./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/verifythis/tree_del_rec.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_del_rec.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/svcomp-MemCleanup-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-12-07 00:51:08,594 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-07 00:51:08,596 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-07 00:51:08,628 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-07 00:51:08,628 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-07 00:51:08,630 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-07 00:51:08,631 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-07 00:51:08,634 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-07 00:51:08,636 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-07 00:51:08,637 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-07 00:51:08,638 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-07 00:51:08,639 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-07 00:51:08,640 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-07 00:51:08,641 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-07 00:51:08,643 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-07 00:51:08,644 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-07 00:51:08,645 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-07 00:51:08,646 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-07 00:51:08,648 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-07 00:51:08,651 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-07 00:51:08,653 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-07 00:51:08,654 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-07 00:51:08,656 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-07 00:51:08,657 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-07 00:51:08,660 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-07 00:51:08,661 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-07 00:51:08,661 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-07 00:51:08,662 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-07 00:51:08,663 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-07 00:51:08,663 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-07 00:51:08,664 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-07 00:51:08,664 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-07 00:51:08,665 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-07 00:51:08,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-07 00:51:08,667 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-07 00:51:08,667 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-07 00:51:08,667 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-07 00:51:08,667 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-07 00:51:08,667 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-07 00:51:08,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-07 00:51:08,668 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-07 00:51:08,669 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-07 00:51:08,689 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-07 00:51:08,689 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-07 00:51:08,689 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-07 00:51:08,689 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-07 00:51:08,690 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-07 00:51:08,690 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-07 00:51:08,690 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-07 00:51:08,690 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-07 00:51:08,691 INFO L138 SettingsManager]: * Use SBE=true [2021-12-07 00:51:08,691 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-07 00:51:08,691 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-07 00:51:08,691 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-07 00:51:08,691 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-07 00:51:08,698 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-07 00:51:08,698 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-07 00:51:08,698 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-07 00:51:08,698 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-07 00:51:08,698 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-07 00:51:08,699 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-07 00:51:08,699 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-07 00:51:08,699 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-07 00:51:08,700 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-07 00:51:08,700 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-07 00:51:08,700 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-07 00:51:08,700 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-07 00:51:08,865 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-07 00:51:08,880 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-07 00:51:08,882 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-07 00:51:08,883 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-07 00:51:08,883 INFO L275 PluginConnector]: CDTParser initialized [2021-12-07 00:51:08,884 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-07 00:51:08,929 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/ff0ae742c/eb3a068172784885bf140d3319288885/FLAG507ea7974 [2021-12-07 00:51:09,317 INFO L306 CDTParser]: Found 1 translation units. [2021-12-07 00:51:09,318 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-07 00:51:09,323 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/ff0ae742c/eb3a068172784885bf140d3319288885/FLAG507ea7974 [2021-12-07 00:51:09,332 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/ff0ae742c/eb3a068172784885bf140d3319288885 [2021-12-07 00:51:09,334 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-07 00:51:09,335 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-07 00:51:09,336 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-07 00:51:09,336 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-07 00:51:09,339 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-07 00:51:09,339 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:51:09" (1/1) ... [2021-12-07 00:51:09,340 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dcc132b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:09, skipping insertion in model container [2021-12-07 00:51:09,340 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:51:09" (1/1) ... [2021-12-07 00:51:09,345 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-07 00:51:09,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-07 00:51:09,456 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-07 00:51:09,470 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:09,472 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:09,485 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:51:09,498 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) [2021-12-07 00:51:09,499 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@406fd5ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:09, skipping insertion in model container [2021-12-07 00:51:09,499 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-07 00:51:09,499 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-07 00:51:09,501 INFO L158 Benchmark]: Toolchain (without parser) took 165.21ms. Allocated memory is still 88.1MB. Free memory was 62.9MB in the beginning and 53.3MB in the end (delta: 9.6MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-07 00:51:09,501 INFO L158 Benchmark]: CDTParser took 0.12ms. Allocated memory is still 88.1MB. Free memory is still 59.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-07 00:51:09,502 INFO L158 Benchmark]: CACSL2BoogieTranslator took 163.21ms. Allocated memory is still 88.1MB. Free memory was 62.7MB in the beginning and 53.3MB in the end (delta: 9.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-12-07 00:51:09,504 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12ms. Allocated memory is still 88.1MB. Free memory is still 59.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 163.21ms. Allocated memory is still 88.1MB. Free memory was 62.7MB in the beginning and 53.3MB in the end (delta: 9.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 28]: 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_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_del_rec.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-12-07 00:51:10,940 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-07 00:51:10,942 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-07 00:51:10,963 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-07 00:51:10,963 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-07 00:51:10,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-07 00:51:10,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-07 00:51:10,967 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-07 00:51:10,969 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-07 00:51:10,970 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-07 00:51:10,970 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-07 00:51:10,971 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-07 00:51:10,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-07 00:51:10,973 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-07 00:51:10,974 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-07 00:51:10,975 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-07 00:51:10,976 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-07 00:51:10,976 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-07 00:51:10,983 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-07 00:51:10,985 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-07 00:51:10,987 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-07 00:51:10,988 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-07 00:51:10,989 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-07 00:51:10,990 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-07 00:51:10,992 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-07 00:51:10,993 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-07 00:51:10,993 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-07 00:51:10,994 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-07 00:51:10,994 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-07 00:51:10,995 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-07 00:51:10,995 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-07 00:51:10,996 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-07 00:51:10,997 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-07 00:51:10,997 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-07 00:51:10,998 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-07 00:51:10,998 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-07 00:51:10,999 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-07 00:51:10,999 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-07 00:51:10,999 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-07 00:51:11,000 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-07 00:51:11,000 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-07 00:51:11,001 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-07 00:51:11,024 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-07 00:51:11,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-07 00:51:11,025 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-07 00:51:11,025 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-07 00:51:11,026 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-07 00:51:11,026 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-07 00:51:11,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-07 00:51:11,027 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-07 00:51:11,027 INFO L138 SettingsManager]: * Use SBE=true [2021-12-07 00:51:11,027 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-07 00:51:11,027 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-07 00:51:11,028 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-07 00:51:11,028 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-07 00:51:11,028 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-07 00:51:11,028 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-07 00:51:11,028 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-07 00:51:11,029 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-07 00:51:11,030 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-07 00:51:11,030 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-07 00:51:11,030 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-07 00:51:11,030 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-07 00:51:11,030 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-07 00:51:11,030 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-07 00:51:11,030 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-07 00:51:11,031 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-07 00:51:11,031 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-07 00:51:11,031 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-07 00:51:11,031 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_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-07 00:51:11,264 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-07 00:51:11,279 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-07 00:51:11,281 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-07 00:51:11,281 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-07 00:51:11,282 INFO L275 PluginConnector]: CDTParser initialized [2021-12-07 00:51:11,283 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-07 00:51:11,328 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/2da9cf0f9/9eee4fc06d9f46c8b7b963e960ec5371/FLAGa72e1cc9f [2021-12-07 00:51:11,710 INFO L306 CDTParser]: Found 1 translation units. [2021-12-07 00:51:11,710 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-07 00:51:11,716 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/2da9cf0f9/9eee4fc06d9f46c8b7b963e960ec5371/FLAGa72e1cc9f [2021-12-07 00:51:11,726 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/data/2da9cf0f9/9eee4fc06d9f46c8b7b963e960ec5371 [2021-12-07 00:51:11,728 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-07 00:51:11,729 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-07 00:51:11,730 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-07 00:51:11,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-07 00:51:11,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-07 00:51:11,734 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:11,735 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6970955e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11, skipping insertion in model container [2021-12-07 00:51:11,736 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:11,742 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-07 00:51:11,761 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-07 00:51:11,868 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-07 00:51:11,879 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,881 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,898 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:51:11,916 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-07 00:51:11,922 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-07 00:51:11,926 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-07 00:51:11,932 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,934 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,944 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:51:11,951 INFO L203 MainTranslator]: Completed pre-run [2021-12-07 00:51:11,960 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-07 00:51:11,964 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,965 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-07 00:51:11,973 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-07 00:51:11,986 INFO L208 MainTranslator]: Completed translation [2021-12-07 00:51:11,987 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11 WrapperNode [2021-12-07 00:51:11,987 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-07 00:51:11,988 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-07 00:51:11,988 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-07 00:51:11,988 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-07 00:51:11,993 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,002 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,020 INFO L137 Inliner]: procedures = 31, calls = 61, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 75 [2021-12-07 00:51:12,020 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-07 00:51:12,021 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-07 00:51:12,021 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-07 00:51:12,021 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-07 00:51:12,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,032 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,032 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,047 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,052 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,054 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,058 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-07 00:51:12,059 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-07 00:51:12,060 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-07 00:51:12,060 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-07 00:51:12,060 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (1/1) ... [2021-12-07 00:51:12,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-07 00:51:12,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:51:12,089 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-07 00:51:12,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2021-12-07 00:51:12,122 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2021-12-07 00:51:12,122 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-12-07 00:51:12,123 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-12-07 00:51:12,123 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-07 00:51:12,123 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-12-07 00:51:12,123 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-12-07 00:51:12,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-07 00:51:12,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-07 00:51:12,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-07 00:51:12,124 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-07 00:51:12,124 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-12-07 00:51:12,124 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-12-07 00:51:12,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-07 00:51:12,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-07 00:51:12,200 INFO L236 CfgBuilder]: Building ICFG [2021-12-07 00:51:12,202 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-07 00:51:12,695 INFO L277 CfgBuilder]: Performing block encoding [2021-12-07 00:51:12,701 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-07 00:51:12,701 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-07 00:51:12,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:51:12 BoogieIcfgContainer [2021-12-07 00:51:12,703 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-07 00:51:12,704 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-07 00:51:12,704 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-07 00:51:12,707 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-07 00:51:12,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 12:51:11" (1/3) ... [2021-12-07 00:51:12,707 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa3f01b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:51:12, skipping insertion in model container [2021-12-07 00:51:12,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:51:11" (2/3) ... [2021-12-07 00:51:12,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fa3f01b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:51:12, skipping insertion in model container [2021-12-07 00:51:12,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:51:12" (3/3) ... [2021-12-07 00:51:12,709 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2021-12-07 00:51:12,713 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-07 00:51:12,713 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 55 error locations. [2021-12-07 00:51:12,744 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-07 00:51:12,749 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 [2021-12-07 00:51:12,749 INFO L340 AbstractCegarLoop]: Starting to check reachability of 55 error locations. [2021-12-07 00:51:12,763 INFO L276 IsEmpty]: Start isEmpty. Operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-07 00:51:12,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-07 00:51:12,768 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:12,769 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-07 00:51:12,769 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:12,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:12,773 INFO L85 PathProgramCache]: Analyzing trace with hash 120433579, now seen corresponding path program 1 times [2021-12-07 00:51:12,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:12,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1502840336] [2021-12-07 00:51:12,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:12,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:12,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:12,783 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:12,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-07 00:51:12,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:12,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-07 00:51:12,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:12,911 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 6 treesize of output 5 [2021-12-07 00:51:12,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:12,918 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:12,919 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:12,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1502840336] [2021-12-07 00:51:12,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1502840336] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:12,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:12,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-07 00:51:12,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419609285] [2021-12-07 00:51:12,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:12,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-07 00:51:12,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:12,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-07 00:51:12,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:51:12,945 INFO L87 Difference]: Start difference. First operand has 174 states, 89 states have (on average 1.7640449438202248) internal successors, (157), 144 states have internal predecessors, (157), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:51:13,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:13,155 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2021-12-07 00:51:13,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-07 00:51:13,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-07 00:51:13,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:13,164 INFO L225 Difference]: With dead ends: 175 [2021-12-07 00:51:13,168 INFO L226 Difference]: Without dead ends: 172 [2021-12-07 00:51:13,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:51:13,172 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 6 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:13,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 326 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:51:13,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-12-07 00:51:13,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2021-12-07 00:51:13,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 87 states have (on average 1.7011494252873562) internal successors, (148), 140 states have internal predecessors, (148), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-07 00:51:13,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 192 transitions. [2021-12-07 00:51:13,210 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 192 transitions. Word has length 5 [2021-12-07 00:51:13,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:13,210 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 192 transitions. [2021-12-07 00:51:13,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:51:13,211 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 192 transitions. [2021-12-07 00:51:13,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-07 00:51:13,211 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:13,211 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-07 00:51:13,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-07 00:51:13,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:13,414 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:13,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:13,416 INFO L85 PathProgramCache]: Analyzing trace with hash 120433580, now seen corresponding path program 1 times [2021-12-07 00:51:13,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:13,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [310622] [2021-12-07 00:51:13,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:13,419 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:13,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:13,422 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:13,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-07 00:51:13,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:13,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-07 00:51:13,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:13,584 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 [2021-12-07 00:51:13,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:13,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:13,602 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:13,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [310622] [2021-12-07 00:51:13,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [310622] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:13,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:13,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-07 00:51:13,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123653417] [2021-12-07 00:51:13,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:13,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-07 00:51:13,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:13,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-07 00:51:13,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:51:13,606 INFO L87 Difference]: Start difference. First operand 170 states and 192 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:51:13,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:13,840 INFO L93 Difference]: Finished difference Result 169 states and 191 transitions. [2021-12-07 00:51:13,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-07 00:51:13,841 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-07 00:51:13,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:13,843 INFO L225 Difference]: With dead ends: 169 [2021-12-07 00:51:13,843 INFO L226 Difference]: Without dead ends: 169 [2021-12-07 00:51:13,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-07 00:51:13,844 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 2 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:13,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 327 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:51:13,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-12-07 00:51:13,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-12-07 00:51:13,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 87 states have (on average 1.6896551724137931) internal successors, (147), 139 states have internal predecessors, (147), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-07 00:51:13,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2021-12-07 00:51:13,860 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 5 [2021-12-07 00:51:13,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:13,861 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2021-12-07 00:51:13,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-07 00:51:13,861 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2021-12-07 00:51:13,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-07 00:51:13,862 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:13,862 