3255813953488371) internal successors, (57), 48 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:58,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-11-25 19:56:58,328 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 14 [2021-11-25 19:56:58,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:56:58,329 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-11-25 19:56:58,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:56:58,329 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-11-25 19:56:58,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 19:56:58,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:56:58,330 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:56:58,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:56:58,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:56:58,541 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:56:58,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:56:58,541 INFO L85 PathProgramCache]: Analyzing trace with hash -1570446787, now seen corresponding path program 1 times [2021-11-25 19:56:58,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:56:58,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [663233926] [2021-11-25 19:56:58,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:58,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:56:58,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:56:58,543 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:56:58,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-25 19:56:58,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:56:58,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:56:58,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:56:58,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:56:58,955 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:58,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:56:59,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:56:59,985 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:56:59,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [663233926] [2021-11-25 19:56:59,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [663233926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:56:59,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [610332818] [2021-11-25 19:56:59,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:56:59,986 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:56:59,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:56:59,990 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:00,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-25 19:57:00,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:00,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:57:00,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:00,407 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:00,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:00,736 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:00,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [610332818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:00,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625344051] [2021-11-25 19:57:00,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:00,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:00,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:00,739 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:00,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:57:00,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:00,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:57:00,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:00,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:01,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:02,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:02,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625344051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:02,500 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:02,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 6, 6, 7] total 29 [2021-11-25 19:57:02,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811615075] [2021-11-25 19:57:02,500 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:02,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 19:57:02,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:02,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 19:57:02,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:57:02,502 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 29 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) [2021-11-25 19:57:04,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:04,493 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-11-25 19:57:04,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 19:57:04,495 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 29 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 17 [2021-11-25 19:57:04,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:04,495 INFO L225 Difference]: With dead ends: 56 [2021-11-25 19:57:04,495 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 19:57:04,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=269, Invalid=1291, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 19:57:04,497 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 86 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:04,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 164 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 271 Invalid, 0 Unknown, 10 Unchecked, 1.2s Time] [2021-11-25 19:57:04,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 19:57:04,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2021-11-25 19:57:04,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 44 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) [2021-11-25 19:57:04,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-25 19:57:04,502 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 17 [2021-11-25 19:57:04,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:04,503 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-25 19:57:04,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.6206896551724137) internal successors, (76), 29 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) [2021-11-25 19:57:04,503 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-25 19:57:04,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 19:57:04,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:04,504 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-25 19:57:04,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:04,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:04,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-11-25 19:57:05,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:57:05,107 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:05,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:05,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1817992175, now seen corresponding path program 2 times [2021-11-25 19:57:05,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:05,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [49735526] [2021-11-25 19:57:05,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:57:05,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:05,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:05,109 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:05,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-25 19:57:05,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:57:05,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:05,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:57:05,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:05,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:05,579 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:05,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:06,711 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:06,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [49735526] [2021-11-25 19:57:06,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [49735526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:06,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1788543940] [2021-11-25 19:57:06,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:57:06,712 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:06,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:57:06,713 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:06,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-25 19:57:06,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:57:06,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:06,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:57:06,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:06,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:07,193 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:07,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:07,644 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:07,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1788543940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:07,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943955214] [2021-11-25 19:57:07,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:57:07,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:07,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:07,653 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:07,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 19:57:07,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:57:07,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:57:07,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:57:07,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:07,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:08,055 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:08,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:09,259 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:09,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943955214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:09,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:09,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 24 [2021-11-25 19:57:09,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480670133] [2021-11-25 19:57:09,260 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:09,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:57:09,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:09,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:57:09,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=425, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:57:09,262 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:12,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:12,146 INFO L93 Difference]: Finished difference Result 165 states and 191 transitions. [2021-11-25 19:57:12,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:57:12,148 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-25 19:57:12,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:12,150 INFO L225 Difference]: With dead ends: 165 [2021-11-25 19:57:12,150 INFO L226 Difference]: Without dead ends: 165 [2021-11-25 19:57:12,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=292, Invalid=700, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:57:12,152 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 335 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:12,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 296 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 302 Invalid, 0 Unknown, 38 Unchecked, 1.4s Time] [2021-11-25 19:57:12,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-25 19:57:12,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 61. [2021-11-25 19:57:12,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 57 states have (on average 1.2456140350877194) internal successors, (71), 60 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) [2021-11-25 19:57:12,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-11-25 19:57:12,158 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 18 [2021-11-25 19:57:12,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:12,158 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-11-25 19:57:12,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:12,158 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-11-25 19:57:12,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:57:12,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:12,160 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:57:12,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:12,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:12,582 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-25 19:57:12,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:12,762 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:12,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:12,762 INFO L85 PathProgramCache]: Analyzing trace with hash 1609733735, now seen corresponding path program 1 times [2021-11-25 19:57:12,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:12,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [440197970] [2021-11-25 19:57:12,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:12,763 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:12,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:12,764 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:12,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-25 19:57:12,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:12,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:57:12,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:12,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:13,240 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:13,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:14,073 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:14,073 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:14,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [440197970] [2021-11-25 19:57:14,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [440197970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:14,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1337259837] [2021-11-25 19:57:14,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:14,074 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:14,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:57:14,075 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:14,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-25 19:57:14,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:14,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:57:14,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:14,684 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:14,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:15,563 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:15,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1337259837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:15,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418274292] [2021-11-25 19:57:15,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:15,564 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:15,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:15,570 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:15,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 19:57:15,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:15,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:57:15,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:15,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:15,972 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:15,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:16,374 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:16,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418274292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:16,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:16,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 11, 10, 7, 6] total 29 [2021-11-25 19:57:16,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314318171] [2021-11-25 19:57:16,375 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:16,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 19:57:16,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:16,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 19:57:16,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:57:16,377 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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) [2021-11-25 19:57:18,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:18,090 INFO L93 Difference]: Finished difference Result 87 states and 104 transitions. [2021-11-25 19:57:18,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:57:18,092 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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 22 [2021-11-25 19:57:18,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:18,093 INFO L225 Difference]: With dead ends: 87 [2021-11-25 19:57:18,093 INFO L226 Difference]: Without dead ends: 87 [2021-11-25 19:57:18,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=206, Invalid=1276, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 19:57:18,095 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:18,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 259 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 88 Invalid, 0 Unknown, 38 Unchecked, 0.4s Time] [2021-11-25 19:57:18,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-25 19:57:18,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 80. [2021-11-25 19:57:18,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 76 states have (on average 1.2763157894736843) internal successors, (97), 79 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:18,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 97 transitions. [2021-11-25 19:57:18,101 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 97 transitions. Word has length 22 [2021-11-25 19:57:18,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:18,101 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 97 transitions. [2021-11-25 19:57:18,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.4482758620689653) internal successors, (71), 29 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) [2021-11-25 19:57:18,101 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 97 transitions. [2021-11-25 19:57:18,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:57:18,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:18,103 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:57:18,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:18,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:18,535 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-25 19:57:18,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:18,714 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:18,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:18,715 INFO L85 PathProgramCache]: Analyzing trace with hash -914742659, now seen corresponding path program 1 times [2021-11-25 19:57:18,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:18,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [322460335] [2021-11-25 19:57:18,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:18,715 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:18,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:18,716 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:18,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-25 19:57:18,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:18,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:57:18,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:18,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:19,311 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:57:19,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:20,187 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:57:20,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:20,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [322460335] [2021-11-25 19:57:20,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [322460335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:20,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [997637563] [2021-11-25 19:57:20,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:20,188 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:20,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:57:20,192 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:20,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-25 19:57:20,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:20,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:57:20,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:20,719 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:57:20,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:21,538 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:57:21,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [997637563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:21,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636747033] [2021-11-25 19:57:21,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:21,538 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:21,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:21,539 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:21,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 19:57:21,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:21,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:57:21,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:21,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:21,937 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:57:21,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:22,352 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:57:22,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636747033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:22,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:22,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 10, 9, 7, 6] total 27 [2021-11-25 19:57:22,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710276924] [2021-11-25 19:57:22,353 