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:13,869 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-12-07 00:51:14,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:14,064 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:14,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:14,066 INFO L85 PathProgramCache]: Analyzing trace with hash 854953177, now seen corresponding path program 1 times [2021-12-07 00:51:14,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:14,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2014588991] [2021-12-07 00:51:14,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:14,069 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:14,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:14,071 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:14,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-07 00:51:14,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:14,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-07 00:51:14,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:14,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:14,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:14,225 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:14,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2014588991] [2021-12-07 00:51:14,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2014588991] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:14,226 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:14,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-07 00:51:14,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757746030] [2021-12-07 00:51:14,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:14,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-07 00:51:14,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:14,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-07 00:51:14,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-07 00:51:14,227 INFO L87 Difference]: Start difference. First operand 169 states and 191 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:14,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:14,333 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2021-12-07 00:51:14,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:51:14,334 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-07 00:51:14,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:14,336 INFO L225 Difference]: With dead ends: 233 [2021-12-07 00:51:14,336 INFO L226 Difference]: Without dead ends: 233 [2021-12-07 00:51:14,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-07 00:51:14,337 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 91 mSDsluCounter, 957 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:14,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 1156 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-07 00:51:14,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-12-07 00:51:14,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 177. [2021-12-07 00:51:14,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 145 states have internal predecessors, (152), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 23 states have call predecessors, (26), 23 states have call successors, (26) [2021-12-07 00:51:14,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 201 transitions. [2021-12-07 00:51:14,349 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 201 transitions. Word has length 11 [2021-12-07 00:51:14,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:14,350 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 201 transitions. [2021-12-07 00:51:14,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:14,350 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 201 transitions. [2021-12-07 00:51:14,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-07 00:51:14,350 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:14,350 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:14,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-12-07 00:51:14,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:14,552 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:14,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:14,554 INFO L85 PathProgramCache]: Analyzing trace with hash 873486780, now seen corresponding path program 1 times [2021-12-07 00:51:14,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:14,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1387444555] [2021-12-07 00:51:14,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:14,556 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:14,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:14,559 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:14,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-07 00:51:14,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:14,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-07 00:51:14,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:14,729 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 [2021-12-07 00:51:14,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:14,758 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:14,758 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:14,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1387444555] [2021-12-07 00:51:14,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1387444555] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:14,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:14,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-07 00:51:14,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196913104] [2021-12-07 00:51:14,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:14,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:51:14,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:14,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:51:14,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:51:14,760 INFO L87 Difference]: Start difference. First operand 177 states and 201 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:15,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:15,100 INFO L93 Difference]: Finished difference Result 181 states and 205 transitions. [2021-12-07 00:51:15,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:51:15,100 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-07 00:51:15,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:15,102 INFO L225 Difference]: With dead ends: 181 [2021-12-07 00:51:15,102 INFO L226 Difference]: Without dead ends: 181 [2021-12-07 00:51:15,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:51:15,103 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 89 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:15,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 247 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-07 00:51:15,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-12-07 00:51:15,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2021-12-07 00:51:15,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 145 states have internal predecessors, (156), 23 states have call successors, (23), 8 states have call predecessors, (23), 9 states have return successors, (26), 25 states have call predecessors, (26), 23 states have call successors, (26) [2021-12-07 00:51:15,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-12-07 00:51:15,116 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 11 [2021-12-07 00:51:15,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:15,116 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-12-07 00:51:15,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:15,117 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-12-07 00:51:15,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-07 00:51:15,117 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:15,118 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:15,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-12-07 00:51:15,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:15,319 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:15,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:15,321 INFO L85 PathProgramCache]: Analyzing trace with hash 873486781, now seen corresponding path program 1 times [2021-12-07 00:51:15,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:15,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [705243930] [2021-12-07 00:51:15,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:15,323 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:15,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:15,325 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:15,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-07 00:51:15,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:15,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-07 00:51:15,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:15,427 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 [2021-12-07 00:51:15,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:15,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:15,458 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:15,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [705243930] [2021-12-07 00:51:15,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [705243930] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:15,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:15,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-07 00:51:15,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834215314] [2021-12-07 00:51:15,458 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:15,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-07 00:51:15,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:15,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-07 00:51:15,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:51:15,459 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:15,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:15,907 INFO L93 Difference]: Finished difference Result 185 states and 215 transitions. [2021-12-07 00:51:15,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-07 00:51:15,907 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-12-07 00:51:15,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:15,909 INFO L225 Difference]: With dead ends: 185 [2021-12-07 00:51:15,909 INFO L226 Difference]: Without dead ends: 185 [2021-12-07 00:51:15,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-07 00:51:15,910 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 93 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:15,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 242 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-07 00:51:15,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-07 00:51:15,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 182. [2021-12-07 00:51:15,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 96 states have (on average 1.6354166666666667) internal successors, (157), 147 states have internal predecessors, (157), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (28), 26 states have call predecessors, (28), 24 states have call successors, (28) [2021-12-07 00:51:15,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 209 transitions. [2021-12-07 00:51:15,918 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 209 transitions. Word has length 11 [2021-12-07 00:51:15,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:15,918 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 209 transitions. [2021-12-07 00:51:15,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-07 00:51:15,918 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 209 transitions. [2021-12-07 00:51:15,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-07 00:51:15,919 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:15,919 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:15,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-12-07 00:51:16,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:16,121 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:16,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:16,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1280810199, now seen corresponding path program 1 times [2021-12-07 00:51:16,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:16,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1616072785] [2021-12-07 00:51:16,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:16,124 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:16,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:16,125 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:16,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-07 00:51:16,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:16,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-07 00:51:16,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:16,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:16,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:16,247 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:16,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1616072785] [2021-12-07 00:51:16,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1616072785] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:16,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:16,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-07 00:51:16,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186254959] [2021-12-07 00:51:16,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:16,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-07 00:51:16,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:16,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-07 00:51:16,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-07 00:51:16,248 INFO L87 Difference]: Start difference. First operand 182 states and 209 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:51:16,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:16,332 INFO L93 Difference]: Finished difference Result 242 states and 282 transitions. [2021-12-07 00:51:16,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:51:16,332 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-12-07 00:51:16,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:16,334 INFO L225 Difference]: With dead ends: 242 [2021-12-07 00:51:16,334 INFO L226 Difference]: Without dead ends: 242 [2021-12-07 00:51:16,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-07 00:51:16,335 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 90 mSDsluCounter, 956 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 1154 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:16,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 1154 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-07 00:51:16,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-12-07 00:51:16,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 204. [2021-12-07 00:51:16,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 110 states have (on average 1.5909090909090908) internal successors, (175), 161 states have internal predecessors, (175), 31 states have call successors, (31), 9 states have call predecessors, (31), 10 states have return successors, (35), 33 states have call predecessors, (35), 31 states have call successors, (35) [2021-12-07 00:51:16,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 241 transitions. [2021-12-07 00:51:16,348 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 241 transitions. Word has length 17 [2021-12-07 00:51:16,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:16,348 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 241 transitions. [2021-12-07 00:51:16,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-07 00:51:16,348 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 241 transitions. [2021-12-07 00:51:16,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-07 00:51:16,349 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:16,349 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:16,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-12-07 00:51:16,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:16,551 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:16,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:16,553 INFO L85 PathProgramCache]: Analyzing trace with hash -1539264760, now seen corresponding path program 1 times [2021-12-07 00:51:16,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:16,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1853007980] [2021-12-07 00:51:16,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:16,555 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:16,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:16,558 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:16,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-07 00:51:16,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:16,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-07 00:51:16,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:16,755 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 [2021-12-07 00:51:16,924 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-07 00:51:16,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 33 [2021-12-07 00:51:16,937 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-07 00:51:16,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:17,115 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:17,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1853007980] [2021-12-07 00:51:17,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1853007980] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:51:17,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1567343962] [2021-12-07 00:51:17,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:17,115 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:51:17,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:51:17,116 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:51:17,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-07 00:51:17,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:17,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-07 00:51:17,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:17,280 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 [2021-12-07 00:51:19,417 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-07 00:51:19,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 21 [2021-12-07 00:51:19,425 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-07 00:51:19,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:19,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1567343962] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:51:19,543 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:51:19,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-07 00:51:19,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431374939] [2021-12-07 00:51:19,543 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:51:19,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-07 00:51:19,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:19,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-07 00:51:19,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-07 00:51:19,544 INFO L87 Difference]: Start difference. First operand 204 states and 241 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:51:25,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:25,918 INFO L93 Difference]: Finished difference Result 210 states and 249 transitions. [2021-12-07 00:51:25,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-07 00:51:25,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-12-07 00:51:25,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:25,920 INFO L225 Difference]: With dead ends: 210 [2021-12-07 00:51:25,920 INFO L226 Difference]: Without dead ends: 210 [2021-12-07 00:51:25,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 11 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-07 00:51:25,920 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 86 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 291 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:25,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 358 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 203 Invalid, 0 Unknown, 291 Unchecked, 0.3s Time] [2021-12-07 00:51:25,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-07 00:51:25,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2021-12-07 00:51:25,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 113 states have (on average 1.584070796460177) internal successors, (179), 164 states have internal predecessors, (179), 31 states have call successors, (31), 9 states have call predecessors, (31), 11 states have return successors, (39), 34 states have call predecessors, (39), 31 states have call successors, (39) [2021-12-07 00:51:25,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 249 transitions. [2021-12-07 00:51:25,928 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 249 transitions. Word has length 29 [2021-12-07 00:51:25,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:25,928 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 249 transitions. [2021-12-07 00:51:25,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 6 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:51:25,929 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 249 transitions. [2021-12-07 00:51:25,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-07 00:51:25,929 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:25,929 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:25,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-12-07 00:51:26,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-12-07 00:51:26,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 00:51:26,331 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:26,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:26,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1070284721, now seen corresponding path program 1 times [2021-12-07 00:51:26,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:26,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1318844529] [2021-12-07 00:51:26,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:26,332 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:26,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:26,332 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:26,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-07 00:51:26,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:26,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-07 00:51:26,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:26,443 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 [2021-12-07 00:51:26,447 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 [2021-12-07 00:51:32,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:51:32,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:51:32,657 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:51:32,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-12-07 00:51:32,676 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:32,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:32,908 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:32,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1318844529] [2021-12-07 00:51:32,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1318844529] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:51:32,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [438624911] [2021-12-07 00:51:32,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:32,909 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:51:32,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:51:32,909 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:51:32,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-12-07 00:51:33,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:33,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-07 00:51:33,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:33,048 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 [2021-12-07 00:51:33,053 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 [2021-12-07 00:51:37,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:51:37,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:51:37,248 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:51:37,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:51:37,254 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:37,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:37,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [438624911] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:51:37,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:51:37,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-07 00:51:37,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372787761] [2021-12-07 00:51:37,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:51:37,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-07 00:51:37,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:37,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-07 00:51:37,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-07 00:51:37,442 INFO L87 Difference]: Start difference. First operand 208 states and 249 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-07 00:51:37,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:37,992 INFO L93 Difference]: Finished difference Result 227 states and 281 transitions. [2021-12-07 00:51:37,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-07 00:51:37,993 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-12-07 00:51:37,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:37,995 INFO L225 Difference]: With dead ends: 227 [2021-12-07 00:51:37,995 INFO L226 Difference]: Without dead ends: 227 [2021-12-07 00:51:37,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-07 00:51:37,995 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 102 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:37,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 310 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 296 Invalid, 0 Unknown, 183 Unchecked, 0.5s Time] [2021-12-07 00:51:37,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-07 00:51:38,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 224. [2021-12-07 00:51:38,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 124 states have (on average 1.532258064516129) internal successors, (190), 176 states have internal predecessors, (190), 34 states have call successors, (34), 10 states have call predecessors, (34), 13 states have return successors, (48), 37 states have call predecessors, (48), 34 states have call successors, (48) [2021-12-07 00:51:38,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 272 transitions. [2021-12-07 00:51:38,005 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 272 transitions. Word has length 25 [2021-12-07 00:51:38,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:38,005 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 272 transitions. [2021-12-07 00:51:38,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-07 00:51:38,005 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 272 transitions. [2021-12-07 00:51:38,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-07 00:51:38,006 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:38,006 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:38,009 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (11)] Ended with exit code 0 [2021-12-07 00:51:38,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-07 00:51:38,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:38,409 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:38,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:38,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050227, now seen corresponding path program 1 times [2021-12-07 00:51:38,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:38,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1903386704] [2021-12-07 00:51:38,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:38,412 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:38,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:38,413 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:38,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-07 00:51:38,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:38,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-07 00:51:38,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:38,492 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 [2021-12-07 00:51:38,579 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:38,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:38,749 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:38,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1903386704] [2021-12-07 00:51:38,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1903386704] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:51:38,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:51:38,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-07 00:51:38,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966911532] [2021-12-07 00:51:38,749 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:51:38,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-07 00:51:38,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:38,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-07 00:51:38,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-07 00:51:38,750 INFO L87 Difference]: Start difference. First operand 224 states and 272 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-07 00:51:39,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:39,863 INFO L93 Difference]: Finished difference Result 244 states and 296 transitions. [2021-12-07 00:51:39,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 00:51:39,863 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2021-12-07 00:51:39,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:39,865 INFO L225 Difference]: With dead ends: 244 [2021-12-07 00:51:39,865 INFO L226 Difference]: Without dead ends: 244 [2021-12-07 00:51:39,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 10 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-12-07 00:51:39,866 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 158 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 669 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:39,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 669 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 982 Invalid, 0 Unknown, 55 Unchecked, 1.0s Time] [2021-12-07 00:51:39,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-07 00:51:39,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2021-12-07 00:51:39,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 135 states have (on average 1.5185185185185186) internal successors, (205), 185 states have internal predecessors, (205), 36 states have call successors, (36), 11 states have call predecessors, (36), 14 states have return successors, (50), 39 states have call predecessors, (50), 36 states have call successors, (50) [2021-12-07 00:51:39,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 291 transitions. [2021-12-07 00:51:39,874 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 291 transitions. Word has length 25 [2021-12-07 00:51:39,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:39,874 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 291 transitions. [2021-12-07 00:51:39,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-07 00:51:39,875 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 291 transitions. [2021-12-07 00:51:39,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-07 00:51:39,875 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:39,876 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:39,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-12-07 00:51:40,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:40,076 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:40,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:40,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050226, now seen corresponding path program 1 times [2021-12-07 00:51:40,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:40,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1096417132] [2021-12-07 00:51:40,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:40,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:40,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:40,078 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:40,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-07 00:51:40,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:40,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-07 00:51:40,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:40,144 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 [2021-12-07 00:51:40,283 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:40,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:41,272 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:51:41,272 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:41,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1096417132] [2021-12-07 00:51:41,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1096417132] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:51:41,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:51:41,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-07 00:51:41,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854683336] [2021-12-07 00:51:41,273 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:51:41,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-07 00:51:41,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:41,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-07 00:51:41,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-07 00:51:41,274 INFO L87 Difference]: Start difference. First operand 236 states and 291 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:51:45,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:45,508 INFO L93 Difference]: Finished difference Result 261 states and 327 transitions. [2021-12-07 00:51:45,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-07 00:51:45,509 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2021-12-07 00:51:45,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:45,510 INFO L225 Difference]: With dead ends: 261 [2021-12-07 00:51:45,510 INFO L226 Difference]: Without dead ends: 261 [2021-12-07 00:51:45,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-12-07 00:51:45,511 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 143 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 1482 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 729 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:45,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 729 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1482 Invalid, 0 Unknown, 47 Unchecked, 3.9s Time] [2021-12-07 00:51:45,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-12-07 00:51:45,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 252. [2021-12-07 00:51:45,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 147 states have (on average 1.4965986394557824) internal successors, (220), 197 states have internal predecessors, (220), 39 states have call successors, (39), 12 states have call predecessors, (39), 15 states have return successors, (53), 42 states have call predecessors, (53), 39 states have call successors, (53) [2021-12-07 00:51:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 312 transitions. [2021-12-07 00:51:45,519 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 312 transitions. Word has length 25 [2021-12-07 00:51:45,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:45,520 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 312 transitions. [2021-12-07 00:51:45,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:51:45,520 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 312 transitions. [2021-12-07 00:51:45,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-07 00:51:45,521 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:45,521 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:45,532 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (13)] Ended with exit code 0 [2021-12-07 00:51:45,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:45,722 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:45,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:45,723 INFO L85 PathProgramCache]: Analyzing trace with hash 369889479, now seen corresponding path program 1 times [2021-12-07 00:51:45,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:45,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1079749982] [2021-12-07 00:51:45,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:45,725 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:45,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:45,727 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:45,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-07 00:51:45,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:45,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-07 00:51:45,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:45,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-07 00:51:45,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:45,853 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:45,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1079749982] [2021-12-07 00:51:45,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1079749982] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:45,853 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:45,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-07 00:51:45,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518144777] [2021-12-07 00:51:45,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:45,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-07 00:51:45,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:45,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-07 00:51:45,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-07 00:51:45,854 INFO L87 Difference]: Start difference. First operand 252 states and 312 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:51:45,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:45,868 INFO L93 Difference]: Finished difference Result 242 states and 293 transitions. [2021-12-07 00:51:45,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-07 00:51:45,868 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-12-07 00:51:45,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:45,869 INFO L225 Difference]: With dead ends: 242 [2021-12-07 00:51:45,869 INFO L226 Difference]: Without dead ends: 226 [2021-12-07 00:51:45,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-07 00:51:45,870 INFO L933 BasicCegarLoop]: 188 mSDtfsCounter, 0 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:45,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 748 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-07 00:51:45,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-12-07 00:51:45,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2021-12-07 00:51:45,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5307692307692307) internal successors, (199), 181 states have internal predecessors, (199), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-07 00:51:45,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 277 transitions. [2021-12-07 00:51:45,877 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 277 transitions. Word has length 30 [2021-12-07 00:51:45,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:45,877 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 277 transitions. [2021-12-07 00:51:45,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:51:45,878 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 277 transitions. [2021-12-07 00:51:45,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-07 00:51:45,878 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:45,878 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:45,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-12-07 00:51:46,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:46,080 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:46,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:46,081 INFO L85 PathProgramCache]: Analyzing trace with hash -648076771, now seen corresponding path program 1 times [2021-12-07 00:51:46,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:46,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [53378789] [2021-12-07 00:51:46,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:46,083 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:46,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:46,085 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:46,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-07 00:51:46,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:46,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-07 00:51:46,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:46,228 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-07 00:51:46,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-07 00:51:46,228 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:46,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [53378789] [2021-12-07 00:51:46,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [53378789] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-07 00:51:46,229 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-07 00:51:46,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-07 00:51:46,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631148056] [2021-12-07 00:51:46,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-07 00:51:46,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-07 00:51:46,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:46,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-07 00:51:46,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-07 00:51:46,230 INFO L87 Difference]: Start difference. First operand 226 states and 277 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-07 00:51:46,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:46,446 INFO L93 Difference]: Finished difference Result 232 states and 286 transitions. [2021-12-07 00:51:46,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:51:46,447 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-12-07 00:51:46,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:46,448 INFO L225 Difference]: With dead ends: 232 [2021-12-07 00:51:46,448 INFO L226 Difference]: Without dead ends: 228 [2021-12-07 00:51:46,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-07 00:51:46,449 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 109 mSDsluCounter, 883 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:46,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 1054 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-07 00:51:46,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-12-07 00:51:46,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 226. [2021-12-07 00:51:46,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 130 states have (on average 1.5153846153846153) internal successors, (197), 181 states have internal predecessors, (197), 31 states have call successors, (31), 10 states have call predecessors, (31), 14 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-07 00:51:46,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 275 transitions. [2021-12-07 00:51:46,456 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 275 transitions. Word has length 31 [2021-12-07 00:51:46,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:46,456 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 275 transitions. [2021-12-07 00:51:46,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-07 00:51:46,457 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 275 transitions. [2021-12-07 00:51:46,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-07 00:51:46,457 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:46,457 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-12-07 00:51:46,465 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (15)] Ended with exit code 0 [2021-12-07 00:51:46,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:46,658 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:46,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:46,659 INFO L85 PathProgramCache]: Analyzing trace with hash -2088825952, now seen corresponding path program 1 times [2021-12-07 00:51:46,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:46,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [316249065] [2021-12-07 00:51:46,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:46,659 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:46,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:46,660 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:46,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-07 00:51:46,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:46,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-07 00:51:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:46,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:51:46,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:51:46,860 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-07 00:51:46,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:51:46,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:51:46,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:51:47,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-07 00:51:47,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-07 00:51:47,125 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-07 00:51:47,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:47,821 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-07 00:51:47,821 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:47,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [316249065] [2021-12-07 00:51:47,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [316249065] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:51:47,821 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:51:47,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-07 00:51:47,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319980760] [2021-12-07 00:51:47,821 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:51:47,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-07 00:51:47,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:51:47,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-07 00:51:47,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-07 00:51:47,822 INFO L87 Difference]: Start difference. First operand 226 states and 275 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:51:48,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:51:48,716 INFO L93 Difference]: Finished difference Result 244 states and 299 transitions. [2021-12-07 00:51:48,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-07 00:51:48,717 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-12-07 00:51:48,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:51:48,718 INFO L225 Difference]: With dead ends: 244 [2021-12-07 00:51:48,718 INFO L226 Difference]: Without dead ends: 244 [2021-12-07 00:51:48,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-07 00:51:48,719 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 44 mSDsluCounter, 2032 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2223 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-07 00:51:48,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 2223 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 345 Invalid, 0 Unknown, 107 Unchecked, 0.7s Time] [2021-12-07 00:51:48,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-07 00:51:48,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 233. [2021-12-07 00:51:48,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-07 00:51:48,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-07 00:51:48,728 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 31 [2021-12-07 00:51:48,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:51:48,728 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-07 00:51:48,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 4 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:51:48,728 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-07 00:51:48,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:51:48,729 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:51:48,729 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-07 00:51:48,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-12-07 00:51:48,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:51:48,931 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:51:48,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:51:48,932 INFO L85 PathProgramCache]: Analyzing trace with hash -931523584, now seen corresponding path program 1 times [2021-12-07 00:51:48,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:51:48,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1936930678] [2021-12-07 00:51:48,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:48,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:51:48,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:51:48,936 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:51:48,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-07 00:51:49,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:49,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-07 00:51:49,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:49,291 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 6 treesize of output 5 [2021-12-07 00:51:49,295 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 [2021-12-07 00:51:53,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:51:53,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:51:53,531 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:51:53,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-12-07 00:51:53,546 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-07 00:51:53,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:51:55,758 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:51:55,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1936930678] [2021-12-07 00:51:55,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1936930678] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:51:55,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1851400211] [2021-12-07 00:51:55,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:51:55,759 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:51:55,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:51:55,759 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:51:55,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-07 00:51:55,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:51:55,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-07 00:51:55,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:51:56,007 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 [2021-12-07 00:51:56,013 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 [2021-12-07 00:52:02,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:52:02,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:52:02,247 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:52:02,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:52:02,253 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-07 00:52:02,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:04,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1851400211] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:04,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:52:04,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-07 00:52:04,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646622960] [2021-12-07 00:52:04,418 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:52:04,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-07 00:52:04,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:52:04,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-07 00:52:04,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-07 00:52:04,419 INFO L87 Difference]: Start difference. First operand 233 states and 281 transitions. Second operand has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-07 00:52:05,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:52:05,047 INFO L93 Difference]: Finished difference Result 238 states and 292 transitions. [2021-12-07 00:52:05,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-07 00:52:05,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 45 [2021-12-07 00:52:05,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:52:05,050 INFO L225 Difference]: With dead ends: 238 [2021-12-07 00:52:05,050 INFO L226 Difference]: Without dead ends: 238 [2021-12-07 00:52:05,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-07 00:52:05,050 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 170 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-07 00:52:05,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 312 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 371 Invalid, 0 Unknown, 174 Unchecked, 0.6s Time] [2021-12-07 00:52:05,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-12-07 00:52:05,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 234. [2021-12-07 00:52:05,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 136 states have (on average 1.5073529411764706) internal successors, (205), 186 states have internal predecessors, (205), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 35 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-07 00:52:05,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 283 transitions. [2021-12-07 00:52:05,057 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 283 transitions. Word has length 45 [2021-12-07 00:52:05,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:52:05,057 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 283 transitions. [2021-12-07 00:52:05,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-12-07 00:52:05,058 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 283 transitions. [2021-12-07 00:52:05,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:52:05,058 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:52:05,058 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-07 00:52:05,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-07 00:52:05,266 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-12-07 00:52:05,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 00:52:05,460 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:52:05,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:52:05,461 INFO L85 PathProgramCache]: Analyzing trace with hash -931523585, now seen corresponding path program 1 times [2021-12-07 00:52:05,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:52:05,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382186430] [2021-12-07 00:52:05,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:52:05,463 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:52:05,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:52:05,464 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:52:05,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-07 00:52:05,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:52:05,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-07 00:52:05,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:05,715 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 [2021-12-07 00:52:05,866 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-07 00:52:05,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 31 [2021-12-07 00:52:05,874 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-07 00:52:05,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:05,965 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:52:05,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382186430] [2021-12-07 00:52:05,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382186430] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:05,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1207981167] [2021-12-07 00:52:05,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:52:05,965 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:52:05,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:52:05,966 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:52:05,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-07 00:52:06,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:52:06,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-07 00:52:06,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:06,212 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 [2021-12-07 00:52:08,343 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-07 00:52:08,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 21 [2021-12-07 00:52:08,352 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-07 00:52:08,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:08,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1207981167] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:08,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:52:08,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-07 00:52:08,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929310781] [2021-12-07 00:52:08,439 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:52:08,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-07 00:52:08,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:52:08,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-07 