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:22,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 19:57:22,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:22,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 19:57:22,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-11-25 19:57:22,355 INFO L87 Difference]: Start difference. First operand 80 states and 97 transitions. Second operand has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 27 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) [2021-11-25 19:57:24,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:24,268 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2021-11-25 19:57:24,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 19:57:24,270 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 27 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 25 [2021-11-25 19:57:24,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:24,271 INFO L225 Difference]: With dead ends: 105 [2021-11-25 19:57:24,271 INFO L226 Difference]: Without dead ends: 105 [2021-11-25 19:57:24,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 122 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=246, Invalid=1476, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 19:57:24,272 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 24 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:24,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 197 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 36 Unchecked, 0.4s Time] [2021-11-25 19:57:24,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-25 19:57:24,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 84. [2021-11-25 19:57:24,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 80 states have (on average 1.275) internal successors, (102), 83 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:24,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 102 transitions. [2021-11-25 19:57:24,289 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 102 transitions. Word has length 25 [2021-11-25 19:57:24,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:24,289 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 102 transitions. [2021-11-25 19:57:24,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.740740740740741) internal successors, (74), 27 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) [2021-11-25 19:57:24,290 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 102 transitions. [2021-11-25 19:57:24,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:57:24,291 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:24,291 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:57:24,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:24,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-11-25 19:57:24,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-25 19:57:24,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:24,903 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:24,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:24,903 INFO L85 PathProgramCache]: Analyzing trace with hash -2028106434, now seen corresponding path program 1 times [2021-11-25 19:57:24,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:24,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [170466155] [2021-11-25 19:57:24,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:24,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:24,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:24,905 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:24,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-25 19:57:24,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:24,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:57:24,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:25,163 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:57:25,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:57:25,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:25,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [170466155] [2021-11-25 19:57:25,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [170466155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:57:25,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:57:25,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:57:25,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936440752] [2021-11-25 19:57:25,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:57:25,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:57:25,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:25,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:57:25,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:57:25,165 INFO L87 Difference]: Start difference. First operand 84 states and 102 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:25,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:25,191 INFO L93 Difference]: Finished difference Result 99 states and 120 transitions. [2021-11-25 19:57:25,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:57:25,191 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 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 25 [2021-11-25 19:57:25,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:25,192 INFO L225 Difference]: With dead ends: 99 [2021-11-25 19:57:25,192 INFO L226 Difference]: Without dead ends: 97 [2021-11-25 19:57:25,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:57:25,193 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 4 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:25,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 78 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2021-11-25 19:57:25,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-25 19:57:25,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 94. [2021-11-25 19:57:25,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 90 states have (on average 1.288888888888889) internal successors, (116), 93 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:25,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 116 transitions. [2021-11-25 19:57:25,209 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 116 transitions. Word has length 25 [2021-11-25 19:57:25,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:25,209 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 116 transitions. [2021-11-25 19:57:25,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:25,210 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 116 transitions. [2021-11-25 19:57:25,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 19:57:25,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:25,213 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:57:25,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:25,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:57:25,418 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:25,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:25,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1553234866, now seen corresponding path program 1 times [2021-11-25 19:57:25,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:25,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1679288915] [2021-11-25 19:57:25,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:25,419 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:25,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:25,420 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:25,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-25 19:57:25,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:25,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:57:25,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:25,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:26,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:26,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:27,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:27,014 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:27,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1679288915] [2021-11-25 19:57:27,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1679288915] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:27,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1232586496] [2021-11-25 19:57:27,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:27,014 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:27,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:57:27,015 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:27,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-25 19:57:27,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:27,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:57:27,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:27,486 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:27,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:27,959 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:57:27,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1232586496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:27,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000241436] [2021-11-25 19:57:27,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:27,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:27,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:27,960 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:27,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 19:57:28,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:28,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:57:28,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:28,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:28,368 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:28,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:29,566 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:57:29,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000241436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:29,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:29,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 10, 9, 7, 7] total 32 [2021-11-25 19:57:29,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143996861] [2021-11-25 19:57:29,567 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:29,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 19:57:29,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:29,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 19:57:29,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:57:29,568 INFO L87 Difference]: Start difference. First operand 94 states and 116 transitions. Second operand has 32 states, 32 states have (on average 3.21875) internal successors, (103), 32 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:33,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:57:33,399 INFO L93 Difference]: Finished difference Result 129 states and 160 transitions. [2021-11-25 19:57:33,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:57:33,400 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.21875) internal successors, (103), 32 states have internal predecessors, (103), 0 states have call successors, (0), 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 26 [2021-11-25 19:57:33,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:57:33,402 INFO L225 Difference]: With dead ends: 129 [2021-11-25 19:57:33,402 INFO L226 Difference]: Without dead ends: 125 [2021-11-25 19:57:33,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=265, Invalid=1627, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:57:33,403 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 54 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:57:33,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 251 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 135 Invalid, 0 Unknown, 38 Unchecked, 0.5s Time] [2021-11-25 19:57:33,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-25 19:57:33,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 118. [2021-11-25 19:57:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 114 states have (on average 1.3245614035087718) internal successors, (151), 117 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:33,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 151 transitions. [2021-11-25 19:57:33,409 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 151 transitions. Word has length 26 [2021-11-25 19:57:33,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:57:33,409 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 151 transitions. [2021-11-25 19:57:33,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.21875) internal successors, (103), 32 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:57:33,410 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 151 transitions. [2021-11-25 19:57:33,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 19:57:33,410 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:57:33,411 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:57:33,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:33,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-25 19:57:33,819 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-25 19:57:34,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:34,018 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:57:34,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:57:34,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1054837879, now seen corresponding path program 1 times [2021-11-25 19:57:34,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:57:34,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1662379069] [2021-11-25 19:57:34,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:34,019 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:57:34,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:57:34,020 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:57:34,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-25 19:57:34,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:34,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:57:34,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:34,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:36,290 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:36,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:37,997 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:37,997 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:57:37,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1662379069] [2021-11-25 19:57:37,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1662379069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:37,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [779167187] [2021-11-25 19:57:37,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:37,997 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:57:37,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:57:37,998 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:57:37,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-25 19:57:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:38,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:57:38,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:38,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:39,116 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:39,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:41,032 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:57:41,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [779167187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:41,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110836133] [2021-11-25 19:57:41,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:57:41,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:57:41,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:57:41,034 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:57:41,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 19:57:41,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:57:41,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:57:41,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:57:41,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:57:42,178 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:57:42,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:57:45,463 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:57:45,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110836133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:57:45,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:57:45,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 12, 11, 8, 9] total 47 [2021-11-25 19:57:45,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796813268] [2021-11-25 19:57:45,464 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:57:45,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:57:45,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:57:45,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:57:45,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=1958, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 19:57:45,466 INFO L87 Difference]: Start difference. First operand 118 states and 151 transitions. Second operand has 48 states, 47 states have (on average 2.6595744680851063) internal successors, (125), 48 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:05,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:05,936 INFO L93 Difference]: Finished difference Result 305 states and 362 transitions. [2021-11-25 19:58:05,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 19:58:05,937 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.6595744680851063) internal successors, (125), 48 states have internal predecessors, (125), 0 states have call successors, (0), 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 27 [2021-11-25 19:58:05,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:05,938 INFO L225 Difference]: With dead ends: 305 [2021-11-25 19:58:05,939 INFO L226 Difference]: Without dead ends: 305 [2021-11-25 19:58:05,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2757 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=1471, Invalid=7271, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 19:58:05,942 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 543 mSDsluCounter, 645 mSDsCounter, 0 mSdLazyCounter, 1071 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 674 SdHoareTripleChecker+Invalid, 1745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1071 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 580 IncrementalHoareTripleChecker+Unchecked, 7.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:05,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [543 Valid, 674 Invalid, 1745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1071 Invalid, 0 Unknown, 580 Unchecked, 7.8s Time] [2021-11-25 19:58:05,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-11-25 19:58:05,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 174. [2021-11-25 19:58:05,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 170 states have (on average 1.3) internal successors, (221), 173 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:05,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 221 transitions. [2021-11-25 19:58:05,950 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 221 transitions. Word has length 27 [2021-11-25 19:58:05,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:05,950 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 221 transitions. [2021-11-25 19:58:05,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.6595744680851063) internal successors, (125), 48 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:05,951 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 221 transitions. [2021-11-25 19:58:05,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:58:05,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:05,952 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:58:05,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-25 19:58:06,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-25 19:58:06,360 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-25 19:58:06,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:06,554 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:58:06,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:06,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1774535125, now seen corresponding path program 1 times [2021-11-25 19:58:06,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:06,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [736590146] [2021-11-25 19:58:06,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:06,555 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:06,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:06,556 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:06,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-25 19:58:06,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:06,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:58:06,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:06,842 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:58:06,842 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:58:06,842 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:06,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [736590146] [2021-11-25 19:58:06,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [736590146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:58:06,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:58:06,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:58:06,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105903475] [2021-11-25 19:58:06,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:58:06,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:58:06,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:06,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:58:06,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:06,844 INFO L87 Difference]: Start difference. First operand 174 states and 221 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:06,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:06,849 INFO L93 Difference]: Finished difference Result 173 states and 220 transitions. [2021-11-25 19:58:06,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:58:06,849 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 