00:52:08,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-07 00:52:08,440 INFO L87 Difference]: Start difference. First operand 234 states and 283 transitions. Second operand has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-07 00:52:14,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:52:14,821 INFO L93 Difference]: Finished difference Result 237 states and 291 transitions. [2021-12-07 00:52:14,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-07 00:52:14,822 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 45 [2021-12-07 00:52:14,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:52:14,824 INFO L225 Difference]: With dead ends: 237 [2021-12-07 00:52:14,824 INFO L226 Difference]: Without dead ends: 237 [2021-12-07 00:52:14,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 88 SyntacticMatches, 10 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-07 00:52:14,824 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 83 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 294 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:52:14,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 366 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 196 Invalid, 0 Unknown, 294 Unchecked, 0.3s Time] [2021-12-07 00:52:14,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-12-07 00:52:14,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 233. [2021-12-07 00:52:14,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 135 states have (on average 1.5037037037037038) internal successors, (203), 186 states have internal predecessors, (203), 31 states have call successors, (31), 12 states have call predecessors, (31), 16 states have return successors, (47), 34 states have call predecessors, (47), 31 states have call successors, (47) [2021-12-07 00:52:14,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-07 00:52:14,831 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 45 [2021-12-07 00:52:14,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:52:14,831 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-07 00:52:14,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.6) internal successors, (33), 6 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-12-07 00:52:14,831 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-07 00:52:14,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-07 00:52:14,832 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:52:14,832 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-07 00:52:14,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-07 00:52:15,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-12-07 00:52:15,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 00:52:15,233 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:52:15,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:52:15,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1901629290, now seen corresponding path program 2 times [2021-12-07 00:52:15,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:52:15,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [511539857] [2021-12-07 00:52:15,235 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:52:15,236 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:52:15,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:52:15,237 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:52:15,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-07 00:52:15,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:52:15,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:52:15,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-07 00:52:15,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:15,492 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 [2021-12-07 00:52:19,868 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-07 00:52:19,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 44 [2021-12-07 00:52:19,961 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-07 00:52:19,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:22,066 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:52:22,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [511539857] [2021-12-07 00:52:22,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [511539857] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:22,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1966210500] [2021-12-07 00:52:22,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:52:22,067 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:52:22,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:52:22,068 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:52:22,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-07 00:52:22,260 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 00:52:22,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304420149] [2021-12-07 00:52:22,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:52:22,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:52:22,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:52:22,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 1 [2021-12-07 00:52:22,262 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:52:22,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-07 00:52:22,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:52:22,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:52:22,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-07 00:52:22,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:22,391 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 [2021-12-07 00:52:32,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 00:52:32,899 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-12-07 00:52:32,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 35 [2021-12-07 00:52:32,917 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 30 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-07 00:52:32,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:33,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304420149] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:33,094 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:52:33,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-12-07 00:52:33,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482264560] [2021-12-07 00:52:33,094 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:52:33,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-07 00:52:33,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:52:33,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-07 00:52:33,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=95, Unknown=6, NotChecked=0, Total=132 [2021-12-07 00:52:33,095 INFO L87 Difference]: Start difference. First operand 233 states and 281 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-07 00:52:47,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:52:47,687 INFO L93 Difference]: Finished difference Result 271 states and 338 transitions. [2021-12-07 00:52:47,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 00:52:47,688 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) Word has length 49 [2021-12-07 00:52:47,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:52:47,689 INFO L225 Difference]: With dead ends: 271 [2021-12-07 00:52:47,689 INFO L226 Difference]: Without dead ends: 271 [2021-12-07 00:52:47,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=69, Invalid=161, Unknown=10, NotChecked=0, Total=240 [2021-12-07 00:52:47,690 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 12 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 403 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:52:47,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 621 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 403 Unchecked, 0.2s Time] [2021-12-07 00:52:47,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-12-07 00:52:47,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 270. [2021-12-07 00:52:47,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 161 states have (on average 1.4472049689440993) internal successors, (233), 213 states have internal predecessors, (233), 36 states have call successors, (36), 15 states have call predecessors, (36), 22 states have return successors, (69), 41 states have call predecessors, (69), 36 states have call successors, (69) [2021-12-07 00:52:47,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 338 transitions. [2021-12-07 00:52:47,700 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 338 transitions. Word has length 49 [2021-12-07 00:52:47,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:52:47,700 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 338 transitions. [2021-12-07 00:52:47,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 states have internal predecessors, (39), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-12-07 00:52:47,700 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 338 transitions. [2021-12-07 00:52:47,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-07 00:52:47,702 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:52:47,702 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:52:47,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-12-07 00:52:47,910 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-12-07 00:52:48,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:52:48,103 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:52:48,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:52:48,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1545271268, now seen corresponding path program 2 times [2021-12-07 00:52:48,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:52:48,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1440951676] [2021-12-07 00:52:48,107 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:52:48,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:52:48,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:52:48,111 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:52:48,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-07 00:52:48,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:52:48,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:52:48,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-07 00:52:48,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:48,391 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 [2021-12-07 00:52:48,396 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 [2021-12-07 00:52:56,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:52:56,752 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:52:56,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:52:56,762 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:52:56,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:52:56,814 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-07 00:52:56,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:52:57,679 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:52:57,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1440951676] [2021-12-07 00:52:57,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1440951676] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:52:57,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [742145051] [2021-12-07 00:52:57,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:52:57,680 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:52:57,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:52:57,681 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:52:57,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-12-07 00:52:57,931 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:52:57,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:52:57,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-07 00:52:57,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:52:57,961 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 [2021-12-07 00:52:57,967 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 [2021-12-07 00:53:04,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:53:04,258 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:53:04,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:53:04,271 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:53:04,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:53:04,317 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-07 00:53:04,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:53:08,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [742145051] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:53:08,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:53:08,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-07 00:53:08,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049904379] [2021-12-07 00:53:08,840 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:53:08,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-07 00:53:08,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:53:08,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-07 00:53:08,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=83, Unknown=3, NotChecked=0, Total=110 [2021-12-07 00:53:08,841 INFO L87 Difference]: Start difference. First operand 270 states and 338 transitions. Second operand has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-07 00:53:11,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:53:11,469 INFO L93 Difference]: Finished difference Result 276 states and 355 transitions. [2021-12-07 00:53:11,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-07 00:53:11,470 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 55 [2021-12-07 00:53:11,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:53:11,471 INFO L225 Difference]: With dead ends: 276 [2021-12-07 00:53:11,471 INFO L226 Difference]: Without dead ends: 276 [2021-12-07 00:53:11,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 97 SyntacticMatches, 7 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=32, Invalid=96, Unknown=4, NotChecked=0, Total=132 [2021-12-07 00:53:11,472 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 168 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 480 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-07 00:53:11,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 408 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 360 Invalid, 0 Unknown, 480 Unchecked, 0.6s Time] [2021-12-07 00:53:11,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-12-07 00:53:11,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 275. [2021-12-07 00:53:11,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 165 states have (on average 1.4424242424242424) internal successors, (238), 216 states have internal predecessors, (238), 36 states have call successors, (36), 15 states have call predecessors, (36), 23 states have return successors, (81), 43 states have call predecessors, (81), 36 states have call successors, (81) [2021-12-07 00:53:11,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 355 transitions. [2021-12-07 00:53:11,479 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 355 transitions. Word has length 55 [2021-12-07 00:53:11,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:53:11,480 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 355 transitions. [2021-12-07 00:53:11,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-07 00:53:11,480 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 355 transitions. [2021-12-07 00:53:11,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-07 00:53:11,481 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:53:11,481 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:53:11,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-12-07 00:53:11,692 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-12-07 00:53:11,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:53:11,882 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:53:11,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:53:11,883 INFO L85 PathProgramCache]: Analyzing trace with hash -1545271269, now seen corresponding path program 2 times [2021-12-07 00:53:11,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:53:11,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1692464418] [2021-12-07 00:53:11,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:53:11,885 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:53:11,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:53:11,888 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:53:11,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-12-07 00:53:12,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:53:12,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:53:12,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-07 00:53:12,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:53:12,295 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 [2021-12-07 00:53:16,653 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-07 00:53:16,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 45 [2021-12-07 00:53:16,750 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 34 refuted. 6 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-07 00:53:16,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:53:20,874 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:53:20,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1692464418] [2021-12-07 00:53:20,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1692464418] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:53:20,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [491173010] [2021-12-07 00:53:20,875 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:53:20,875 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:53:20,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:53:20,875 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:53:20,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-12-07 00:53:21,094 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 00:53:21,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677436668] [2021-12-07 00:53:21,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:53:21,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:53:21,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:53:21,095 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:53:21,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-07 00:53:21,097 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 1 [2021-12-07 00:53:21,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:53:21,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:53:21,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-07 00:53:21,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:53:21,238 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 [2021-12-07 00:53:27,633 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 00:53:27,653 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-12-07 00:53:27,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 33 [2021-12-07 00:53:27,670 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-07 00:53:27,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:53:27,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677436668] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:53:27,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:53:27,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-12-07 00:53:27,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184188501] [2021-12-07 00:53:27,931 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:53:27,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-07 00:53:27,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:53:27,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-07 00:53:27,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=124, Unknown=6, NotChecked=0, Total=182 [2021-12-07 00:53:27,932 INFO L87 Difference]: Start difference. First operand 275 states and 355 transitions. Second operand has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-07 00:53:40,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:53:40,467 INFO L93 Difference]: Finished difference Result 275 states and 354 transitions. [2021-12-07 00:53:40,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:53:40,468 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) Word has length 55 [2021-12-07 00:53:40,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:53:40,470 INFO L225 Difference]: With dead ends: 275 [2021-12-07 00:53:40,470 INFO L226 Difference]: Without dead ends: 275 [2021-12-07 00:53:40,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 97 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=91, Invalid=174, Unknown=7, NotChecked=0, Total=272 [2021-12-07 00:53:40,470 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 88 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 754 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-07 00:53:40,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 571 Invalid, 964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 189 Invalid, 0 Unknown, 754 Unchecked, 0.3s Time] [2021-12-07 00:53:40,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-12-07 00:53:40,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 274. [2021-12-07 00:53:40,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 164 states have (on average 1.4390243902439024) internal successors, (236), 216 states have internal predecessors, (236), 36 states have call successors, (36), 15 states have call predecessors, (36), 23 states have return successors, (81), 42 states have call predecessors, (81), 36 states have call successors, (81) [2021-12-07 00:53:40,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 353 transitions. [2021-12-07 00:53:40,481 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 353 transitions. Word has length 55 [2021-12-07 00:53:40,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:53:40,481 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 353 transitions. [2021-12-07 00:53:40,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-07 00:53:40,481 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 353 transitions. [2021-12-07 00:53:40,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-07 00:53:40,482 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:53:40,482 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:53:40,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-07 00:53:40,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-12-07 00:53:40,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:53:40,884 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:53:40,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:53:40,885 INFO L85 PathProgramCache]: Analyzing trace with hash 104860, now seen corresponding path program 3 times [2021-12-07 00:53:40,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:53:40,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317373931] [2021-12-07 00:53:40,887 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:53:40,888 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:53:40,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:53:40,890 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:53:40,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-12-07 00:53:41,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-07 00:53:41,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:53:41,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-07 00:53:41,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:53:41,206 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 [2021-12-07 00:53:43,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:53:43,574 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:53:43,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:53:43,584 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:53:43,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:53:43,598 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 49 proven. 44 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-07 00:53:43,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:53:44,310 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:53:44,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317373931] [2021-12-07 00:53:44,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317373931] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:53:44,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1953555358] [2021-12-07 00:53:44,310 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:53:44,311 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:53:44,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:53:44,311 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:53:44,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-12-07 00:53:44,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-07 00:53:44,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:53:44,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-07 00:53:44,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:53:44,745 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 [2021-12-07 00:54:18,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:54:18,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:54:18,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:54:18,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2021-12-07 00:54:18,698 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-12-07 00:54:18,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 46 [2021-12-07 00:54:18,724 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 48 proven. 52 refuted. 3 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-07 00:54:18,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:54:19,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1953555358] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:54:19,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:54:19,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 13 [2021-12-07 00:54:19,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523903755] [2021-12-07 00:54:19,288 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:54:19,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-07 00:54:19,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:54:19,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-07 00:54:19,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=215, Unknown=15, NotChecked=0, Total=272 [2021-12-07 00:54:19,289 INFO L87 Difference]: Start difference. First operand 274 states and 353 transitions. Second operand has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) [2021-12-07 00:55:28,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:55:28,296 INFO L93 Difference]: Finished difference Result 316 states and 423 transitions. [2021-12-07 00:55:28,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-07 00:55:28,297 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) Word has length 55 [2021-12-07 00:55:28,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:55:28,298 INFO L225 Difference]: With dead ends: 316 [2021-12-07 00:55:28,298 INFO L226 Difference]: Without dead ends: 314 [2021-12-07 00:55:28,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 104.6s TimeCoverageRelationStatistics Valid=127, Invalid=531, Unknown=44, NotChecked=0, Total=702 [2021-12-07 00:55:28,299 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 170 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 1066 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 796 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:55:28,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 432 Invalid, 1066 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 219 Invalid, 0 Unknown, 796 Unchecked, 0.5s Time] [2021-12-07 00:55:28,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-12-07 00:55:28,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 309. [2021-12-07 00:55:28,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 189 states have (on average 1.3915343915343916) internal successors, (263), 241 states have internal predecessors, (263), 42 states have call successors, (42), 17 states have call predecessors, (42), 27 states have return successors, (111), 50 states have call predecessors, (111), 42 states have call successors, (111) [2021-12-07 00:55:28,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 416 transitions. [2021-12-07 00:55:28,308 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 416 transitions. Word has length 55 [2021-12-07 00:55:28,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:55:28,308 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 416 transitions. [2021-12-07 00:55:28,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.923076923076923) internal successors, (51), 13 states have internal predecessors, (51), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 7 states have call predecessors, (13), 9 states have call successors, (13) [2021-12-07 00:55:28,308 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 416 transitions. [2021-12-07 00:55:28,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-07 00:55:28,309 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:55:28,309 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:55:28,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-12-07 00:55:28,545 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-12-07 00:55:28,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:55:28,711 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:55:28,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:55:28,712 INFO L85 PathProgramCache]: Analyzing trace with hash 104859, now seen corresponding path program 3 times [2021-12-07 00:55:28,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:55:28,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [270315832] [2021-12-07 00:55:28,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:55:28,714 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:55:28,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:55:28,714 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:55:28,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-12-07 00:55:29,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-07 00:55:29,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:55:29,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-07 00:55:29,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:55:39,705 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-07 00:55:39,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 42 [2021-12-07 00:55:39,832 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 26 refuted. 