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 31 [2021-11-25 19:58:06,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:06,850 INFO L225 Difference]: With dead ends: 173 [2021-11-25 19:58:06,850 INFO L226 Difference]: Without dead ends: 171 [2021-11-25 19:58:06,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:58:06,851 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 4 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:06,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 41 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2021-11-25 19:58:06,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-25 19:58:06,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2021-11-25 19:58:06,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 168 states have (on average 1.2857142857142858) internal successors, (216), 170 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:06,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 216 transitions. [2021-11-25 19:58:06,858 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 216 transitions. Word has length 31 [2021-11-25 19:58:06,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:06,858 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 216 transitions. [2021-11-25 19:58:06,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:06,858 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 216 transitions. [2021-11-25 19:58:06,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:58:06,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:06,862 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:06,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:07,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:07,070 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:58:07,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:07,070 INFO L85 PathProgramCache]: Analyzing trace with hash -823961093, now seen corresponding path program 1 times [2021-11-25 19:58:07,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:07,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1709981980] [2021-11-25 19:58:07,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:07,071 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:07,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:07,072 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:07,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-25 19:58:07,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:07,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:58:07,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:07,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:07,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:08,385 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:08,385 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:08,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1709981980] [2021-11-25 19:58:08,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1709981980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:08,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1846190551] [2021-11-25 19:58:08,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:08,385 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:08,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:08,387 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:08,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-25 19:58:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:08,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:58:08,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:08,936 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:08,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:09,493 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:09,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1846190551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:09,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305498044] [2021-11-25 19:58:09,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:09,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:09,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:09,494 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:09,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 19:58:09,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:09,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:58:09,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:09,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:09,921 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:09,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:11,186 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:11,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305498044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:11,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:58:11,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 10, 9, 7, 7] total 32 [2021-11-25 19:58:11,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835570550] [2021-11-25 19:58:11,186 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:11,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 19:58:11,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:11,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 19:58:11,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:58:11,188 INFO L87 Difference]: Start difference. First operand 171 states and 216 transitions. Second operand has 32 states, 32 states have (on average 4.3125) internal successors, (138), 32 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:16,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:16,091 INFO L93 Difference]: Finished difference Result 185 states and 225 transitions. [2021-11-25 19:58:16,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 19:58:16,092 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 4.3125) internal successors, (138), 32 states have internal predecessors, (138), 0 states have call successors, (0), 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 32 [2021-11-25 19:58:16,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:16,093 INFO L225 Difference]: With dead ends: 185 [2021-11-25 19:58:16,094 INFO L226 Difference]: Without dead ends: 181 [2021-11-25 19:58:16,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 167 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=358, Invalid=2092, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 19:58:16,095 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 75 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:16,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 181 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 104 Invalid, 0 Unknown, 85 Unchecked, 0.3s Time] [2021-11-25 19:58:16,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-25 19:58:16,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 143. [2021-11-25 19:58:16,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 140 states have (on average 1.2) internal successors, (168), 142 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:16,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 168 transitions. [2021-11-25 19:58:16,101 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 168 transitions. Word has length 32 [2021-11-25 19:58:16,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:16,102 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 168 transitions. [2021-11-25 19:58:16,102 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 4.3125) internal successors, (138), 32 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:16,102 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 168 transitions. [2021-11-25 19:58:16,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 19:58:16,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:16,103 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:16,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:16,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-25 19:58:16,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-25 19:58:16,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:16,706 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:58:16,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:16,706 INFO L85 PathProgramCache]: Analyzing trace with hash 549279776, now seen corresponding path program 1 times [2021-11-25 19:58:16,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:16,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [591816967] [2021-11-25 19:58:16,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:16,706 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:16,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:16,707 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:16,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-25 19:58:16,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:16,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:58:16,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:16,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:17,627 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:17,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:19,320 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:19,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:19,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [591816967] [2021-11-25 19:58:19,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [591816967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:19,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [328438916] [2021-11-25 19:58:19,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:19,321 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:19,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:19,321 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:19,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-25 19:58:19,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:19,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:58:19,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:19,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:20,506 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:20,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:22,671 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:22,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [328438916] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:22,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497088832] [2021-11-25 19:58:22,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:22,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:22,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:22,672 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:22,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 19:58:22,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:22,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:58:22,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:22,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:24,102 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:58:24,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:27,789 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:58:27,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497088832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:27,790 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:58:27,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 12, 11, 8, 9] total 47 [2021-11-25 19:58:27,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699834566] [2021-11-25 19:58:27,790 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:27,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:58:27,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:27,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:58:27,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=1958, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 19:58:27,792 INFO L87 Difference]: Start difference. First operand 143 states and 168 transitions. Second operand has 48 states, 47 states have (on average 3.297872340425532) internal successors, (155), 48 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:46,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:46,736 INFO L93 Difference]: Finished difference Result 278 states and 323 transitions. [2021-11-25 19:58:46,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 19:58:46,738 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 3.297872340425532) internal successors, (155), 48 states have internal predecessors, (155), 0 states have call successors, (0), 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 33 [2021-11-25 19:58:46,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:46,740 INFO L225 Difference]: With dead ends: 278 [2021-11-25 19:58:46,740 INFO L226 Difference]: Without dead ends: 278 [2021-11-25 19:58:46,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 151 SyntacticMatches, 11 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2496 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=1125, Invalid=6707, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 19:58:46,744 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 690 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 690 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 1209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 356 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:46,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [690 Valid, 423 Invalid, 1209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 743 Invalid, 0 Unknown, 356 Unchecked, 4.0s Time] [2021-11-25 19:58:46,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2021-11-25 19:58:46,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 182. [2021-11-25 19:58:46,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 179 states have (on average 1.217877094972067) internal successors, (218), 181 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:46,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 218 transitions. [2021-11-25 19:58:46,751 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 218 transitions. Word has length 33 [2021-11-25 19:58:46,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:46,751 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 218 transitions. [2021-11-25 19:58:46,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 3.297872340425532) internal successors, (155), 48 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:46,752 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 218 transitions. [2021-11-25 19:58:46,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 19:58:46,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:46,753 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:58:46,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:46,972 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-25 19:58:47,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-25 19:58:47,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:47,366 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:58:47,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:47,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1154994598, now seen corresponding path program 1 times [2021-11-25 19:58:47,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:47,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1309311221] [2021-11-25 19:58:47,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:47,367 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:47,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:47,368 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:47,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 19:58:47,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:47,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:58:47,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:47,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:49,013 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:49,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:50,561 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:50,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:50,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1309311221] [2021-11-25 19:58:50,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1309311221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:50,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [369466273] [2021-11-25 19:58:50,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:50,562 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:50,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:50,563 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:50,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-25 19:58:50,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:50,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:58:50,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:51,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:52,692 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:58:52,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [369466273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:52,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098095006] [2021-11-25 19:58:52,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:58:52,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:58:52,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:58:52,693 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:58:52,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 19:58:52,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:58:52,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 19:58:52,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:52,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:53,179 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:53,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:53,754 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:58:53,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098095006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:53,754 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:58:53,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11, 10, 9, 8] total 33 [2021-11-25 19:58:53,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485361441] [2021-11-25 19:58:53,755 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:58:53,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 19:58:53,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:58:53,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 19:58:53,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 19:58:53,756 INFO L87 Difference]: Start difference. First operand 182 states and 218 transitions. Second operand has 33 states, 33 states have (on average 3.6363636363636362) internal successors, (120), 33 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:56,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:58:56,275 INFO L93 Difference]: Finished difference Result 195 states and 234 transitions. [2021-11-25 19:58:56,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 19:58:56,278 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.6363636363636362) internal successors, (120), 33 states have internal predecessors, (120), 0 states have call successors, (0), 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 33 [2021-11-25 19:58:56,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:58:56,279 INFO L225 Difference]: With dead ends: 195 [2021-11-25 19:58:56,279 INFO L226 Difference]: Without dead ends: 181 [2021-11-25 19:58:56,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=282, Invalid=1788, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:58:56,281 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 60 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:58:56,281 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 223 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 55 Invalid, 0 Unknown, 36 Unchecked, 0.3s Time] [2021-11-25 19:58:56,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-25 19:58:56,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 151. [2021-11-25 19:58:56,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 148 states have (on average 1.222972972972973) internal successors, (181), 150 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:56,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 181 transitions. [2021-11-25 19:58:56,286 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 181 transitions. Word has length 33 [2021-11-25 19:58:56,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:58:56,286 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 181 transitions. [2021-11-25 19:58:56,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.6363636363636362) internal successors, (120), 33 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:58:56,287 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 181 transitions. [2021-11-25 19:58:56,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 19:58:56,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:58:56,288 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2021-11-25 19:58:56,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-25 19:58:56,499 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-25 19:58:56,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 19:58:56,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:58:56,898 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:58:56,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:58:56,898 INFO L85 PathProgramCache]: Analyzing trace with hash -563143139, now seen corresponding path program 3 times [2021-11-25 19:58:56,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:58:56,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1524452116] [2021-11-25 19:58:56,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:58:56,899 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:58:56,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:58:56,900 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:58:56,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-25 19:58:57,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:58:57,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:58:57,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:58:57,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:58:57,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:58:57,690 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:57,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:58:59,895 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:58:59,896 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:58:59,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1524452116] [2021-11-25 19:58:59,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1524452116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:58:59,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1223089931] [2021-11-25 19:58:59,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:58:59,896 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:58:59,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:58:59,897 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:58:59,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-25 19:59:00,180 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:59:00,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:59:00,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:59:00,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:00,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:59:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:01,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:11,633 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:11,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1223089931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:59:11,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421205949] [2021-11-25 19:59:11,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:59:11,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:59:11,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:59:11,634 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:59:11,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 19:59:12,978 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:59:12,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:59:12,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:59:12,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:12,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 19:59:13,485 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:13,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:59:20,184 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:59:20,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421205949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:59:20,184 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:59:20,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15, 15, 14, 14] total 50 [2021-11-25 19:59:20,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71134968] [2021-11-25 19:59:20,185 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:59:20,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 19:59:20,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:59:20,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 19:59:20,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=698, Invalid=1852, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 19:59:20,187 INFO L87 Difference]: Start difference. First operand 151 states and 181 transitions. Second operand has 51 states, 50 states have (on average 2.86) internal successors, (143), 51 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:24,568 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:26,018 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:28,020 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:32,023 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:34,067 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:36,069 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:39,519 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:41,522 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:43,525 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:47,368 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:49,371 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:53,230 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 19:59:59,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:59:59,073 INFO L93 Difference]: Finished difference Result 1065 states and 1293 transitions. [2021-11-25 19:59:59,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:59:59,074 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 2.86) internal successors, (143), 51 states have internal predecessors, (143), 0 states have call successors, (0), 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 34 [2021-11-25 19:59:59,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:59:59,080 INFO L225 Difference]: With dead ends: 1065 [2021-11-25 19:59:59,080 INFO L226 Difference]: Without dead ends: 1065 [2021-11-25 19:59:59,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 150 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1951 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=1305, Invalid=3251, Unknown=0, NotChecked=0, Total=4556 [2021-11-25 19:59:59,082 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 1705 mSDsluCounter, 1017 mSDsCounter, 0 mSdLazyCounter, 1423 mSolverCounterSat, 61 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1705 SdHoareTripleChecker+Valid, 1073 SdHoareTripleChecker+Invalid, 1568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1423 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 27.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:59:59,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1705 Valid, 1073 Invalid, 1568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1423 Invalid, 7 Unknown, 77 Unchecked, 27.9s Time] [2021-11-25 19:59:59,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1065 states. [2021-11-25 19:59:59,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1065 to 183. [2021-11-25 19:59:59,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 180 states have (on average 1.2277777777777779) internal successors, (221), 182 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:59,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 221 transitions. [2021-11-25 19:59:59,093 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 221 transitions. Word has length 34 [2021-11-25 19:59:59,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:59:59,093 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 221 transitions. [2021-11-25 19:59:59,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 2.86) internal successors, (143), 51 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:59:59,094 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 221 transitions. [2021-11-25 19:59:59,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 19:59:59,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:59:59,095 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:59:59,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 19:59:59,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2021-11-25 19:59:59,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-25 19:59:59,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:59:59,710 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 19:59:59,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:59:59,711 INFO L85 PathProgramCache]: Analyzing trace with hash -249046629, now seen corresponding path program 2 times [2021-11-25 19:59:59,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:59:59,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [66695134] [2021-11-25 19:59:59,711 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:59:59,711 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:59:59,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:59:59,712 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:59:59,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-25 19:59:59,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 19:59:59,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:59:59,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:59:59,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:59:59,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:00,616 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:00:00,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:02,498 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:00:02,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:00:02,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [66695134] [2021-11-25 20:00:02,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [66695134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:02,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1399534841] [2021-11-25 20:00:02,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:02,499 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:02,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:00:02,500 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:00:02,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-25 20:00:02,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:02,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:02,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:00:02,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:03,672 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:00:03,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:05,457 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:00:05,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1399534841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:05,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522020722] [2021-11-25 20:00:05,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:05,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:05,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:00:05,458 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:00:05,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 20:00:05,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:05,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:05,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:00:05,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:06,386 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:06,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:07,443 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:07,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522020722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:07,444 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:00:07,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13, 12, 9, 7] total 49 [2021-11-25 20:00:07,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80143399] [2021-11-25 20:00:07,444 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:00:07,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-25 20:00:07,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:00:07,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-25 20:00:07,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=2127, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:00:07,446 INFO L87 Difference]: Start difference. First operand 183 states and 221 transitions. Second operand has 49 states, 49 states have (on average 3.1020408163265305) internal successors, (152), 49 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:22,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:00:22,241 INFO L93 Difference]: Finished difference Result 274 states and 337 transitions. [2021-11-25 20:00:22,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-25 20:00:22,241 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.1020408163265305) internal successors, (152), 49 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-25 20:00:22,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:00:22,242 INFO L225 Difference]: With dead ends: 274 [2021-11-25 20:00:22,242 INFO L226 Difference]: Without dead ends: 266 [2021-11-25 20:00:22,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2419 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=856, Invalid=8074, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 20:00:22,245 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 83 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:00:22,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 266 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 186 Invalid, 0 Unknown, 83 Unchecked, 0.9s Time] [2021-11-25 20:00:22,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-25 20:00:22,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 224. [2021-11-25 20:00:22,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 221 states have (on average 1.253393665158371) internal successors, (277), 223 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:22,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 277 transitions. [2021-11-25 20:00:22,252 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 277 transitions. Word has length 35 [2021-11-25 20:00:22,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:00:22,253 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 277 transitions. [2021-11-25 20:00:22,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.1020408163265305) internal successors, (152), 49 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:22,253 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 277 transitions. [2021-11-25 20:00:22,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 20:00:22,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:00:22,254 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:00:22,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-25 20:00:22,486 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-25 20:00:22,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2021-11-25 20:00:22,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:22,866 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:00:22,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:00:22,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1723241033, now seen corresponding path program 2 times [2021-11-25 20:00:22,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:00:22,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [965578646] [2021-11-25 20:00:22,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:22,867 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:00:22,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:00:22,868 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:00:22,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-25 20:00:23,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:23,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:23,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:00:23,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:23,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:23,711 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:23,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:26,548 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:26,549 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:00:26,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [965578646] [2021-11-25 20:00:26,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [965578646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:26,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1294613280] [2021-11-25 20:00:26,549 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:26,549 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:26,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:00:26,550 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:00:26,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-25 20:00:26,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:26,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:26,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:00:26,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:27,764 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:00:27,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:29,668 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:00:29,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1294613280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:29,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196660754] [2021-11-25 20:00:29,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:29,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:29,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:00:29,670 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:00:29,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 20:00:29,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:29,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:29,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:00:29,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:29,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:31,338 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:31,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:37,897 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:00:37,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196660754] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:37,897 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:00:37,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 12, 14, 14] total 63 [2021-11-25 20:00:37,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079805763] [2021-11-25 20:00:37,898 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:00:37,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 20:00:37,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:00:37,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 20:00:37,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=3523, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 20:00:37,901 INFO L87 Difference]: Start difference. First operand 224 states and 277 transitions. Second operand has 63 states, 63 states have (on average 2.9206349206349205) internal successors, (184), 63 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:47,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:00:47,936 INFO L93 Difference]: Finished difference Result 245 states and 299 transitions. [2021-11-25 20:00:47,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:00:47,938 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.9206349206349205) internal successors, (184), 63 states have internal predecessors, (184), 0 states have call successors, (0), 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 37 [2021-11-25 20:00:47,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:00:47,939 INFO L225 Difference]: With dead ends: 245 [2021-11-25 20:00:47,940 INFO L226 Difference]: Without dead ends: 245 [2021-11-25 20:00:47,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2040 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=663, Invalid=5499, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:00:47,941 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 176 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:00:47,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 399 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 432 Invalid, 0 Unknown, 67 Unchecked, 2.7s Time] [2021-11-25 20:00:47,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-25 20:00:47,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 217. [2021-11-25 20:00:47,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 214 states have (on average 1.2429906542056075) internal successors, (266), 216 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:47,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 266 transitions. [2021-11-25 20:00:47,948 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 266 transitions. Word has length 37 [2021-11-25 20:00:47,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:00:47,948 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 266 transitions. [2021-11-25 20:00:47,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.9206349206349205) internal successors, (184), 63 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:47,949 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 266 transitions. [2021-11-25 20:00:47,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:00:47,950 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:00:47,950 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:00:47,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-25 20:00:48,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Ended with exit code 0 [2021-11-25 20:00:48,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-25 20:00:48,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:48,574 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:00:48,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:00:48,575 INFO L85 PathProgramCache]: Analyzing trace with hash -710345958, now seen corresponding path program 2 times [2021-11-25 20:00:48,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:00:48,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1457982910] [2021-11-25 20:00:48,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:48,575 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:00:48,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:00:48,577 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:00:48,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-25 20:00:48,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:48,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:48,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:00:48,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:48,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:49,459 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:49,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:50,496 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:50,496 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:00:50,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1457982910] [2021-11-25 20:00:50,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1457982910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:50,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [516615629] [2021-11-25 20:00:50,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:50,496 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:50,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:00:50,497 