2 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-07 00:55:39,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:55:42,088 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:55:42,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [270315832] [2021-12-07 00:55:42,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [270315832] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:55:42,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1063777688] [2021-12-07 00:55:42,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:55:42,089 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:55:42,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:55:42,089 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:55:42,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-12-07 00:55:42,295 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 00:55:42,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860878060] [2021-12-07 00:55:42,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:55:42,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:55:42,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:55:42,297 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:55:42,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-07 00:55:42,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 1 [2021-12-07 00:55:45,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-07 00:55:45,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:55:45,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-07 00:55:45,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:55:49,128 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-12-07 00:55:49,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 31 [2021-12-07 00:55:49,148 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 62 proven. 25 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-12-07 00:55:49,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:55:49,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860878060] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:55:49,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:55:49,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-12-07 00:55:49,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873705057] [2021-12-07 00:55:49,436 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:55:49,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-07 00:55:49,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:55:49,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-07 00:55:49,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=111, Unknown=4, NotChecked=0, Total=156 [2021-12-07 00:55:49,436 INFO L87 Difference]: Start difference. First operand 309 states and 416 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-12-07 00:56:12,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:56:12,423 INFO L93 Difference]: Finished difference Result 356 states and 491 transitions. [2021-12-07 00:56:12,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-07 00:56:12,423 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) Word has length 55 [2021-12-07 00:56:12,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:56:12,425 INFO L225 Difference]: With dead ends: 356 [2021-12-07 00:56:12,425 INFO L226 Difference]: Without dead ends: 356 [2021-12-07 00:56:12,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 38.3s TimeCoverageRelationStatistics Valid=93, Invalid=201, Unknown=12, NotChecked=0, Total=306 [2021-12-07 00:56:12,426 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 15 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 682 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:56:12,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 705 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 682 Unchecked, 0.2s Time] [2021-12-07 00:56:12,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-12-07 00:56:12,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 345. [2021-12-07 00:56:12,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 214 states have (on average 1.3457943925233644) internal successors, (288), 269 states have internal predecessors, (288), 48 states have call successors, (48), 18 states have call predecessors, (48), 32 states have return successors, (139), 57 states have call predecessors, (139), 48 states have call successors, (139) [2021-12-07 00:56:12,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 475 transitions. [2021-12-07 00:56:12,436 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 475 transitions. Word has length 55 [2021-12-07 00:56:12,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:56:12,436 INFO L470 AbstractCegarLoop]: Abstraction has 345 states and 475 transitions. [2021-12-07 00:56:12,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (11), 6 states have call predecessors, (11), 7 states have call successors, (11) [2021-12-07 00:56:12,437 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 475 transitions. [2021-12-07 00:56:12,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-07 00:56:12,437 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:56:12,437 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-12-07 00:56:12,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (31)] Ended with exit code 0 [2021-12-07 00:56:12,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-12-07 00:56:12,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:56:12,839 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:56:12,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:56:12,840 INFO L85 PathProgramCache]: Analyzing trace with hash -189298011, now seen corresponding path program 2 times [2021-12-07 00:56:12,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:56:12,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1297427325] [2021-12-07 00:56:12,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:56:12,841 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:56:12,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:56:12,844 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:56:12,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-12-07 00:56:13,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:56:13,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:56:13,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-07 00:56:13,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:56:13,093 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 [2021-12-07 00:56:13,098 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 [2021-12-07 00:56:19,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:56:19,485 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:56:19,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:56:19,499 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:56:19,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:56:19,565 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-07 00:56:19,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:56:24,221 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:56:24,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1297427325] [2021-12-07 00:56:24,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1297427325] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:56:24,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [881348523] [2021-12-07 00:56:24,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:56:24,222 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:56:24,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:56:24,223 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:56:24,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-12-07 00:56:24,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:56:24,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:56:24,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-07 00:56:24,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:56:24,500 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 [2021-12-07 00:56:24,507 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 6 treesize of output 5 [2021-12-07 00:56:28,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:56:28,826 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:56:28,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:56:28,842 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:56:28,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:56:28,900 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-07 00:56:28,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:56:33,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [881348523] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:56:33,579 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:56:33,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-07 00:56:33,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068782646] [2021-12-07 00:56:33,579 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:56:33,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-07 00:56:33,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:56:33,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-07 00:56:33,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=81, Unknown=5, NotChecked=0, Total=110 [2021-12-07 00:56:33,580 INFO L87 Difference]: Start difference. First operand 345 states and 475 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-07 00:56:38,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:56:38,148 INFO L93 Difference]: Finished difference Result 363 states and 506 transitions. [2021-12-07 00:56:38,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-07 00:56:38,148 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 39 [2021-12-07 00:56:38,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:56:38,150 INFO L225 Difference]: With dead ends: 363 [2021-12-07 00:56:38,151 INFO L226 Difference]: Without dead ends: 363 [2021-12-07 00:56:38,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=40, Invalid=109, Unknown=7, NotChecked=0, Total=156 [2021-12-07 00:56:38,151 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 169 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 472 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-07 00:56:38,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 361 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 216 Invalid, 0 Unknown, 472 Unchecked, 0.5s Time] [2021-12-07 00:56:38,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2021-12-07 00:56:38,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 355. [2021-12-07 00:56:38,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 221 states have (on average 1.330316742081448) internal successors, (294), 277 states have internal predecessors, (294), 50 states have call successors, (50), 18 states have call predecessors, (50), 33 states have return successors, (148), 59 states have call predecessors, (148), 50 states have call successors, (148) [2021-12-07 00:56:38,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 492 transitions. [2021-12-07 00:56:38,161 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 492 transitions. Word has length 39 [2021-12-07 00:56:38,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:56:38,161 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 492 transitions. [2021-12-07 00:56:38,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-07 00:56:38,162 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 492 transitions. [2021-12-07 00:56:38,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-07 00:56:38,162 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:56:38,162 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:56:38,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (35)] Ended with exit code 0 [2021-12-07 00:56:38,396 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-12-07 00:56:38,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:56:38,564 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:56:38,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:56:38,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1322566655, now seen corresponding path program 1 times [2021-12-07 00:56:38,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:56:38,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1265245128] [2021-12-07 00:56:38,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:56:38,567 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:56:38,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:56:38,570 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:56:38,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-12-07 00:56:38,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:56:38,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-07 00:56:38,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:56:38,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:56:38,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:56:39,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-07 00:56:39,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-07 00:56:39,281 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:56:39,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:56:39,619 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:56:39,619 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:56:39,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1265245128] [2021-12-07 00:56:39,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1265245128] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:56:39,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:56:39,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 14 [2021-12-07 00:56:39,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478617379] [2021-12-07 00:56:39,620 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:56:39,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-07 00:56:39,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:56:39,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-07 00:56:39,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-12-07 00:56:39,621 INFO L87 Difference]: Start difference. First operand 355 states and 492 transitions. Second operand has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-07 00:56:40,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:56:40,198 INFO L93 Difference]: Finished difference Result 403 states and 576 transitions. [2021-12-07 00:56:40,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-07 00:56:40,199 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2021-12-07 00:56:40,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:56:40,201 INFO L225 Difference]: With dead ends: 403 [2021-12-07 00:56:40,202 INFO L226 Difference]: Without dead ends: 403 [2021-12-07 00:56:40,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-12-07 00:56:40,202 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 50 mSDsluCounter, 1333 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 1523 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:56:40,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 1523 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 0 Unknown, 59 Unchecked, 0.4s Time] [2021-12-07 00:56:40,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-12-07 00:56:40,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 393. [2021-12-07 00:56:40,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 250 states have (on average 1.344) internal successors, (336), 306 states have internal predecessors, (336), 55 states have call successors, (55), 21 states have call predecessors, (55), 37 states have return successors, (179), 65 states have call predecessors, (179), 55 states have call successors, (179) [2021-12-07 00:56:40,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 570 transitions. [2021-12-07 00:56:40,216 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 570 transitions. Word has length 38 [2021-12-07 00:56:40,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:56:40,216 INFO L470 AbstractCegarLoop]: Abstraction has 393 states and 570 transitions. [2021-12-07 00:56:40,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-07 00:56:40,216 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 570 transitions. [2021-12-07 00:56:40,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-07 00:56:40,217 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:56:40,217 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:56:40,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-12-07 00:56:40,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:56:40,418 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:56:40,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:56:40,420 INFO L85 PathProgramCache]: Analyzing trace with hash -1786565566, now seen corresponding path program 2 times [2021-12-07 00:56:40,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:56:40,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [439749726] [2021-12-07 00:56:40,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:56:40,421 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:56:40,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:56:40,424 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:56:40,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-12-07 00:56:40,619 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:56:40,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:56:40,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-07 00:56:40,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:56:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-07 00:56:40,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:56:41,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-12-07 00:56:41,545 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-07 00:56:41,545 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:56:41,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [439749726] [2021-12-07 00:56:41,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [439749726] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:56:41,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:56:41,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-07 00:56:41,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510940049] [2021-12-07 00:56:41,545 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:56:41,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-07 00:56:41,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:56:41,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-07 00:56:41,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-12-07 00:56:41,546 INFO L87 Difference]: Start difference. First operand 393 states and 570 transitions. Second operand has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-07 00:56:44,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:56:44,103 INFO L93 Difference]: Finished difference Result 397 states and 573 transitions. [2021-12-07 00:56:44,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-07 00:56:44,103 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 39 [2021-12-07 00:56:44,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:56:44,105 INFO L225 Difference]: With dead ends: 397 [2021-12-07 00:56:44,105 INFO L226 Difference]: Without dead ends: 397 [2021-12-07 00:56:44,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-12-07 00:56:44,106 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 71 mSDsluCounter, 1337 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 1517 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:56:44,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 1517 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-12-07 00:56:44,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-12-07 00:56:44,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 393. [2021-12-07 00:56:44,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 250 states have (on average 1.32) internal successors, (330), 306 states have internal predecessors, (330), 55 states have call successors, (55), 21 states have call predecessors, (55), 37 states have return successors, (179), 65 states have call predecessors, (179), 55 states have call successors, (179) [2021-12-07 00:56:44,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 564 transitions. [2021-12-07 00:56:44,118 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 564 transitions. Word has length 39 [2021-12-07 00:56:44,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:56:44,118 INFO L470 AbstractCegarLoop]: Abstraction has 393 states and 564 transitions. [2021-12-07 00:56:44,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-07 00:56:44,118 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 564 transitions. [2021-12-07 00:56:44,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-07 00:56:44,119 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:56:44,119 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-12-07 00:56:44,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-12-07 00:56:44,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:56:44,320 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:56:44,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:56:44,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1734674140, now seen corresponding path program 3 times [2021-12-07 00:56:44,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:56:44,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1670386736] [2021-12-07 00:56:44,321 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:56:44,321 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:56:44,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:56:44,321 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:56:44,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-12-07 00:56:44,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-07 00:56:44,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:56:44,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-07 00:56:44,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:56:44,549 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 [2021-12-07 00:56:57,083 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-07 00:56:57,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 43 [2021-12-07 00:56:57,205 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 7 proven. 23 refuted. 5 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-07 00:56:57,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:56:59,415 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:56:59,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1670386736] [2021-12-07 00:56:59,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1670386736] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:56:59,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1745392920] [2021-12-07 00:56:59,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:56:59,416 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:56:59,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:56:59,416 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:56:59,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-12-07 00:56:59,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 00:56:59,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896941793] [2021-12-07 00:56:59,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:56:59,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:56:59,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:56:59,698 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:56:59,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-12-07 00:56:59,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 1 [2021-12-07 00:57:00,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-07 00:57:00,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:57:00,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-07 00:57:00,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:57:00,548 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 [2021-12-07 00:57:09,071 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-12-07 00:57:09,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 33 [2021-12-07 00:57:09,095 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-07 00:57:09,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:57:09,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896941793] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:57:09,507 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:57:09,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-12-07 00:57:09,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739785000] [2021-12-07 00:57:09,507 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:57:09,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-07 00:57:09,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:57:09,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-07 00:57:09,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=140, Unknown=7, NotChecked=0, Total=210 [2021-12-07 00:57:09,508 INFO L87 Difference]: Start difference. First operand 393 states and 564 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 6 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-07 00:57:28,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:57:28,822 INFO L93 Difference]: Finished difference Result 424 states and 617 transitions. [2021-12-07 00:57:28,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 00:57:28,823 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 6 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) Word has length 39 [2021-12-07 00:57:28,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:57:28,825 INFO L225 Difference]: With dead ends: 424 [2021-12-07 00:57:28,825 INFO L226 Difference]: Without dead ends: 424 [2021-12-07 00:57:28,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 60 SyntacticMatches, 15 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 42.0s TimeCoverageRelationStatistics Valid=101, Invalid=195, Unknown=10, NotChecked=0, Total=306 [2021-12-07 00:57:28,826 INFO L933 BasicCegarLoop]: 193 mSDtfsCounter, 10 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 627 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 613 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-07 00:57:28,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 627 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 613 Unchecked, 0.0s Time] [2021-12-07 00:57:28,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-12-07 00:57:28,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 424. [2021-12-07 00:57:28,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 272 states have (on average 1.3051470588235294) internal successors, (355), 329 states have internal predecessors, (355), 59 states have call successors, (59), 23 states have call predecessors, (59), 42 states have return successors, (203), 71 states have call predecessors, (203), 59 states have call successors, (203) [2021-12-07 00:57:28,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 617 transitions. [2021-12-07 00:57:28,838 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 617 transitions. Word has length 39 [2021-12-07 00:57:28,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:57:28,838 INFO L470 AbstractCegarLoop]: Abstraction has 424 states and 617 transitions. [2021-12-07 00:57:28,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 10 states have internal predecessors, (35), 6 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-12-07 