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:00:50,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-25 20:00:50,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:50,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:50,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:00:50,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:51,454 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:00:51,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 3 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:00:52,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [516615629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:52,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867375131] [2021-11-25 20:00:52,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:00:52,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:52,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:00:52,856 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:00:52,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 20:00:52,958 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:00:52,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:00:52,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:00:52,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:52,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:53,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:54,188 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:00:54,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867375131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:54,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:00:54,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 13, 12, 8, 7] total 35 [2021-11-25 20:00:54,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16477711] [2021-11-25 20:00:54,189 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:00:54,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:00:54,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:00:54,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:00:54,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1051, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:00:54,191 INFO L87 Difference]: Start difference. First operand 217 states and 266 transitions. Second operand has 35 states, 35 states have (on average 3.342857142857143) internal successors, (117), 35 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:56,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:00:56,379 INFO L93 Difference]: Finished difference Result 240 states and 290 transitions. [2021-11-25 20:00:56,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:00:56,389 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.342857142857143) internal successors, (117), 35 states have internal predecessors, (117), 0 states have call successors, (0), 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 39 [2021-11-25 20:00:56,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:00:56,391 INFO L225 Difference]: With dead ends: 240 [2021-11-25 20:00:56,391 INFO L226 Difference]: Without dead ends: 236 [2021-11-25 20:00:56,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=319, Invalid=2231, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:00:56,393 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:00:56,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 272 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 38 Unchecked, 0.2s Time] [2021-11-25 20:00:56,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-25 20:00:56,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2021-11-25 20:00:56,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 223 states have (on average 1.2376681614349776) internal successors, (276), 225 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:56,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 276 transitions. [2021-11-25 20:00:56,411 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 276 transitions. Word has length 39 [2021-11-25 20:00:56,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:00:56,412 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 276 transitions. [2021-11-25 20:00:56,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.342857142857143) internal successors, (117), 35 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:00:56,412 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 276 transitions. [2021-11-25 20:00:56,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:00:56,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:00:56,413 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:00:56,416 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Ended with exit code 0 [2021-11-25 20:00:56,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Ended with exit code 0 [2021-11-25 20:00:56,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-25 20:00:57,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:00:57,016 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:00:57,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:00:57,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1573807329, now seen corresponding path program 1 times [2021-11-25 20:00:57,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:00:57,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [401181737] [2021-11-25 20:00:57,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:00:57,017 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:00:57,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:00:57,018 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:00:57,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-25 20:00:57,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:00:57,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:00:57,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:00:57,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:00:57,928 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:00:57,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:00:59,103 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:00:59,103 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:00:59,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [401181737] [2021-11-25 20:00:59,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [401181737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:00:59,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1099297788] [2021-11-25 20:00:59,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:00:59,104 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:00:59,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:00:59,105 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:00:59,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-25 20:00:59,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:00:59,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:00:59,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:00,103 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:01:00,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:01,766 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:01:01,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1099297788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:01,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939948586] [2021-11-25 20:01:01,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:01,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:01,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:01,768 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:01,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 20:01:01,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:01,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:01:01,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:01,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:01:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:01:02,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:02,935 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:01:02,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939948586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:02,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:01:02,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 13, 12, 8, 7] total 35 [2021-11-25 20:01:02,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52414377] [2021-11-25 20:01:02,936 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:02,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:01:02,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:01:02,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:01:02,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1040, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:01:02,937 INFO L87 Difference]: Start difference. First operand 226 states and 276 transitions. Second operand has 35 states, 35 states have (on average 3.6) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:08,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:08,053 INFO L93 Difference]: Finished difference Result 269 states and 322 transitions. [2021-11-25 20:01:08,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:01:08,054 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.6) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:01:08,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:08,055 INFO L225 Difference]: With dead ends: 269 [2021-11-25 20:01:08,056 INFO L226 Difference]: Without dead ends: 269 [2021-11-25 20:01:08,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 210 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1131 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=495, Invalid=3537, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:01:08,057 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 88 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:08,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 273 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 105 Invalid, 0 Unknown, 89 Unchecked, 0.5s Time] [2021-11-25 20:01:08,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-25 20:01:08,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 240. [2021-11-25 20:01:08,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 237 states have (on average 1.2236286919831223) internal successors, (290), 239 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:08,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 290 transitions. [2021-11-25 20:01:08,081 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 290 transitions. Word has length 40 [2021-11-25 20:01:08,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:08,081 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 290 transitions. [2021-11-25 20:01:08,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.6) internal successors, (126), 35 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:08,081 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 290 transitions. [2021-11-25 20:01:08,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:01:08,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:08,082 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:01:08,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-25 20:01:08,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Ended with exit code 0 [2021-11-25 20:01:08,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2021-11-25 20:01:08,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:01:08,683 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:01:08,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:08,683 INFO L85 PathProgramCache]: Analyzing trace with hash 1970005536, now seen corresponding path program 1 times [2021-11-25 20:01:08,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:01:08,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1224021367] [2021-11-25 20:01:08,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:08,684 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:01:08,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:01:08,685 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:01:08,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-25 20:01:08,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:08,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:01:08,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:08,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:01:09,532 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 13 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:09,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:12,573 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:12,573 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:01:12,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1224021367] [2021-11-25 20:01:12,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1224021367] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:12,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1345346540] [2021-11-25 20:01:12,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:12,574 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:01:12,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:01:12,575 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:01:12,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-25 20:01:12,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:12,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:01:12,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:13,973 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:01:13,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:15,931 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:01:15,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1345346540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:15,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515476055] [2021-11-25 20:01:15,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:01:15,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:15,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:15,933 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:15,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 20:01:16,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:01:16,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:01:16,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:16,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:01:17,608 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 13 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:17,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:25,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515476055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:25,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:01:25,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 14, 12, 13, 14] total 63 [2021-11-25 20:01:25,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547683226] [2021-11-25 20:01:25,178 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:01:25,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-25 20:01:25,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:01:25,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-25 20:01:25,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=3534, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 20:01:25,181 INFO L87 Difference]: Start difference. First operand 240 states and 290 transitions. Second operand has 63 states, 63 states have (on average 3.4444444444444446) internal successors, (217), 63 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:36,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:01:36,024 INFO L93 Difference]: Finished difference Result 297 states and 356 transitions. [2021-11-25 20:01:36,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 20:01:36,026 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.4444444444444446) internal successors, (217), 63 states have internal predecessors, (217), 0 states have call successors, (0), 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 43 [2021-11-25 20:01:36,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:01:36,028 INFO L225 Difference]: With dead ends: 297 [2021-11-25 20:01:36,028 INFO L226 Difference]: Without dead ends: 297 [2021-11-25 20:01:36,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2137 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=720, Invalid=6252, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 20:01:36,030 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 178 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:01:36,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 432 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 359 Invalid, 0 Unknown, 106 Unchecked, 2.0s Time] [2021-11-25 20:01:36,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-11-25 20:01:36,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 238. [2021-11-25 20:01:36,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 235 states have (on average 1.2170212765957447) internal successors, (286), 237 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:36,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 286 transitions. [2021-11-25 20:01:36,038 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 286 transitions. Word has length 43 [2021-11-25 20:01:36,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:01:36,038 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 286 transitions. [2021-11-25 20:01:36,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.4444444444444446) internal successors, (217), 63 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:01:36,039 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 286 transitions. [2021-11-25 20:01:36,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 20:01:36,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:01:36,040 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:01:36,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Ended with exit code 0 [2021-11-25 20:01:36,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-25 20:01:36,476 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-25 20:01:36,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:36,655 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:01:36,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:01:36,655 INFO L85 PathProgramCache]: Analyzing trace with hash 776299786, now seen corresponding path program 3 times [2021-11-25 20:01:36,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:01:36,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1083560175] [2021-11-25 20:01:36,656 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:01:36,656 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:01:36,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:01:36,657 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:01:36,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-25 20:01:36,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:01:36,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:01:36,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:01:36,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:36,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:01:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:37,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:41,920 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:41,920 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:01:41,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1083560175] [2021-11-25 20:01:41,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1083560175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:41,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1815500643] [2021-11-25 20:01:41,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:01:41,921 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:01:41,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:01:41,922 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:01:41,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-25 20:01:44,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:01:44,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:01:44,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:01:44,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:44,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:01:46,195 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 18 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:46,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:01:59,189 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:01:59,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1815500643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:01:59,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046108227] [2021-11-25 20:01:59,190 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:01:59,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:01:59,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:01:59,191 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:01:59,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 20:01:59,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:01:59,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:01:59,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:01:59,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:01:59,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:02:00,895 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:02:00,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:02:07,183 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:02:07,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046108227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:02:07,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:02:07,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 17, 17, 16] total 60 [2021-11-25 20:02:07,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011220294] [2021-11-25 20:02:07,183 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:02:07,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-25 20:02:07,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:02:07,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-25 20:02:07,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=3068, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 20:02:07,185 INFO L87 Difference]: Start difference. First operand 238 states and 286 transitions. Second operand has 60 states, 60 states have (on average 3.1) internal successors, (186), 60 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:02:30,816 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:02:45,246 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:02:47,282 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:02:53,238 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.55s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:02:55,221 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:03:26,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:26,363 INFO L93 Difference]: Finished difference Result 535 states and 658 transitions. [2021-11-25 20:03:26,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 20:03:26,365 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.1) internal successors, (186), 60 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 20:03:26,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:26,367 INFO L225 Difference]: With dead ends: 535 [2021-11-25 20:03:26,367 INFO L226 Difference]: Without dead ends: 531 [2021-11-25 20:03:26,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 221 SyntacticMatches, 24 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3553 ImplicationChecksByTransitivity, 78.3s TimeCoverageRelationStatistics Valid=1570, Invalid=7742, Unknown=0, NotChecked=0, Total=9312 [2021-11-25 20:03:26,368 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 663 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 103 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 663 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 1414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 516 IncrementalHoareTripleChecker+Unchecked, 17.