00:57:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 617 transitions. [2021-12-07 00:57:28,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-07 00:57:28,839 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:57:28,839 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-12-07 00:57:28,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-12-07 00:57:29,093 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-12-07 00:57:29,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:57:29,240 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:57:29,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:57:29,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1734674139, now seen corresponding path program 3 times [2021-12-07 00:57:29,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:57:29,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2048051213] [2021-12-07 00:57:29,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:57:29,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:57:29,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:57:29,246 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:57:29,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-12-07 00:57:29,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-07 00:57:29,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:57:29,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-07 00:57:29,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:57:29,655 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 [2021-12-07 00:57:29,661 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 [2021-12-07 00:57:36,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:57:36,081 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:57:36,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:57:36,095 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:57:36,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:57:36,161 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-07 00:57:36,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:57:42,892 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:57:42,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2048051213] [2021-12-07 00:57:42,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2048051213] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:57:42,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1384536819] [2021-12-07 00:57:42,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:57:42,892 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:57:42,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:57:42,893 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:57:42,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-12-07 00:57:43,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-07 00:57:43,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:57:43,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-07 00:57:43,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:57:43,254 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 [2021-12-07 00:57:43,264 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 [2021-12-07 00:57:53,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:57:53,728 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:57:53,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:57:53,746 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:57:53,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-12-07 00:57:53,765 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-12-07 00:57:53,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:57:57,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1384536819] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:57:57,051 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:57:57,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 11 [2021-12-07 00:57:57,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411414183] [2021-12-07 00:57:57,051 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:57:57,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-07 00:57:57,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:57:57,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-07 00:57:57,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=143, Unknown=6, NotChecked=0, Total=182 [2021-12-07 00:57:57,052 INFO L87 Difference]: Start difference. First operand 424 states and 617 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:58:09,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:58:09,070 INFO L93 Difference]: Finished difference Result 464 states and 740 transitions. [2021-12-07 00:58:09,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-07 00:58:09,071 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 39 [2021-12-07 00:58:09,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:58:09,074 INFO L225 Difference]: With dead ends: 464 [2021-12-07 00:58:09,075 INFO L226 Difference]: Without dead ends: 464 [2021-12-07 00:58:09,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=73, Invalid=258, Unknown=11, NotChecked=0, Total=342 [2021-12-07 00:58:09,075 INFO L933 BasicCegarLoop]: 146 mSDtfsCounter, 185 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 493 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 551 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-12-07 00:58:09,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 493 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 736 Invalid, 0 Unknown, 551 Unchecked, 1.4s Time] [2021-12-07 00:58:09,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-12-07 00:58:09,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 457. [2021-12-07 00:58:09,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 296 states have (on average 1.277027027027027) internal successors, (378), 353 states have internal predecessors, (378), 62 states have call successors, (62), 23 states have call predecessors, (62), 48 states have return successors, (229), 80 states have call predecessors, (229), 62 states have call successors, (229) [2021-12-07 00:58:09,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 669 transitions. [2021-12-07 00:58:09,099 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 669 transitions. Word has length 39 [2021-12-07 00:58:09,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:58:09,099 INFO L470 AbstractCegarLoop]: Abstraction has 457 states and 669 transitions. [2021-12-07 00:58:09,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-07 00:58:09,099 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 669 transitions. [2021-12-07 00:58:09,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:58:09,101 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:58:09,101 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:58:09,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-12-07 00:58:09,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-12-07 00:58:09,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:58:09,502 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:58:09,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:58:09,502 INFO L85 PathProgramCache]: Analyzing trace with hash 986694742, now seen corresponding path program 4 times [2021-12-07 00:58:09,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:58:09,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [209504696] [2021-12-07 00:58:09,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:58:09,505 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:58:09,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:58:09,506 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:58:09,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-12-07 00:58:09,737 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:58:09,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:58:09,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-07 00:58:09,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:58:09,757 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 [2021-12-07 00:58:09,765 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 6 treesize of output 5 [2021-12-07 00:58:14,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:14,141 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:58:14,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:58:14,156 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:14,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:58:14,255 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-07 00:58:14,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:58:19,623 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:58:19,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [209504696] [2021-12-07 00:58:19,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [209504696] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:58:19,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [259877872] [2021-12-07 00:58:19,623 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:58:19,624 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:58:19,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:58:19,624 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:58:19,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-12-07 00:58:19,942 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:58:19,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:58:19,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-07 00:58:19,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:58:19,957 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 [2021-12-07 00:58:19,962 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 [2021-12-07 00:58:24,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:24,275 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 00:58:24,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-12-07 00:58:24,291 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:24,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 00:58:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-07 00:58:24,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:58:27,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [259877872] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:58:27,318 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:58:27,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-12-07 00:58:27,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618528545] [2021-12-07 00:58:27,319 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:58:27,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-07 00:58:27,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:58:27,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-07 00:58:27,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=140, Unknown=5, NotChecked=0, Total=182 [2021-12-07 00:58:27,319 INFO L87 Difference]: Start difference. First operand 457 states and 669 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-07 00:58:32,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:58:32,229 INFO L93 Difference]: Finished difference Result 525 states and 798 transitions. [2021-12-07 00:58:32,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 00:58:32,230 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2021-12-07 00:58:32,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:58:32,232 INFO L225 Difference]: With dead ends: 525 [2021-12-07 00:58:32,232 INFO L226 Difference]: Without dead ends: 525 [2021-12-07 00:58:32,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=57, Invalid=176, Unknown=7, NotChecked=0, Total=240 [2021-12-07 00:58:32,233 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 90 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 492 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:58:32,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 454 Invalid, 922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 402 Invalid, 0 Unknown, 492 Unchecked, 0.8s Time] [2021-12-07 00:58:32,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-12-07 00:58:32,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 524. [2021-12-07 00:58:32,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 342 states have (on average 1.2543859649122806) internal successors, (429), 405 states have internal predecessors, (429), 73 states have call successors, (73), 28 states have call predecessors, (73), 58 states have return successors, (295), 90 states have call predecessors, (295), 73 states have call successors, (295) [2021-12-07 00:58:32,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 797 transitions. [2021-12-07 00:58:32,251 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 797 transitions. Word has length 45 [2021-12-07 00:58:32,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:58:32,251 INFO L470 AbstractCegarLoop]: Abstraction has 524 states and 797 transitions. [2021-12-07 00:58:32,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-07 00:58:32,251 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 797 transitions. [2021-12-07 00:58:32,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:58:32,252 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:58:32,253 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:58:32,262 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-12-07 00:58:32,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-12-07 00:58:32,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 00:58:32,654 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:58:32,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:58:32,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1592442388, now seen corresponding path program 2 times [2021-12-07 00:58:32,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:58:32,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1109232932] [2021-12-07 00:58:32,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:58:32,658 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:58:32,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:58:32,659 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:58:32,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-12-07 00:58:32,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:58:32,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:58:32,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 59 conjunts are in the unsatisfiable core [2021-12-07 00:58:32,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:58:32,894 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 [2021-12-07 00:58:33,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:58:33,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:58:33,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:33,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-07 00:58:33,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:33,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-07 00:58:33,421 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:33,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:58:33,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:33,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:58:33,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:33,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:58:33,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:58:33,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:58:34,011 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 32 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:58:34,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:58:35,873 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_275 (_ BitVec 32))) (or (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_275)))) (and (forall ((v_ArrVal_3214 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.base| v_nondet_tree_~n~0.base_275 v_ArrVal_3214) c_nondet_tree_~n~0.base) (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset)) (_ bv0 32))) (forall ((v_ArrVal_3213 (Array (_ BitVec 32) (_ BitVec 32)))) (= (select (select (store |c_#memory_$Pointer$.offset| v_nondet_tree_~n~0.base_275 v_ArrVal_3213) c_nondet_tree_~n~0.base) (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset)) (_ bv0 32)))))) is different from false [2021-12-07 00:58:35,876 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:58:35,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1109232932] [2021-12-07 00:58:35,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1109232932] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:58:35,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [872272993] [2021-12-07 00:58:35,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-07 00:58:35,877 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:58:35,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:58:35,877 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:58:35,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-12-07 00:58:36,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-07 00:58:36,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:58:36,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 60 conjunts are in the unsatisfiable core [2021-12-07 00:58:36,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:58:36,198 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 6 treesize of output 5 [2021-12-07 00:58:36,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:58:36,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:58:36,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:36,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-07 00:58:36,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:36,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-07 00:58:36,602 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:36,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 00:58:36,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:36,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:58:36,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:36,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:58:36,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:58:36,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-07 00:58:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 32 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-07 00:58:36,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:58:38,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [872272993] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:58:38,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:58:38,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2021-12-07 00:58:38,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803473754] [2021-12-07 00:58:38,322 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:58:38,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-07 00:58:38,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:58:38,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-07 00:58:38,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=673, Unknown=16, NotChecked=52, Total=812 [2021-12-07 00:58:38,323 INFO L87 Difference]: Start difference. First operand 524 states and 797 transitions. Second operand has 21 states, 19 states have (on average 1.631578947368421) internal successors, (31), 15 states have internal predecessors, (31), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-07 00:58:41,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:58:41,951 INFO L93 Difference]: Finished difference Result 572 states and 863 transitions. [2021-12-07 00:58:41,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-07 00:58:41,951 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.631578947368421) internal successors, (31), 15 states have internal predecessors, (31), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 45 [2021-12-07 00:58:41,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:58:41,954 INFO L225 Difference]: With dead ends: 572 [2021-12-07 00:58:41,954 INFO L226 Difference]: Without dead ends: 572 [2021-12-07 00:58:41,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 91 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=169, Invalid=1452, Unknown=23, NotChecked=78, Total=1722 [2021-12-07 00:58:41,955 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 210 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 1625 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1507 SdHoareTripleChecker+Invalid, 2110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 1625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 399 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-07 00:58:41,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 1507 Invalid, 2110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 1625 Invalid, 0 Unknown, 399 Unchecked, 2.8s Time] [2021-12-07 00:58:41,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-12-07 00:58:41,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 544. [2021-12-07 00:58:41,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 544 states, 357 states have (on average 1.2492997198879552) internal successors, (446), 420 states have internal predecessors, (446), 76 states have call successors, (76), 30 states have call predecessors, (76), 60 states have return successors, (298), 93 states have call predecessors, (298), 76 states have call successors, (298) [2021-12-07 00:58:41,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 820 transitions. [2021-12-07 00:58:41,971 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 820 transitions. Word has length 45 [2021-12-07 00:58:41,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:58:41,972 INFO L470 AbstractCegarLoop]: Abstraction has 544 states and 820 transitions. [2021-12-07 00:58:41,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.631578947368421) internal successors, (31), 15 states have internal predecessors, (31), 6 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-07 00:58:41,972 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 820 transitions. [2021-12-07 00:58:41,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-12-07 00:58:41,974 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:58:41,974 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-12-07 00:58:41,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-12-07 00:58:42,186 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-12-07 00:58:42,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:58:42,375 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:58:42,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:58:42,377 INFO L85 PathProgramCache]: Analyzing trace with hash 213962118, now seen corresponding path program 5 times [2021-12-07 00:58:42,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:58:42,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1642981943] [2021-12-07 00:58:42,379 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:58:42,379 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:58:42,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:58:42,380 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:58:42,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-12-07 00:58:42,908 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-07 00:58:42,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:58:42,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-07 00:58:42,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:58:42,941 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 [2021-12-07 00:58:42,948 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 [2021-12-07 00:58:47,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:47,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:58:47,231 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:47,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:58:51,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:58:51,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:58:51,500 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:58:51,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-12-07 00:58:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-12-07 00:58:51,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:58:53,818 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:58:53,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1642981943] [2021-12-07 00:58:53,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1642981943] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:58:53,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [860216579] [2021-12-07 00:58:53,819 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:58:53,819 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 00:58:53,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 00:58:53,819 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 00:58:53,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-12-07 00:58:54,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 00:58:54,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019902703] [2021-12-07 00:58:54,158 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-07 00:58:54,158 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:58:54,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 00:58:54,159 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 00:58:54,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-12-07 00:58:54,162 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (48)] Ended with exit code 1 [2021-12-07 00:59:02,236 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-07 00:59:02,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:59:02,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 27 conjunts are in the unsatisfiable core [2021-12-07 00:59:02,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:59:02,260 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 [2021-12-07 00:59:02,265 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 [2021-12-07 00:59:06,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:59:06,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:59:06,517 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:59:06,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:59:12,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:59:12,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 00:59:12,785 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 00:59:12,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-07 00:59:12,793 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-12-07 00:59:12,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:59:12,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019902703] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 00:59:12,991 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:59:12,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-07 00:59:12,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321858193] [2021-12-07 00:59:12,991 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:59:12,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-07 00:59:12,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:59:12,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-07 00:59:12,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-07 00:59:12,992 INFO L87 Difference]: Start difference. First operand 544 states and 820 transitions. Second operand has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:59:13,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:59:13,958 INFO L93 Difference]: Finished difference Result 549 states and 868 transitions. [2021-12-07 00:59:13,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-07 00:59:13,959 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-12-07 00:59:13,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:59:13,962 INFO L225 Difference]: With dead ends: 549 [2021-12-07 00:59:13,962 INFO L226 Difference]: Without dead ends: 549 [2021-12-07 00:59:13,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 88 SyntacticMatches, 14 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-07 00:59:13,962 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 95 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 178 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-07 00:59:13,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 355 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 438 Invalid, 0 Unknown, 178 Unchecked, 0.9s Time] [2021-12-07 00:59:13,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-12-07 00:59:13,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 544. [2021-12-07 00:59:13,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 544 states, 357 states have (on average 1.2492997198879552) internal successors, (446), 420 states have internal predecessors, (446), 76 states have call successors, (76), 30 states have call predecessors, (76), 60 states have return successors, (298), 93 states have call predecessors, (298), 76 states have call successors, (298) [2021-12-07 00:59:13,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 820 transitions. [2021-12-07 00:59:13,981 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 