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:26,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [663 Valid, 580 Invalid, 1414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 793 Invalid, 2 Unknown, 516 Unchecked, 17.9s Time] [2021-11-25 20:03:26,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-11-25 20:03:26,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 489. [2021-11-25 20:03:26,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 486 states have (on average 1.2633744855967077) internal successors, (614), 488 states have internal predecessors, (614), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:26,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 614 transitions. [2021-11-25 20:03:26,379 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 614 transitions. Word has length 46 [2021-11-25 20:03:26,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:26,379 INFO L470 AbstractCegarLoop]: Abstraction has 489 states and 614 transitions. [2021-11-25 20:03:26,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.1) internal successors, (186), 60 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:26,380 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 614 transitions. [2021-11-25 20:03:26,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 20:03:26,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:26,381 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:03:26,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-25 20:03:26,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-25 20:03:26,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-25 20:03:26,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:26,994 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:03:26,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:26,994 INFO L85 PathProgramCache]: Analyzing trace with hash 2126377186, now seen corresponding path program 1 times [2021-11-25 20:03:26,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:03:26,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [273723395] [2021-11-25 20:03:26,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:03:26,995 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:03:26,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:03:26,996 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:03:27,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-25 20:03:27,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:03:27,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:03:27,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:27,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:03:28,085 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 13 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:28,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:29,550 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:29,551 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:03:29,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [273723395] [2021-11-25 20:03:29,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [273723395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:29,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [835228246] [2021-11-25 20:03:29,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:03:29,551 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:03:29,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:03:29,553 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:03:29,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-25 20:03:29,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:03:29,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:03:29,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:30,543 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:03:30,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:31,958 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:03:31,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [835228246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:31,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842106868] [2021-11-25 20:03:31,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:03:31,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:31,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:03:31,959 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:03:31,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 20:03:32,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:03:32,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:03:32,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:32,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:03:32,651 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 13 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:32,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:35,301 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:35,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842106868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:35,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:03:35,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 13, 12, 10, 10] total 45 [2021-11-25 20:03:35,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135886084] [2021-11-25 20:03:35,301 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:03:35,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-25 20:03:35,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:03:35,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-25 20:03:35,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1751, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:03:35,303 INFO L87 Difference]: Start difference. First operand 489 states and 614 transitions. Second operand has 45 states, 45 states have (on average 3.933333333333333) internal successors, (177), 45 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:43,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:43,790 INFO L93 Difference]: Finished difference Result 797 states and 1000 transitions. [2021-11-25 20:03:43,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-25 20:03:43,791 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.933333333333333) internal successors, (177), 45 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 20:03:43,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:43,794 INFO L225 Difference]: With dead ends: 797 [2021-11-25 20:03:43,794 INFO L226 Difference]: Without dead ends: 785 [2021-11-25 20:03:43,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 257 SyntacticMatches, 11 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2400 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=907, Invalid=6233, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:03:43,796 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 106 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:43,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 353 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 105 Invalid, 0 Unknown, 39 Unchecked, 0.5s Time] [2021-11-25 20:03:43,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 785 states. [2021-11-25 20:03:43,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 785 to 576. [2021-11-25 20:03:43,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 576 states, 573 states have (on average 1.2617801047120418) internal successors, (723), 575 states have internal predecessors, (723), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:43,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 723 transitions. [2021-11-25 20:03:43,811 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 723 transitions. Word has length 46 [2021-11-25 20:03:43,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:43,811 INFO L470 AbstractCegarLoop]: Abstraction has 576 states and 723 transitions. [2021-11-25 20:03:43,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.933333333333333) internal successors, (177), 45 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:43,812 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 723 transitions. [2021-11-25 20:03:43,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 20:03:43,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:43,813 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:03:43,829 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 0 [2021-11-25 20:03:44,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-25 20:03:44,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-25 20:03:44,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:44,428 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:03:44,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:44,428 INFO L85 PathProgramCache]: Analyzing trace with hash -1655856976, now seen corresponding path program 2 times [2021-11-25 20:03:44,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:03:44,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1172498882] [2021-11-25 20:03:44,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:03:44,429 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:03:44,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:03:44,429 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:03:44,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-25 20:03:44,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:03:44,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:44,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:03:44,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:44,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:03:46,075 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 13 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:46,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:47,811 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:47,811 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:03:47,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1172498882] [2021-11-25 20:03:47,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1172498882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:47,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194401915] [2021-11-25 20:03:47,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:03:47,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:03:47,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:03:47,813 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:03:47,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-25 20:03:48,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:03:48,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:48,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:03:48,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:03:48,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:50,371 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:03:50,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194401915] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:50,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555082150] [2021-11-25 20:03:50,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:03:50,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:03:50,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:03:50,373 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:03:50,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-25 20:03:50,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:03:50,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:50,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:03:50,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:50,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:03:51,061 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 13 proven. 16 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:51,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:03:51,971 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:03:51,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555082150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:03:51,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:03:51,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13, 12, 9, 9] total 38 [2021-11-25 20:03:51,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554394124] [2021-11-25 20:03:51,972 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:03:51,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:03:51,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:03:51,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:03:51,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:03:51,973 INFO L87 Difference]: Start difference. First operand 576 states and 723 transitions. Second operand has 38 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 38 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:56,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:56,636 INFO L93 Difference]: Finished difference Result 913 states and 1148 transitions. [2021-11-25 20:03:56,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 20:03:56,637 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 38 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-25 20:03:56,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:56,642 INFO L225 Difference]: With dead ends: 913 [2021-11-25 20:03:56,642 INFO L226 Difference]: Without dead ends: 913 [2021-11-25 20:03:56,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 252 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1171 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=497, Invalid=3663, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:03:56,643 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 96 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:56,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 345 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 184 Invalid, 0 Unknown, 56 Unchecked, 0.8s Time] [2021-11-25 20:03:56,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 913 states. [2021-11-25 20:03:56,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 913 to 859. [2021-11-25 20:03:56,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 859 states, 856 states have (on average 1.2768691588785046) internal successors, (1093), 858 states have internal predecessors, (1093), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:56,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 859 states to 859 states and 1093 transitions. [2021-11-25 20:03:56,663 INFO L78 Accepts]: Start accepts. Automaton has 859 states and 1093 transitions. Word has length 46 [2021-11-25 20:03:56,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:56,663 INFO L470 AbstractCegarLoop]: Abstraction has 859 states and 1093 transitions. [2021-11-25 20:03:56,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 38 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:56,664 INFO L276 IsEmpty]: Start isEmpty. Operand 859 states and 1093 transitions. [2021-11-25 20:03:56,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 20:03:56,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:56,665 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:03:56,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Ended with exit code 0 [2021-11-25 20:03:56,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-25 20:03:57,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2021-11-25 20:03:57,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:03:57,269 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:03:57,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:57,269 INFO L85 PathProgramCache]: Analyzing trace with hash 524583167, now seen corresponding path program 3 times [2021-11-25 20:03:57,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:03:57,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [128247341] [2021-11-25 20:03:57,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:03:57,270 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:03:57,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:03:57,272 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:03:57,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-25 20:03:57,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:03:57,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:57,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:03:57,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:57,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:03:58,871 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-25 20:03:58,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:03:58,871 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:03:58,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [128247341] [2021-11-25 20:03:58,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [128247341] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:03:58,871 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:03:58,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:03:58,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466128294] [2021-11-25 20:03:58,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:03:58,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:03:58,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:03:58,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:03:58,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:03:58,872 INFO L87 Difference]: Start difference. First operand 859 states and 1093 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:59,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:03:59,016 INFO L93 Difference]: Finished difference Result 992 states and 1269 transitions. [2021-11-25 20:03:59,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:03:59,017 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 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 [2021-11-25 20:03:59,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:03:59,020 INFO L225 Difference]: With dead ends: 992 [2021-11-25 20:03:59,020 INFO L226 Difference]: Without dead ends: 992 [2021-11-25 20:03:59,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:03:59,021 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:03:59,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 68 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 35 Unchecked, 0.0s Time] [2021-11-25 20:03:59,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 992 states. [2021-11-25 20:03:59,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 992 to 965. [2021-11-25 20:03:59,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 965 states, 962 states have (on average 1.2869022869022868) internal successors, (1238), 964 states have internal predecessors, (1238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:59,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 965 states to 965 states and 1238 transitions. [2021-11-25 20:03:59,041 INFO L78 Accepts]: Start accepts. Automaton has 965 states and 1238 transitions. Word has length 48 [2021-11-25 20:03:59,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:03:59,042 INFO L470 AbstractCegarLoop]: Abstraction has 965 states and 1238 transitions. [2021-11-25 20:03:59,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:03:59,042 INFO L276 IsEmpty]: Start isEmpty. Operand 965 states and 1238 transitions. [2021-11-25 20:03:59,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:03:59,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:03:59,044 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:03:59,054 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (73)] Ended with exit code 0 [2021-11-25 20:03:59,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:03:59,254 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:03:59,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:03:59,254 INFO L85 PathProgramCache]: Analyzing trace with hash -557992115, now seen corresponding path program 4 times [2021-11-25 20:03:59,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:03:59,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1548243098] [2021-11-25 20:03:59,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:03:59,255 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:03:59,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:03:59,255 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:03:59,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-25 20:03:59,401 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:03:59,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:03:59,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:03:59,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:03:59,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:04:00,540 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:00,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:06,427 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 17 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:06,427 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:04:06,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1548243098] [2021-11-25 20:04:06,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1548243098] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:06,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1478896379] [2021-11-25 20:04:06,428 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:04:06,428 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:04:06,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:04:06,445 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:04:06,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-25 20:04:06,664 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:04:06,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:06,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:04:06,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:08,619 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 8 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:08,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:11,658 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 8 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:04:11,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1478896379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:11,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988178800] [2021-11-25 20:04:11,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:04:11,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:04:11,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:04:11,661 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:04:11,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-25 20:04:11,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:04:11,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:04:11,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:04:11,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:04:11,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:04:13,770 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:04:13,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:04:23,021 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:04:23,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988178800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:04:23,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:04:23,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 18, 16, 13, 13] total 80 [2021-11-25 20:04:23,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728788223] [2021-11-25 20:04:23,022 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:04:23,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-25 20:04:23,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:04:23,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-25 20:04:23,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=5612, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:04:23,024 INFO L87 Difference]: Start difference. First operand 965 states and 1238 transitions. Second operand has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:10,271 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:05:12,308 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:05:30,068 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:05:35,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:05:37,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:05:55,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:05:55,433 INFO L93 Difference]: Finished difference Result 2967 states and 3789 transitions. [2021-11-25 20:05:55,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-11-25 20:05:55,435 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 20:05:55,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:05:55,446 INFO L225 Difference]: With dead ends: 2967 [2021-11-25 20:05:55,446 INFO L226 Difference]: Without dead ends: 2967 [2021-11-25 20:05:55,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 215 SyntacticMatches, 2 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13956 ImplicationChecksByTransitivity, 71.1s TimeCoverageRelationStatistics Valid=6593, Invalid=37297, Unknown=0, NotChecked=0, Total=43890 [2021-11-25 20:05:55,448 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 3767 mSDsluCounter, 2047 mSDsCounter, 0 mSdLazyCounter, 5625 mSolverCounterSat, 562 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3767 SdHoareTripleChecker+Valid, 2104 SdHoareTripleChecker+Invalid, 6420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 562 IncrementalHoareTripleChecker+Valid, 5625 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 37.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:05:55,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3767 Valid, 2104 Invalid, 6420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [562 Valid, 5625 Invalid, 5 Unknown, 228 Unchecked, 37.2s Time] [2021-11-25 20:05:55,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2967 states. [2021-11-25 20:05:55,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2967 to 1500. [2021-11-25 20:05:55,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1500 states, 1497 states have (on average 1.2732130928523715) internal successors, (1906), 1499 states have internal predecessors, (1906), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:55,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1500 states to 1500 states and 1906 transitions. [2021-11-25 20:05:55,489 INFO L78 Accepts]: Start accepts. Automaton has 1500 states and 1906 transitions. Word has length 50 [2021-11-25 20:05:55,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:05:55,490 INFO L470 AbstractCegarLoop]: Abstraction has 1500 states and 1906 transitions. [2021-11-25 20:05:55,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:05:55,490 INFO L276 IsEmpty]: Start isEmpty. Operand 1500 states and 1906 transitions. [2021-11-25 20:05:55,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 20:05:55,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:05:55,492 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:05:55,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-25 20:05:55,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-25 20:05:55,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-25 20:05:56,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:05:56,126 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:05:56,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:05:56,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1181991283, now seen corresponding path program 3 times [2021-11-25 20:05:56,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:05:56,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [271961467] [2021-11-25 20:05:56,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:05:56,127 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:05:56,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:05:56,129 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:05:56,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-25 20:05:56,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:05:56,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:05:56,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:05:56,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:05:56,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:05:57,134 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:05:57,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:05:59,337 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:05:59,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:05:59,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [271961467] [2021-11-25 20:05:59,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [271961467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:05:59,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1394777923] [2021-11-25 20:05:59,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:05:59,338 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:05:59,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:05:59,338 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:05:59,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-25 20:05:59,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:05:59,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:05:59,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:05:59,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:05:59,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:00,300 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:06:00,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:06:03,250 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:06:03,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1394777923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:03,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900268047] [2021-11-25 20:06:03,251 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:06:03,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:06:03,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:06:03,256 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:06:03,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-25 20:06:03,366 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:06:03,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:03,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:06:03,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:03,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:04,063 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:06:04,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:06:06,390 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 20:06:06,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900268047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:06,391 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:06:06,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 7, 8, 7, 8] total 30 [2021-11-25 20:06:06,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534897351] [2021-11-25 20:06:06,391 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:06:06,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:06:06,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:06:06,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:06:06,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=763, Unknown=0, NotChecked=0, Total=930 [2021-11-25 20:06:06,392 INFO L87 Difference]: Start difference. First operand 1500 states and 1906 transitions. Second operand has 31 states, 30 states have (on average 4.533333333333333) internal successors, (136), 31 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:30,235 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:06:32,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:06:32,757 INFO L93 Difference]: Finished difference Result 2268 states and 2837 transitions. [2021-11-25 20:06:32,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-25 20:06:32,758 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.533333333333333) internal successors, (136), 31 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 20:06:32,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:06:32,765 INFO L225 Difference]: With dead ends: 2268 [2021-11-25 20:06:32,765 INFO L226 Difference]: Without dead ends: 2268 [2021-11-25 20:06:32,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1943 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=1214, Invalid=4948, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:06:32,766 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 501 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 501 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:06:32,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [501 Valid, 161 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 429 Invalid, 0 Unknown, 20 Unchecked, 7.9s Time] [2021-11-25 20:06:32,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2268 states. [2021-11-25 20:06:32,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2268 to 1160. [2021-11-25 20:06:32,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1160 states, 1157 states have (on average 1.2273120138288678) internal successors, (1420), 1159 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:32,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1420 transitions. [2021-11-25 20:06:32,804 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1420 transitions. Word has length 50 [2021-11-25 20:06:32,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:06:32,804 INFO L470 AbstractCegarLoop]: Abstraction has 1160 states and 1420 transitions. [2021-11-25 20:06:32,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.533333333333333) internal successors, (136), 31 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:32,805 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1420 transitions. [2021-11-25 20:06:32,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 20:06:32,806 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:06:32,806 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:06:32,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-25 20:06:33,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-25 20:06:33,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-25 20:06:33,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:06:33,434 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:06:33,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:06:33,435 INFO L85 PathProgramCache]: Analyzing trace with hash 1449783048, now seen corresponding path program 2 times [2021-11-25 20:06:33,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:06:33,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [356120582] [2021-11-25 20:06:33,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:06:33,435 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:06:33,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:06:33,436 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:06:33,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-25 20:06:33,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:06:33,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:33,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:06:33,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:33,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:34,797 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 27 proven. 37 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:06:34,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:06:36,695 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 54 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:06:36,695 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:06:36,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [356120582] [2021-11-25 20:06:36,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [356120582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:36,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [176714028] [2021-11-25 20:06:36,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:06:36,695 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:06:36,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:06:36,696 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:06:36,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-25 20:06:36,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:06:36,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:36,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:06:36,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:38,081 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 35 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:06:38,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:06:40,082 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 35 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:06:40,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [176714028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:40,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1424136210] [2021-11-25 20:06:40,082 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:06:40,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:06:40,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:06:40,083 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:06:40,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-25 20:06:40,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:06:40,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:40,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:06:40,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:40,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:42,139 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 16 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:06:42,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:06:44,449 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 8 proven. 36 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:06:44,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1424136210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:06:44,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:06:44,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 14, 13, 11, 10] total 57 [2021-11-25 20:06:44,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325058037] [2021-11-25 20:06:44,449 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:06:44,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-25 20:06:44,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:06:44,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-25 20:06:44,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=2866, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:06:44,459 INFO L87 Difference]: Start difference. First operand 1160 states and 1420 transitions. Second operand has 57 states, 57 states have (on average 4.228070175438597) internal successors, (241), 57 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:54,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:06:54,874 INFO L93 Difference]: Finished difference Result 1449 states and 1780 transitions. [2021-11-25 20:06:54,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 20:06:54,874 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 4.228070175438597) internal successors, (241), 57 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-25 20:06:54,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:06:54,879 INFO L225 Difference]: With dead ends: 1449 [2021-11-25 20:06:54,879 INFO L226 Difference]: Without dead ends: 1449 [2021-11-25 20:06:54,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 297 SyntacticMatches, 10 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2697 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=1019, Invalid=7723, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 20:06:54,880 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 118 mSDsluCounter, 495 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:06:54,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 517 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 0 Unknown, 54 Unchecked, 0.1s Time] [2021-11-25 20:06:54,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1449 states. [2021-11-25 20:06:54,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1449 to 1363. [2021-11-25 20:06:54,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1363 states, 1360 states have (on average 1.2338235294117648) internal successors, (1678), 1362 states have internal predecessors, (1678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:54,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1363 states to 1363 states and 1678 transitions. [2021-11-25 20:06:54,904 INFO L78 Accepts]: Start accepts. Automaton has 1363 states and 1678 transitions. Word has length 54 [2021-11-25 20:06:54,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:06:54,904 INFO L470 AbstractCegarLoop]: Abstraction has 1363 states and 1678 transitions. [2021-11-25 20:06:54,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 4.228070175438597) internal successors, (241), 57 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:54,905 INFO L276 IsEmpty]: Start isEmpty. Operand 1363 states and 1678 transitions. [2021-11-25 20:06:54,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 20:06:54,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:06:54,907 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:06:54,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-25 20:06:55,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (80)] Ended with exit code 0 [2021-11-25 20:06:55,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-25 20:06:55,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:06:55,522 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:06:55,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:06:55,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1125784214, now seen corresponding path program 3 times [2021-11-25 20:06:55,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:06:55,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [443488032] [2021-11-25 20:06:55,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:06:55,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:06:55,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:06:55,525 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:06:55,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-25 20:06:55,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:06:55,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:55,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:06:55,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:55,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:56,702 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:06:56,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:06:56,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:06:56,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [443488032] [2021-11-25 20:06:56,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [443488032] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:06:56,703 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:06:56,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:06:56,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728017875] [2021-11-25 