820 transitions. Word has length 53 [2021-12-07 00:59:13,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:59:13,981 INFO L470 AbstractCegarLoop]: Abstraction has 544 states and 820 transitions. [2021-12-07 00:59:13,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-07 00:59:13,982 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 820 transitions. [2021-12-07 00:59:13,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:59:13,983 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:59:13,984 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:59:13,994 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-12-07 00:59:14,245 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-12-07 00:59:14,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 00:59:14,385 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:59:14,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:59:14,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1134522260, now seen corresponding path program 3 times [2021-12-07 00:59:14,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:59:14,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1201541313] [2021-12-07 00:59:14,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-07 00:59:14,388 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:59:14,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:59:14,391 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:59:14,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-12-07 00:59:14,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-07 00:59:14,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:59:14,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-07 00:59:14,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:59:14,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:59:14,780 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-07 00:59:14,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2021-12-07 00:59:14,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 22 [2021-12-07 00:59:15,093 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 22 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-07 00:59:15,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:59:15,992 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-07 00:59:15,993 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:59:15,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1201541313] [2021-12-07 00:59:15,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1201541313] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:59:15,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:59:15,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 17 [2021-12-07 00:59:15,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112203665] [2021-12-07 00:59:15,993 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:59:15,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-07 00:59:15,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:59:15,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-07 00:59:15,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-12-07 00:59:15,994 INFO L87 Difference]: Start difference. First operand 544 states and 820 transitions. Second operand has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-07 00:59:20,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:59:20,688 INFO L93 Difference]: Finished difference Result 590 states and 885 transitions. [2021-12-07 00:59:20,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-07 00:59:20,689 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 45 [2021-12-07 00:59:20,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:59:20,692 INFO L225 Difference]: With dead ends: 590 [2021-12-07 00:59:20,692 INFO L226 Difference]: Without dead ends: 590 [2021-12-07 00:59:20,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 57 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2021-12-07 00:59:20,693 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 144 mSDsluCounter, 1087 mSDsCounter, 0 mSdLazyCounter, 2305 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 1284 SdHoareTripleChecker+Invalid, 2531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 2305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-12-07 00:59:20,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 1284 Invalid, 2531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 2305 Invalid, 0 Unknown, 166 Unchecked, 4.2s Time] [2021-12-07 00:59:20,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-12-07 00:59:20,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 558. [2021-12-07 00:59:20,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 558 states, 368 states have (on average 1.2581521739130435) internal successors, (463), 431 states have internal predecessors, (463), 78 states have call successors, (78), 31 states have call predecessors, (78), 61 states have return successors, (300), 95 states have call predecessors, (300), 78 states have call successors, (300) [2021-12-07 00:59:20,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 558 states to 558 states and 841 transitions. [2021-12-07 00:59:20,707 INFO L78 Accepts]: Start accepts. Automaton has 558 states and 841 transitions. Word has length 45 [2021-12-07 00:59:20,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:59:20,707 INFO L470 AbstractCegarLoop]: Abstraction has 558 states and 841 transitions. [2021-12-07 00:59:20,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 5 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-12-07 00:59:20,708 INFO L276 IsEmpty]: Start isEmpty. Operand 558 states and 841 transitions. [2021-12-07 00:59:20,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-07 00:59:20,709 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:59:20,709 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 00:59:20,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (50)] Ended with exit code 0 [2021-12-07 00:59:20,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:59:20,910 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:59:20,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:59:20,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1134522261, now seen corresponding path program 1 times [2021-12-07 00:59:20,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:59:20,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1056347664] [2021-12-07 00:59:20,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 00:59:20,913 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:59:20,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:59:20,915 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:59:20,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-12-07 00:59:21,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 00:59:21,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 46 conjunts are in the unsatisfiable core [2021-12-07 00:59:21,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:59:21,165 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 6 treesize of output 5 [2021-12-07 00:59:21,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:59:21,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 13 treesize of output 9 [2021-12-07 00:59:21,406 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-07 00:59:21,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-07 00:59:21,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 00:59:21,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-07 00:59:21,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-07 00:59:21,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2021-12-07 00:59:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-07 00:59:21,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 00:59:30,275 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-07 00:59:30,275 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 00:59:30,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1056347664] [2021-12-07 00:59:30,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1056347664] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 00:59:30,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 00:59:30,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 29 [2021-12-07 00:59:30,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216453472] [2021-12-07 00:59:30,275 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 00:59:30,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-07 00:59:30,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 00:59:30,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-07 00:59:30,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=797, Unknown=0, NotChecked=0, Total=870 [2021-12-07 00:59:30,276 INFO L87 Difference]: Start difference. First operand 558 states and 841 transitions. Second operand has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-07 00:59:43,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 00:59:43,025 INFO L93 Difference]: Finished difference Result 611 states and 915 transitions. [2021-12-07 00:59:43,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-07 00:59:43,027 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) Word has length 45 [2021-12-07 00:59:43,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 00:59:43,030 INFO L225 Difference]: With dead ends: 611 [2021-12-07 00:59:43,030 INFO L226 Difference]: Without dead ends: 611 [2021-12-07 00:59:43,030 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=179, Invalid=1543, Unknown=0, NotChecked=0, Total=1722 [2021-12-07 00:59:43,031 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 315 mSDsluCounter, 1011 mSDsCounter, 0 mSdLazyCounter, 3040 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 1197 SdHoareTripleChecker+Invalid, 3302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 3040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 169 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2021-12-07 00:59:43,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [319 Valid, 1197 Invalid, 3302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 3040 Invalid, 0 Unknown, 169 Unchecked, 11.1s Time] [2021-12-07 00:59:43,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-12-07 00:59:43,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 591. [2021-12-07 00:59:43,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 591 states, 393 states have (on average 1.256997455470738) internal successors, (494), 456 states have internal predecessors, (494), 83 states have call successors, (83), 34 states have call predecessors, (83), 64 states have return successors, (305), 100 states have call predecessors, (305), 83 states have call successors, (305) [2021-12-07 00:59:43,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 591 states to 591 states and 882 transitions. [2021-12-07 00:59:43,045 INFO L78 Accepts]: Start accepts. Automaton has 591 states and 882 transitions. Word has length 45 [2021-12-07 00:59:43,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 00:59:43,045 INFO L470 AbstractCegarLoop]: Abstraction has 591 states and 882 transitions. [2021-12-07 00:59:43,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 25 states have (on average 2.28) internal successors, (57), 22 states have internal predecessors, (57), 9 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 8 states have call predecessors, (10), 5 states have call successors, (10) [2021-12-07 00:59:43,045 INFO L276 IsEmpty]: Start isEmpty. Operand 591 states and 882 transitions. [2021-12-07 00:59:43,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-07 00:59:43,047 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 00:59:43,047 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-12-07 00:59:43,057 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-12-07 00:59:43,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 00:59:43,248 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 00:59:43,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 00:59:43,249 INFO L85 PathProgramCache]: Analyzing trace with hash -922090168, now seen corresponding path program 4 times [2021-12-07 00:59:43,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 00:59:43,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1202214104] [2021-12-07 00:59:43,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 00:59:43,251 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 00:59:43,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 00:59:43,252 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 00:59:43,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-12-07 00:59:43,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 00:59:43,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 00:59:43,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-07 00:59:43,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 00:59:43,648 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 [2021-12-07 00:59:58,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 00:59:58,922 INFO L354 Elim1Store]: treesize reduction 67, result has 37.4 percent of original size [2021-12-07 00:59:58,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 30 treesize of output 58 [2021-12-07 00:59:59,557 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 45 proven. 63 refuted. 3 times theorem prover too weak. 39 trivial. 0 not checked. [2021-12-07 00:59:59,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:00:06,115 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:00:06,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1202214104] [2021-12-07 01:00:06,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1202214104] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:00:06,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1127309517] [2021-12-07 01:00:06,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 01:00:06,115 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 01:00:06,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 01:00:06,116 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 01:00:06,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-12-07 01:00:06,653 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 01:00:06,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:00:06,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-07 01:00:06,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:00:06,676 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 [2021-12-07 01:00:34,385 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 01:00:34,466 INFO L354 Elim1Store]: treesize reduction 60, result has 43.9 percent of original size [2021-12-07 01:00:34,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 46 treesize of output 81 [2021-12-07 01:00:35,010 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 45 proven. 63 refuted. 3 times theorem prover too weak. 39 trivial. 0 not checked. [2021-12-07 01:00:35,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:00:35,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1127309517] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:00:35,348 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:00:35,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-12-07 01:00:35,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726106866] [2021-12-07 01:00:35,348 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:00:35,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-07 01:00:35,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:00:35,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-07 01:00:35,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=152, Unknown=15, NotChecked=0, Total=210 [2021-12-07 01:00:35,349 INFO L87 Difference]: Start difference. First operand 591 states and 882 transitions. Second operand has 13 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 9 states have call successors, (11), 2 states have call predecessors, (11), 6 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-07 01:01:01,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:01:01,347 INFO L93 Difference]: Finished difference Result 597 states and 931 transitions. [2021-12-07 01:01:01,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 01:01:01,348 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 9 states have call successors, (11), 2 states have call predecessors, (11), 6 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) Word has length 61 [2021-12-07 01:01:01,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:01:01,351 INFO L225 Difference]: With dead ends: 597 [2021-12-07 01:01:01,351 INFO L226 Difference]: Without dead ends: 597 [2021-12-07 01:01:01,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 106 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 73.2s TimeCoverageRelationStatistics Valid=88, Invalid=237, Unknown=17, NotChecked=0, Total=342 [2021-12-07 01:01:01,352 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 94 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 1153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 941 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 01:01:01,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 633 Invalid, 1153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 191 Invalid, 0 Unknown, 941 Unchecked, 0.4s Time] [2021-12-07 01:01:01,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-12-07 01:01:01,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 596. [2021-12-07 01:01:01,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 596 states, 397 states have (on average 1.256926952141058) internal successors, (499), 459 states have internal predecessors, (499), 83 states have call successors, (83), 34 states have call predecessors, (83), 65 states have return successors, (349), 102 states have call predecessors, (349), 83 states have call successors, (349) [2021-12-07 01:01:01,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 596 states to 596 states and 931 transitions. [2021-12-07 01:01:01,367 INFO L78 Accepts]: Start accepts. Automaton has 596 states and 931 transitions. Word has length 61 [2021-12-07 01:01:01,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:01:01,367 INFO L470 AbstractCegarLoop]: Abstraction has 596 states and 931 transitions. [2021-12-07 01:01:01,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 9 states have call successors, (11), 2 states have call predecessors, (11), 6 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2021-12-07 01:01:01,367 INFO L276 IsEmpty]: Start isEmpty. Operand 596 states and 931 transitions. [2021-12-07 01:01:01,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-07 01:01:01,369 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:01:01,369 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-12-07 01:01:01,375 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (53)] Ended with exit code 0 [2021-12-07 01:01:01,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (52)] Ended with exit code 0 [2021-12-07 01:01:01,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 01:01:01,770 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:01:01,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:01:01,772 INFO L85 PathProgramCache]: Analyzing trace with hash -922090167, now seen corresponding path program 4 times [2021-12-07 01:01:01,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:01:01,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [56927004] [2021-12-07 01:01:01,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 01:01:01,774 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:01:01,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:01:01,776 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:01:01,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-12-07 01:01:02,219 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 01:01:02,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:01:02,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-07 01:01:02,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:01:02,256 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 [2021-12-07 01:01:02,264 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 [2021-12-07 01:01:15,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:01:15,612 INFO L354 Elim1Store]: treesize reduction 59, result has 34.4 percent of original size [2021-12-07 01:01:15,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 39 [2021-12-07 01:01:15,635 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 01:01:15,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-12-07 01:01:18,326 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 45 proven. 71 refuted. 1 times theorem prover too weak. 33 trivial. 0 not checked. [2021-12-07 01:01:18,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:01:20,859 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_nondet_tree_~n~0.base_386 (_ BitVec 32)) (v_nondet_tree_~n~0.base_384 (_ BitVec 32)) (v_nondet_tree_~n~0.base_385 (_ BitVec 32)) (v_ArrVal_4291 (_ BitVec 32)) (v_ArrVal_4290 (_ BitVec 32))) (let ((.cse0 (store (store (store |c_#length| v_nondet_tree_~n~0.base_386 v_ArrVal_4291) v_nondet_tree_~n~0.base_384 v_ArrVal_4290) v_nondet_tree_~n~0.base_385 (_ bv12 32)))) (or (not (bvule (_ bv8 32) (select .cse0 v_nondet_tree_~n~0.base_384))) (let ((.cse1 (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset))) (and (bvule .cse1 (select .cse0 c_nondet_tree_~n~0.base)) (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) .cse1))) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_386))))))) is different from false [2021-12-07 01:01:20,864 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:01:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [56927004] [2021-12-07 01:01:20,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [56927004] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:01:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [377787234] [2021-12-07 01:01:20,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 01:01:20,865 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 01:01:20,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 01:01:20,866 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 01:01:20,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-12-07 01:01:21,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 01:01:21,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:01:21,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 31 conjunts are in the unsatisfiable core [2021-12-07 01:01:21,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:01:21,461 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 [2021-12-07 01:01:21,469 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 [2021-12-07 01:01:36,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:01:36,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:01:36,795 INFO L354 Elim1Store]: treesize reduction 47, result has 36.5 percent of original size [2021-12-07 01:01:36,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 35 [2021-12-07 01:01:36,840 INFO L354 Elim1Store]: treesize reduction 10, result has 60.0 percent of original size [2021-12-07 01:01:36,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 52 [2021-12-07 01:01:37,041 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-07 01:01:37,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:01:39,541 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_4448 (_ BitVec 1)) (v_nondet_tree_~n~0.base_405 (_ BitVec 32)) (v_nondet_tree_~n~0.base_406 (_ BitVec 32))) (or (not (= (_ bv0 1) (bvneg (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_405))))) (and (bvule (bvadd (_ bv4 32) c_nondet_tree_~n~0.offset) (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset)) (forall ((v_nondet_tree_~n~0.base_407 (_ BitVec 32)) (v_ArrVal_4446 (_ BitVec 32)) (v_ArrVal_4447 (_ BitVec 32))) (bvule (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset) (select (store (store (store |c_#length| v_nondet_tree_~n~0.base_405 v_ArrVal_4446) v_nondet_tree_~n~0.base_406 v_ArrVal_4447) v_nondet_tree_~n~0.base_407 (_ bv12 32)) c_nondet_tree_~n~0.base)))) (not (= (_ bv0 1) (bvneg (bvneg (bvneg (select (store |c_#valid| v_nondet_tree_~n~0.base_405 v_ArrVal_4448) v_nondet_tree_~n~0.base_406)))))))) is different from false [2021-12-07 01:01:39,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [377787234] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:01:39,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:01:39,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2021-12-07 01:01:39,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258996834] [2021-12-07 01:01:39,548 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:01:39,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-07 01:01:39,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:01:39,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-07 01:01:39,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=223, Unknown=13, NotChecked=62, Total=342 [2021-12-07 01:01:39,549 INFO L87 Difference]: Start difference. First operand 596 states and 931 transitions. Second operand has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 12 states have internal predecessors, (49), 10 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-07 01:02:38,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:02:38,177 INFO L93 Difference]: Finished difference Result 603 states and 943 transitions. [2021-12-07 01:02:38,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-07 01:02:38,178 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 12 states have internal predecessors, (49), 10 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) Word has length 61 [2021-12-07 01:02:38,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:02:38,181 INFO L225 Difference]: With dead ends: 603 [2021-12-07 01:02:38,181 INFO L226 Difference]: Without dead ends: 603 [2021-12-07 01:02:38,181 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 105 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 92.2s TimeCoverageRelationStatistics Valid=88, Invalid=395, Unknown=31, NotChecked=86, Total=600 [2021-12-07 01:02:38,181 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 173 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 1499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1232 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-07 01:02:38,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 603 Invalid, 1499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 216 Invalid, 0 Unknown, 1232 Unchecked, 0.6s Time] [2021-12-07 01:02:38,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-12-07 01:02:38,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 603. [2021-12-07 01:02:38,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 402 states have (on average 1.2512437810945274) internal successors, (503), 464 states have internal predecessors, (503), 84 states have call successors, (84), 34 states have call predecessors, (84), 66 states have return successors, (356), 104 states have call predecessors, (356), 84 states have call successors, (356) [2021-12-07 01:02:38,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 943 transitions. [2021-12-07 01:02:38,199 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 943 transitions. Word has length 61 [2021-12-07 01:02:38,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:02:38,200 INFO L470 AbstractCegarLoop]: Abstraction has 603 states and 943 transitions. [2021-12-07 01:02:38,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 12 states have internal predecessors, (49), 10 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (12), 8 states have call predecessors, (12), 9 states have call successors, (12) [2021-12-07 01:02:38,200 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 943 transitions. [2021-12-07 01:02:38,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-07 01:02:38,201 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:02:38,201 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 01:02:38,216 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-12-07 01:02:38,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-12-07 01:02:38,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 01:02:38,603 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:02:38,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:02:38,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1888405033, now seen corresponding path program 1 times [2021-12-07 01:02:38,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:02:38,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [841385149] [2021-12-07 01:02:38,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 01:02:38,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:02:38,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:02:38,608 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:02:38,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-12-07 01:02:38,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 01:02:38,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-07 01:02:38,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:02:38,820 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 [2021-12-07 01:02:39,061 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-07 01:02:39,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 31 [2021-12-07 01:02:39,145 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-07 01:02:39,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:02:39,509 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-07 01:02:39,509 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:02:39,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [841385149] [2021-12-07 01:02:39,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [841385149] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-07 01:02:39,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:02:39,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-12-07 01:02:39,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994436713] [2021-12-07 01:02:39,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:02:39,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-07 01:02:39,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:02:39,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-07 01:02:39,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-12-07 01:02:39,511 INFO L87 Difference]: Start difference. First operand 603 states and 943 transitions. Second operand has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-07 01:02:39,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:02:39,985 INFO L93 Difference]: Finished difference Result 616 states and 958 transitions. [2021-12-07 01:02:39,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-07 01:02:39,986 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) Word has length 48 [2021-12-07 01:02:39,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:02:39,989 INFO L225 Difference]: With dead ends: 616 [2021-12-07 01:02:39,989 INFO L226 Difference]: Without dead ends: 614 [2021-12-07 01:02:39,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 72 SyntacticMatches, 13 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-12-07 01:02:39,990 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 116 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 246 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 01:02:39,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 375 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 159 Invalid, 0 Unknown, 246 Unchecked, 0.4s Time] [2021-12-07 01:02:39,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-12-07 01:02:40,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 612. [2021-12-07 01:02:40,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 409 states have (on average 1.2493887530562346) internal successors, (511), 470 states have internal predecessors, (511), 85 states have call successors, (85), 36 states have call predecessors, (85), 67 states have return successors, (357), 105 states have call predecessors, (357), 85 states have call successors, (357) [2021-12-07 01:02:40,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 953 transitions. [2021-12-07 01:02:40,006 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 953 transitions. Word has length 48 [2021-12-07 01:02:40,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:02:40,006 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 953 transitions. [2021-12-07 01:02:40,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 9 states have internal predecessors, (41), 4 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2021-12-07 01:02:40,006 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 953 transitions. [2021-12-07 01:02:40,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-07 01:02:40,008 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:02:40,008 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-07 01:02:40,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-12-07 01:02:40,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 01:02:40,209 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting sizeErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:02:40,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:02:40,210 INFO L85 PathProgramCache]: Analyzing trace with hash -1888405032, now seen corresponding path program 1 times [2021-12-07 01:02:40,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:02:40,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2114998468] [2021-12-07 01:02:40,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 01:02:40,212 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:02:40,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:02:40,214 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:02:40,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-12-07 01:02:40,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 01:02:40,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-07 01:02:40,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:02:40,442 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 [2021-12-07 01:02:40,451 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 [2021-12-07 01:02:40,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:02:40,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 01:02:40,958 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 01:02:40,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 24 [2021-12-07 01:02:41,067 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-07 01:02:41,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:02:41,592 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:02:41,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2114998468] [2021-12-07 01:02:41,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2114998468] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:02:41,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1995489243] [2021-12-07 01:02:41,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-07 01:02:41,592 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 01:02:41,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 01:02:41,593 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 01:02:41,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-12-07 01:02:41,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 01:02:41,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-07 01:02:41,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:02:41,929 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 [2021-12-07 01:02:42,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 01:02:42,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-12-07 01:02:42,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:02:42,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-07 01:02:43,084 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-07 01:02:43,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:02:43,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1995489243] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:02:43,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:02:43,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 19 [2021-12-07 01:02:43,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788567725] [2021-12-07 01:02:43,737 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:02:43,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-07 01:02:43,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:02:43,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-07 01:02:43,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2021-12-07 01:02:43,738 INFO L87 Difference]: Start difference. First operand 612 states and 953 transitions. Second operand has 20 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 9 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2021-12-07 01:02:47,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:02:47,553 INFO L93 Difference]: Finished difference Result 614 states and 956 transitions. [2021-12-07 01:02:47,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-07 01:02:47,553 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 9 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) Word has length 48 [2021-12-07 01:02:47,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:02:47,556 INFO L225 Difference]: With dead ends: 614 [2021-12-07 01:02:47,556 INFO L226 Difference]: Without dead ends: 614 [2021-12-07 01:02:47,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2021-12-07 01:02:47,557 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 110 mSDsluCounter, 868 mSDsCounter, 0 mSdLazyCounter, 1747 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 1016 SdHoareTripleChecker+Invalid, 2480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 702 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-12-07 01:02:47,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 1016 Invalid, 2480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1747 Invalid, 0 Unknown, 702 Unchecked, 3.2s Time] [2021-12-07 01:02:47,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-12-07 01:02:47,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 612. [2021-12-07 01:02:47,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 612 states, 409 states have (on average 1.2469437652811737) internal successors, (510), 470 states have internal predecessors, (510), 85 states have call successors, (85), 36 states have call predecessors, (85), 67 states have return successors, (357), 105 states have call predecessors, (357), 85 states have call successors, (357) [2021-12-07 01:02:47,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 952 transitions. [2021-12-07 01:02:47,574 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 952 transitions. Word has length 48 [2021-12-07 01:02:47,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:02:47,575 INFO L470 AbstractCegarLoop]: Abstraction has 612 states and 952 transitions. [2021-12-07 01:02:47,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.176470588235294) internal successors, (54), 16 states have internal predecessors, (54), 9 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2021-12-07 01:02:47,575 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 952 transitions. [2021-12-07 01:02:47,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-07 01:02:47,576 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:02:47,576 INFO L514 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2021-12-07 01:02:47,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-12-07 01:02:47,790 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-12-07 01:02:47,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 01:02:47,978 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:02:47,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:02:47,979 INFO L85 PathProgramCache]: Analyzing trace with hash -126673502, now seen corresponding path program 6 times [2021-12-07 01:02:47,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:02:47,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1517984045] [2021-12-07 01:02:47,981 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 01:02:47,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:02:47,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:02:47,982 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:02:47,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-12-07 01:02:48,539 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-07 01:02:48,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:02:48,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-07 01:02:48,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:02:48,575 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 [2021-12-07 01:02:48,583 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 [2021-12-07 01:02:53,133 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 01:02:53,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 01:02:59,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:02:59,671 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-12-07 01:02:59,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 31 [2021-12-07 01:02:59,690 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 01:02:59,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-07 01:02:59,877 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 41 proven. 91 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-07 01:02:59,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:03:00,362 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-12-07 01:03:00,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2021-12-07 01:03:02,648 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_nondet_tree_#res.base_791| (_ BitVec 32)) (|v_nondet_tree_#res.base_793| (_ BitVec 32)) (v_nondet_tree_~n~0.base_423 (_ BitVec 32))) (or (and (forall ((v_ArrVal_4688 (_ BitVec 32))) (bvule (bvadd c_nondet_tree_~n~0.offset (_ bv12 32)) (select (store (store (store |c_#length| v_nondet_tree_~n~0.base_423 v_ArrVal_4688) |v_nondet_tree_#res.base_793| (_ bv12 32)) |v_nondet_tree_#res.base_791| (_ bv12 32)) c_nondet_tree_~n~0.base))) (bvule (bvadd (_ bv8 32) c_nondet_tree_~n~0.offset) (bvadd c_nondet_tree_~n~0.offset (_ bv12 32)))) (= |v_nondet_tree_#res.base_791| |v_nondet_tree_#res.base_793|) (not (= (_ bv0 1) (bvneg (select |c_#valid| v_nondet_tree_~n~0.base_423)))))) is different from false [2021-12-07 01:03:02,655 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:03:02,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1517984045] [2021-12-07 01:03:02,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1517984045] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:03:02,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2084496254] [2021-12-07 01:03:02,655 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 01:03:02,655 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 01:03:02,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 01:03:02,656 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 01:03:02,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-12-07 01:03:03,015 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-07 01:03:03,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444297895] [2021-12-07 01:03:03,016 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-07 01:03:03,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-07 01:03:03,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 [2021-12-07 01:03:03,017 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-07 01:03:03,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-12-07 01:03:03,023 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 1 [2021-12-07 01:03:06,725 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-12-07 01:03:06,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:03:06,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-07 01:03:06,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:03:06,746 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 [2021-12-07 01:03:42,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:03:42,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:03:42,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:03:42,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:03:42,387 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-12-07 01:03:42,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 18 treesize of output 28 [2021-12-07 01:03:42,424 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-12-07 01:03:42,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 39 [2021-12-07 01:03:42,519 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 37 proven. 99 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-07 01:03:42,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:03:53,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444297895] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:03:53,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:03:53,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2021-12-07 01:03:53,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105057452] [2021-12-07 01:03:53,365 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:03:53,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-07 01:03:53,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:03:53,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-07 01:03:53,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=472, Unknown=20, NotChecked=44, Total=600 [2021-12-07 01:03:53,366 INFO L87 Difference]: Start difference. First operand 612 states and 952 transitions. Second operand has 22 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (15), 12 states have call predecessors, (15), 10 states have call successors, (15) [2021-12-07 01:04:47,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:04:47,815 INFO L93 Difference]: Finished difference Result 617 states and 1002 transitions. [2021-12-07 01:04:47,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-07 01:04:47,815 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (15), 12 states have call predecessors, (15), 10 states have call successors, (15) Word has length 63 [2021-12-07 01:04:47,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:04:47,818 INFO L225 Difference]: With dead ends: 617 [2021-12-07 01:04:47,819 INFO L226 Difference]: Without dead ends: 617 [2021-12-07 01:04:47,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 110.7s TimeCoverageRelationStatistics Valid=115, Invalid=784, Unknown=35, NotChecked=58, Total=992 [2021-12-07 01:04:47,819 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 99 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 648 SdHoareTripleChecker+Invalid, 1755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1166 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-07 01:04:47,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 648 Invalid, 1755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 564 Invalid, 0 Unknown, 1166 Unchecked, 1.2s Time] [2021-12-07 01:04:47,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2021-12-07 01:04:47,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 617. [2021-12-07 01:04:47,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 617 states, 413 states have (on average 1.2469733656174333) internal successors, (515), 473 states have internal predecessors, (515), 85 states have call successors, (85), 36 states have call predecessors, (85), 68 states have return successors, (402), 107 states have call predecessors, (402), 85 states have call successors, (402) [2021-12-07 01:04:47,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 617 states to 617 states and 1002 transitions. [2021-12-07 01:04:47,835 INFO L78 Accepts]: Start accepts. Automaton has 617 states and 1002 transitions. Word has length 63 [2021-12-07 01:04:47,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:04:47,835 INFO L470 AbstractCegarLoop]: Abstraction has 617 states and 1002 transitions. [2021-12-07 01:04:47,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.0) internal successors, (63), 20 states have internal predecessors, (63), 11 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (15), 12 states have call predecessors, (15), 10 states have call successors, (15) [2021-12-07 01:04:47,835 INFO L276 IsEmpty]: Start isEmpty. Operand 617 states and 1002 transitions. [2021-12-07 01:04:47,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-12-07 01:04:47,836 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:04:47,836 INFO L514 BasicCegarLoop]: trace histogram [13, 10, 10, 10, 10, 9, 8, 8, 8, 8, 5, 4, 4, 1, 1, 1, 1] [2021-12-07 01:04:47,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-12-07 01:04:48,053 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (59)] Ended with exit code 0 [2021-12-07 01:04:48,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 [2021-12-07 01:04:48,238 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:04:48,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:04:48,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1058286015, now seen corresponding path program 4 times [2021-12-07 01:04:48,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:04:48,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2097298487] [2021-12-07 01:04:48,240 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 01:04:48,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:04:48,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:04:48,241 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:04:48,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-12-07 01:04:49,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 01:04:49,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:04:49,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-07 01:04:49,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:04:49,163 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 [2021-12-07 01:04:58,027 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 01:04:58,103 INFO L354 Elim1Store]: treesize reduction 67, result has 37.4 percent of original size [2021-12-07 01:04:58,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 33 treesize of output 61 [2021-12-07 01:04:58,727 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 295 proven. 75 refuted. 6 times theorem prover too weak. 186 trivial. 0 not checked. [2021-12-07 01:04:58,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:05:01,183 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-07 01:05:01,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2097298487] [2021-12-07 01:05:01,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2097298487] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:05:01,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1144348811] [2021-12-07 01:05:01,183 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-07 01:05:01,183 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-07 01:05:01,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 [2021-12-07 01:05:01,184 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-07 01:05:01,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-12-07 01:05:02,014 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-07 01:05:02,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-07 01:05:02,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-07 01:05:02,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:05:02,077 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 [2021-12-07 01:05:33,344 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-07 01:05:33,436 INFO L354 Elim1Store]: treesize reduction 60, result has 43.9 percent of original size [2021-12-07 01:05:33,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 48 treesize of output 83 [2021-12-07 01:05:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 562 backedges. 295 proven. 75 refuted. 6 times theorem prover too weak. 186 trivial. 0 not checked. [2021-12-07 01:05:34,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-07 01:05:36,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1144348811] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-07 01:05:36,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-07 01:05:36,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-12-07 01:05:36,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668162220] [2021-12-07 01:05:36,724 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-07 01:05:36,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-07 01:05:36,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-07 01:05:36,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-07 01:05:36,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=185, Unknown=20, NotChecked=0, Total=272 [2021-12-07 01:05:36,725 INFO L87 Difference]: Start difference. First operand 617 states and 1002 transitions. Second operand has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 5 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) [2021-12-07 01:06:03,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-07 01:06:03,633 INFO L93 Difference]: Finished difference Result 625 states and 1007 transitions. [2021-12-07 01:06:03,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-07 01:06:03,633 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 5 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) Word has length 111 [2021-12-07 01:06:03,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-07 01:06:03,637 INFO L225 Difference]: With dead ends: 625 [2021-12-07 01:06:03,637 INFO L226 Difference]: Without dead ends: 625 [2021-12-07 01:06:03,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 204 SyntacticMatches, 12 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 69.8s TimeCoverageRelationStatistics Valid=113, Invalid=281, Unknown=26, NotChecked=0, Total=420 [2021-12-07 01:06:03,637 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 92 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 705 SdHoareTripleChecker+Invalid, 1261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1047 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-07 01:06:03,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 705 Invalid, 1261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 193 Invalid, 0 Unknown, 1047 Unchecked, 0.4s Time] [2021-12-07 01:06:03,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-12-07 01:06:03,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 620. [2021-12-07 01:06:03,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 415 states have (on average 1.2433734939759036) internal successors, (516), 476 states have internal predecessors, (516), 85 states have call successors, (85), 36 states have call predecessors, (85), 69 states have return successors, (386), 107 states have call predecessors, (386), 85 states have call successors, (386) [2021-12-07 01:06:03,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 987 transitions. [2021-12-07 01:06:03,654 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 987 transitions. Word has length 111 [2021-12-07 01:06:03,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-07 01:06:03,654 INFO L470 AbstractCegarLoop]: Abstraction has 620 states and 987 transitions. [2021-12-07 01:06:03,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 5 states have call successors, (11), 2 states have call predecessors, (11), 7 states have return successors, (13), 9 states have call predecessors, (13), 5 states have call successors, (13) [2021-12-07 01:06:03,654 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 987 transitions. [2021-12-07 01:06:03,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-12-07 01:06:03,655 INFO L506 BasicCegarLoop]: Found error trace [2021-12-07 01:06:03,655 INFO L514 BasicCegarLoop]: trace histogram [11, 8, 7, 7, 7, 7, 7, 7, 7, 7, 4, 3, 3, 1, 1, 1, 1] [2021-12-07 01:06:03,668 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-12-07 01:06:03,863 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt (63)] Ended with exit code 0 [2021-12-07 01:06:04,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/cvc4 --incremental --print-success --lang smt [2021-12-07 01:06:04,056 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-07 01:06:04,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-07 01:06:04,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1735432036, now seen corresponding path program 7 times [2021-12-07 01:06:04,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-07 01:06:04,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1732373332] [2021-12-07 01:06:04,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-07 01:06:04,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-07 01:06:04,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat [2021-12-07 01:06:04,058 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-07 01:06:04,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46668c32-6376-4594-80be-ee9c7c1f8e34/bin/uautomizer-DrprNOufMa/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-12-07 01:06:04,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-07 01:06:04,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-07 01:06:04,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-07 01:06:04,617 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 [2021-12-07 01:06:04,622 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 [2021-12-07 01:06:11,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-07 01:06:11,266 INFO L354 Elim1Store]: treesize reduction 67, result has 25.6 percent of original size [2021-12-07 01:06:11,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 18 treesize of output 31 [2021-12-07 01:06:11,282 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-07 01:06:11,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-12-07 01:06:11,387 INFO L134 CoverageAnalysis]: Checked inductivity of 350 backedges. 176 proven. 98 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-12-07 01:06:11,387 INFO L328 TraceCheckSpWp]: Computing backward predicates...