20:06:56,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:06:56,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:06:56,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:06:56,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:06:56,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:06:56,704 INFO L87 Difference]: Start difference. First operand 1363 states and 1678 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:57,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:06:57,833 INFO L93 Difference]: Finished difference Result 1433 states and 1734 transitions. [2021-11-25 20:06:57,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:06:57,834 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 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 56 [2021-11-25 20:06:57,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:06:57,841 INFO L225 Difference]: With dead ends: 1433 [2021-11-25 20:06:57,841 INFO L226 Difference]: Without dead ends: 1433 [2021-11-25 20:06:57,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:06:57,842 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 3 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:06:57,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 55 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 27 Unchecked, 0.0s Time] [2021-11-25 20:06:57,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1433 states. [2021-11-25 20:06:57,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1433 to 799. [2021-11-25 20:06:57,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 799 states, 797 states have (on average 1.1593475533249686) internal successors, (924), 798 states have internal predecessors, (924), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:57,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 799 states to 799 states and 924 transitions. [2021-11-25 20:06:57,861 INFO L78 Accepts]: Start accepts. Automaton has 799 states and 924 transitions. Word has length 56 [2021-11-25 20:06:57,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:06:57,862 INFO L470 AbstractCegarLoop]: Abstraction has 799 states and 924 transitions. [2021-11-25 20:06:57,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:06:57,862 INFO L276 IsEmpty]: Start isEmpty. Operand 799 states and 924 transitions. [2021-11-25 20:06:57,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:06:57,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:06:57,864 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:06:57,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-25 20:06:58,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:06:58,075 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:06:58,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:06:58,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1063550536, now seen corresponding path program 3 times [2021-11-25 20:06:58,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:06:58,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [438708391] [2021-11-25 20:06:58,076 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:06:58,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:06:58,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:06:58,077 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:06:58,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-25 20:06:58,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:06:58,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:06:58,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:06:58,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:06:58,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:06:59,309 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:06:59,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:07:03,328 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:07:03,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [438708391] [2021-11-25 20:07:03,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [438708391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:03,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1725650006] [2021-11-25 20:07:03,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:03,328 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:07:03,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:07:03,329 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:07:03,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-25 20:07:05,162 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:07:05,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:05,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:07:05,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:05,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:07:06,255 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:07:06,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:15,478 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:07:15,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1725650006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:15,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87066936] [2021-11-25 20:07:15,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:15,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:15,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:15,499 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:15,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-25 20:07:15,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:07:15,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:15,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:07:15,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:15,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:07:16,818 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:07:16,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:25,196 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:07:25,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87066936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:25,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:07:25,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12, 13, 11, 13] total 45 [2021-11-25 20:07:25,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166851737] [2021-11-25 20:07:25,197 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:25,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:07:25,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:07:25,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:07:25,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1711, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:07:25,198 INFO L87 Difference]: Start difference. First operand 799 states and 924 transitions. Second operand has 46 states, 45 states have (on average 3.3333333333333335) internal successors, (150), 46 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) [2021-11-25 20:07:58,808 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:08:29,491 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:08:32,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:08:32,482 INFO L93 Difference]: Finished difference Result 1140 states and 1318 transitions. [2021-11-25 20:08:32,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 20:08:32,484 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 3.3333333333333335) internal successors, (150), 46 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 59 [2021-11-25 20:08:32,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:08:32,488 INFO L225 Difference]: With dead ends: 1140 [2021-11-25 20:08:32,488 INFO L226 Difference]: Without dead ends: 1134 [2021-11-25 20:08:32,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 306 SyntacticMatches, 10 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3517 ImplicationChecksByTransitivity, 60.7s TimeCoverageRelationStatistics Valid=2307, Invalid=8613, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 20:08:32,489 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1326 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 829 mSolverCounterSat, 227 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1326 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 1309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 829 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 252 IncrementalHoareTripleChecker+Unchecked, 19.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:08:32,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1326 Valid, 390 Invalid, 1309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 829 Invalid, 1 Unknown, 252 Unchecked, 19.2s Time] [2021-11-25 20:08:32,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2021-11-25 20:08:32,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 1007. [2021-11-25 20:08:32,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1007 states, 1005 states have (on average 1.1671641791044776) internal successors, (1173), 1006 states have internal predecessors, (1173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:08:32,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1007 states to 1007 states and 1173 transitions. [2021-11-25 20:08:32,503 INFO L78 Accepts]: Start accepts. Automaton has 1007 states and 1173 transitions. Word has length 59 [2021-11-25 20:08:32,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:08:32,503 INFO L470 AbstractCegarLoop]: Abstraction has 1007 states and 1173 transitions. [2021-11-25 20:08:32,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 3.3333333333333335) internal successors, (150), 46 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) [2021-11-25 20:08:32,504 INFO L276 IsEmpty]: Start isEmpty. Operand 1007 states and 1173 transitions. [2021-11-25 20:08:32,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 20:08:32,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:08:32,506 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:08:32,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (85)] Forceful destruction successful, exit code 0 [2021-11-25 20:08:32,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2021-11-25 20:08:32,918 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (84)] Ended with exit code 0 [2021-11-25 20:08:33,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:08:33,110 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:08:33,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:08:33,111 INFO L85 PathProgramCache]: Analyzing trace with hash 128096752, now seen corresponding path program 4 times [2021-11-25 20:08:33,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:08:33,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1977936467] [2021-11-25 20:08:33,111 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:08:33,111 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:08:33,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:08:33,112 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:08:33,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-25 20:08:33,297 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:08:33,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:08:33,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 20:08:33,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:08:33,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:08:34,249 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:08:34,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:08:37,311 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:08:37,311 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:08:37,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1977936467] [2021-11-25 20:08:37,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1977936467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:08:37,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [161114903] [2021-11-25 20:08:37,312 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:08:37,312 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:08:37,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:08:37,312 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:08:37,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-25 20:08:37,593 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:08:37,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:08:37,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:08:37,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:08:38,439 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:08:38,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:08:39,493 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 55 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:08:39,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [161114903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:08:39,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943065943] [2021-11-25 20:08:39,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:08:39,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:08:39,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:08:39,494 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:08:39,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-25 20:08:39,648 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:08:39,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:08:39,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:08:39,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:08:41,513 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 20:08:41,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:08:42,359 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:08:42,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943065943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:08:42,359 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:08:42,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 10, 15, 7] total 53 [2021-11-25 20:08:42,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833811811] [2021-11-25 20:08:42,360 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:08:42,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:08:42,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:08:42,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:08:42,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=2465, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:08:42,361 INFO L87 Difference]: Start difference. First operand 1007 states and 1173 transitions. Second operand has 53 states, 53 states have (on average 4.622641509433962) internal successors, (245), 53 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:09:16,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-25 20:09:27,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:27,343 INFO L93 Difference]: Finished difference Result 1736 states and 2022 transitions. [2021-11-25 20:09:27,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-25 20:09:27,345 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 4.622641509433962) internal successors, (245), 53 states have internal predecessors, (245), 0 states have call successors, (0), 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 62 [2021-11-25 20:09:27,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:27,350 INFO L225 Difference]: With dead ends: 1736 [2021-11-25 20:09:27,350 INFO L226 Difference]: Without dead ends: 1598 [2021-11-25 20:09:27,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 347 SyntacticMatches, 4 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8401 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=2815, Invalid=21365, Unknown=0, NotChecked=0, Total=24180 [2021-11-25 20:09:27,352 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 1325 mSDsluCounter, 952 mSDsCounter, 0 mSdLazyCounter, 2401 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1325 SdHoareTripleChecker+Valid, 995 SdHoareTripleChecker+Invalid, 2847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 2401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 196 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:27,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1325 Valid, 995 Invalid, 2847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 2401 Invalid, 0 Unknown, 196 Unchecked, 9.6s Time] [2021-11-25 20:09:27,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1598 states. [2021-11-25 20:09:27,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1598 to 1415. [2021-11-25 20:09:27,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1415 states, 1413 states have (on average 1.1889596602972399) internal successors, (1680), 1414 states have internal predecessors, (1680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:09:27,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1415 states to 1415 states and 1680 transitions. [2021-11-25 20:09:27,379 INFO L78 Accepts]: Start accepts. Automaton has 1415 states and 1680 transitions. Word has length 62 [2021-11-25 20:09:27,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:27,380 INFO L470 AbstractCegarLoop]: Abstraction has 1415 states and 1680 transitions. [2021-11-25 20:09:27,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 4.622641509433962) internal successors, (245), 53 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:09:27,380 INFO L276 IsEmpty]: Start isEmpty. Operand 1415 states and 1680 transitions. [2021-11-25 20:09:27,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 20:09:27,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:27,382 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2021-11-25 20:09:27,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (88)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:27,608 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2021-11-25 20:09:27,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-25 20:09:27,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:09:27,987 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 11 more)] === [2021-11-25 20:09:27,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:27,988 INFO L85 PathProgramCache]: Analyzing trace with hash 58542645, now seen corresponding path program 4 times [2021-11-25 20:09:27,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:09:27,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [594813658] [2021-11-25 20:09:27,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:09:27,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:09:27,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:09:27,989 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:09:27,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-25 20:09:28,176 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:09:28,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:09:28,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:09:28,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:28,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:09:29,813 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:09:29,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:40,861 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:09:40,862 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:09:40,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [594813658] [2021-11-25 20:09:40,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [594813658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:09:40,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [972600483] [2021-11-25 20:09:40,862 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:09:40,862 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:09:40,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:09:40,863 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:09:40,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-25 20:09:41,200 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:09:41,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:09:41,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:09:41,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:41,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:09:42,493 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:09:42,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:52,945 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:09:52,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [972600483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:09:52,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437632050] [2021-11-25 20:09:52,945 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:09:52,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:52,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:52,946 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:52,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5812c32-7db7-402d-99c0-2a9409059218/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-25 20:09:53,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:09:53,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:09:53,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:09:53,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:53,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-25 20:09:55,527 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:09:55,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:10:17,573 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:10:17,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437632050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:10:17,573 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:10:17,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 19, 19, 26, 26] total 105 [2021-11-25 20:10:17,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828170665] [2021-11-25 20:10:17,574 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:10:17,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-25 20:10:17,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:10:17,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-25 20:10:17,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2920, Invalid=8210, Unknown=0, NotChecked=0, Total=11130 [2021-11-25 20:10:17,576 INFO L87 Difference]: Start difference. First operand 1415 states and 1680 transitions. Second operand has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:10:30,856 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers []