./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 e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_del_rec.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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-dev-e19ca92 [2021-12-22 16:23:46,497 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:23:46,499 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:23:46,578 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:23:46,582 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:23:46,583 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:23:46,585 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:23:46,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:23:46,593 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:23:46,594 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:23:46,595 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:23:46,596 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:23:46,597 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:23:46,599 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:23:46,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:23:46,601 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:23:46,603 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:23:46,604 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:23:46,606 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:23:46,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:23:46,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:23:46,616 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:23:46,617 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:23:46,618 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:23:46,621 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:23:46,626 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:23:46,627 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:23:46,628 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:23:46,628 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:23:46,629 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:23:46,630 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:23:46,630 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:23:46,631 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:23:46,632 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:23:46,632 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:23:46,633 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:23:46,633 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:23:46,634 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:23:46,634 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:23:46,635 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:23:46,635 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:23:46,638 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-22 16:23:46,660 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:23:46,660 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:23:46,660 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:23:46,660 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:23:46,661 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:23:46,661 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:23:46,661 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:23:46,661 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:23:46,662 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:23:46,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:23:46,662 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:23:46,662 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:23:46,662 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:23:46,662 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:23:46,663 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:23:46,664 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:23:46,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:23:46,664 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:23:46,664 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:23:46,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:46,664 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:23:46,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:23:46,665 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 16:23:46,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 16:23:46,665 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:23:46,665 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-22 16:23:46,896 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:23:46,920 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:23:46,923 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:23:46,925 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:23:46,925 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:23:46,926 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-22 16:23:46,980 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796126b98/3c1ab53bd575461b8fb765aa684eb9cf/FLAGc92f95a48 [2021-12-22 16:23:47,379 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:23:47,379 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-22 16:23:47,390 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796126b98/3c1ab53bd575461b8fb765aa684eb9cf/FLAGc92f95a48 [2021-12-22 16:23:47,405 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796126b98/3c1ab53bd575461b8fb765aa684eb9cf [2021-12-22 16:23:47,408 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:23:47,411 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:23:47,412 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:47,412 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:23:47,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:23:47,416 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:47" (1/1) ... [2021-12-22 16:23:47,417 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f90d756 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:47, skipping insertion in model container [2021-12-22 16:23:47,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:47" (1/1) ... [2021-12-22 16:23:47,423 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:23:47,444 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:47,569 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-22 16:23:47,578 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:47,580 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:47,591 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:47,606 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) [2021-12-22 16:23:47,607 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@ea2da72 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:47, skipping insertion in model container [2021-12-22 16:23:47,607 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:47,607 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-22 16:23:47,608 INFO L158 Benchmark]: Toolchain (without parser) took 197.45ms. Allocated memory is still 98.6MB. Free memory was 69.6MB in the beginning and 74.2MB in the end (delta: -4.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-22 16:23:47,609 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 98.6MB. Free memory is still 55.7MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 16:23:47,609 INFO L158 Benchmark]: CACSL2BoogieTranslator took 194.98ms. Allocated memory is still 98.6MB. Free memory was 69.3MB in the beginning and 74.2MB in the end (delta: -4.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-22 16:23:47,610 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 98.6MB. Free memory is still 55.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 194.98ms. Allocated memory is still 98.6MB. Free memory was 69.3MB in the beginning and 74.2MB in the end (delta: -4.9MB). Peak memory consumption was 10.5MB. 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=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/verifythis/tree_del_rec.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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-dev-e19ca92 [2021-12-22 16:23:49,335 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:23:49,336 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:23:49,370 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:23:49,372 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:23:49,375 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:23:49,376 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:23:49,378 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:23:49,380 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:23:49,383 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:23:49,384 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:23:49,385 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:23:49,387 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:23:49,388 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:23:49,389 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:23:49,390 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:23:49,391 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:23:49,392 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:23:49,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:23:49,396 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:23:49,399 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:23:49,402 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:23:49,402 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:23:49,403 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:23:49,405 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:23:49,408 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:23:49,408 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:23:49,408 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:23:49,409 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:23:49,410 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:23:49,411 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:23:49,411 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:23:49,412 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:23:49,414 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:23:49,415 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:23:49,415 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:23:49,416 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:23:49,416 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:23:49,416 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:23:49,417 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:23:49,418 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:23:49,418 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-22 16:23:49,444 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:23:49,444 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:23:49,445 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:23:49,445 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:23:49,446 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:23:49,446 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:23:49,447 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:23:49,447 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:23:49,447 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:23:49,447 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:23:49,448 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:23:49,449 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:23:49,450 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:23:49,450 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:23:49,450 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:23:49,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:49,458 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:23:49,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:23:49,458 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-22 16:23:49,458 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-22 16:23:49,458 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:23:49,458 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-22 16:23:49,459 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 448d6e9f7f0c094a8335d652a2766ae983308e33ec1a543ceaed97ae79744722 [2021-12-22 16:23:49,744 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:23:49,774 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:23:49,776 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:23:49,777 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:23:49,778 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:23:49,779 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-22 16:23:49,829 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66d70c4c4/59f007672c5944ada0d33ca97ac9cfc0/FLAGb5612cb3a [2021-12-22 16:23:50,227 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:23:50,228 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c [2021-12-22 16:23:50,233 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66d70c4c4/59f007672c5944ada0d33ca97ac9cfc0/FLAGb5612cb3a [2021-12-22 16:23:50,251 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66d70c4c4/59f007672c5944ada0d33ca97ac9cfc0 [2021-12-22 16:23:50,253 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:23:50,254 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:23:50,256 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:50,256 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:23:50,258 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:23:50,259 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,260 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@294afa67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50, skipping insertion in model container [2021-12-22 16:23:50,260 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,265 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:23:50,279 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:50,392 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-22 16:23:50,403 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,405 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,416 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:50,426 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-22 16:23:50,433 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:23:50,438 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-22 16:23:50,468 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,484 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,498 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:50,502 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:23:50,510 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec.c[585,598] [2021-12-22 16:23:50,517 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,518 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 16:23:50,528 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:23:50,540 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:23:50,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50 WrapperNode [2021-12-22 16:23:50,541 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:23:50,542 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:23:50,542 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:23:50,542 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:23:50,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,557 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,575 INFO L137 Inliner]: procedures = 31, calls = 61, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 75 [2021-12-22 16:23:50,576 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:23:50,577 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:23:50,577 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:23:50,577 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:23:50,582 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,590 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,593 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,603 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,607 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:23:50,612 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:23:50,612 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:23:50,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:23:50,613 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (1/1) ... [2021-12-22 16:23:50,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:23:50,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:23:50,646 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 16:23:50,667 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2021-12-22 16:23:50,692 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2021-12-22 16:23:50,692 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-12-22 16:23:50,692 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-12-22 16:23:50,693 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-22 16:23:50,693 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:23:50,693 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-12-22 16:23:50,693 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-12-22 16:23:50,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:23:50,694 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:23:50,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-22 16:23:50,694 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-22 16:23:50,694 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-12-22 16:23:50,694 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-12-22 16:23:50,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 16:23:50,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-22 16:23:50,815 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:23:50,817 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:23:51,424 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:23:51,431 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:23:51,432 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-22 16:23:51,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:23:51 BoogieIcfgContainer [2021-12-22 16:23:51,434 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:23:51,436 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:23:51,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:23:51,438 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:23:51,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:23:50" (1/3) ... [2021-12-22 16:23:51,439 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36792cc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:23:51, skipping insertion in model container [2021-12-22 16:23:51,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:23:50" (2/3) ... [2021-12-22 16:23:51,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36792cc6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:23:51, skipping insertion in model container [2021-12-22 16:23:51,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:23:51" (3/3) ... [2021-12-22 16:23:51,441 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2021-12-22 16:23:51,445 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:23:51,445 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 55 error locations. [2021-12-22 16:23:51,483 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:23:51,488 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 [2021-12-22 16:23:51,489 INFO L340 AbstractCegarLoop]: Starting to check reachability of 55 error locations. [2021-12-22 16:23:51,510 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) [2021-12-22 16:23:51,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:23:51,514 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:51,515 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:23:51,515 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:51,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:51,518 INFO L85 PathProgramCache]: Analyzing trace with hash 120433579, now seen corresponding path program 1 times [2021-12-22 16:23:51,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:51,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1462791218] [2021-12-22 16:23:51,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:51,537 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:51,538 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:51,539 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:51,545 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-22 16:23:51,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:51,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 16:23:51,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:51,675 INFO L387 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 [2021-12-22 16:23:51,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:51,683 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:51,683 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:51,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1462791218] [2021-12-22 16:23:51,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1462791218] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:51,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:51,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:23:51,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116408942] [2021-12-22 16:23:51,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:51,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:23:51,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:51,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:23:51,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:23:51,717 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) [2021-12-22 16:23:51,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:51,880 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2021-12-22 16:23:51,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:23:51,882 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 [2021-12-22 16:23:51,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:51,894 INFO L225 Difference]: With dead ends: 175 [2021-12-22 16:23:51,894 INFO L226 Difference]: Without dead ends: 172 [2021-12-22 16:23:51,896 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 [2021-12-22 16:23:51,898 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, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:23:51,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 326 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:23:51,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-12-22 16:23:51,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2021-12-22 16:23:51,946 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) [2021-12-22 16:23:51,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 192 transitions. [2021-12-22 16:23:51,950 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 192 transitions. Word has length 5 [2021-12-22 16:23:51,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:51,951 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 192 transitions. [2021-12-22 16:23:51,951 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) [2021-12-22 16:23:51,951 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 192 transitions. [2021-12-22 16:23:51,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:23:51,952 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:51,952 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:23:51,963 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:52,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:52,161 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:52,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:52,162 INFO L85 PathProgramCache]: Analyzing trace with hash 120433580, now seen corresponding path program 1 times [2021-12-22 16:23:52,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:52,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [42836071] [2021-12-22 16:23:52,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:52,163 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:52,163 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:52,164 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:52,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-22 16:23:52,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:52,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:23:52,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:52,228 INFO L387 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 [2021-12-22 16:23:52,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:52,239 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:52,239 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:52,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [42836071] [2021-12-22 16:23:52,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [42836071] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:52,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:52,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:23:52,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599998844] [2021-12-22 16:23:52,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:52,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:23:52,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:52,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:23:52,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:23:52,242 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) [2021-12-22 16:23:52,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:52,464 INFO L93 Difference]: Finished difference Result 169 states and 191 transitions. [2021-12-22 16:23:52,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:23:52,466 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 [2021-12-22 16:23:52,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:52,467 INFO L225 Difference]: With dead ends: 169 [2021-12-22 16:23:52,467 INFO L226 Difference]: Without dead ends: 169 [2021-12-22 16:23:52,467 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 [2021-12-22 16:23:52,468 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 [2021-12-22 16:23:52,468 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] [2021-12-22 16:23:52,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-12-22 16:23:52,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-12-22 16:23:52,475 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) [2021-12-22 16:23:52,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 191 transitions. [2021-12-22 16:23:52,491 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 191 transitions. Word has length 5 [2021-12-22 16:23:52,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:52,492 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 191 transitions. [2021-12-22 16:23:52,492 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) [2021-12-22 16:23:52,492 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 191 transitions. [2021-12-22 16:23:52,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:52,492 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:52,492 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:52,509 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:52,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:52,693 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:52,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:52,694 INFO L85 PathProgramCache]: Analyzing trace with hash 854953177, now seen corresponding path program 1 times [2021-12-22 16:23:52,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:52,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1191976656] [2021-12-22 16:23:52,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:52,695 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:52,695 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:52,695 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:52,697 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-22 16:23:52,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:52,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:23:52,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:52,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:52,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:52,856 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:52,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1191976656] [2021-12-22 16:23:52,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1191976656] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:52,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:52,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:23:52,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838453622] [2021-12-22 16:23:52,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:52,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:23:52,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:52,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:23:52,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:23:52,859 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) [2021-12-22 16:23:52,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:52,978 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2021-12-22 16:23:52,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:23:52,979 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 [2021-12-22 16:23:52,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:52,980 INFO L225 Difference]: With dead ends: 233 [2021-12-22 16:23:52,980 INFO L226 Difference]: Without dead ends: 233 [2021-12-22 16:23:52,981 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 [2021-12-22 16:23:52,982 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 [2021-12-22 16:23:52,982 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] [2021-12-22 16:23:52,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-12-22 16:23:52,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 177. [2021-12-22 16:23:52,993 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) [2021-12-22 16:23:52,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 201 transitions. [2021-12-22 16:23:52,995 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 201 transitions. Word has length 11 [2021-12-22 16:23:52,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:52,995 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 201 transitions. [2021-12-22 16:23:52,996 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) [2021-12-22 16:23:52,996 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 201 transitions. [2021-12-22 16:23:52,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:52,996 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:52,997 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:53,019 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Ended with exit code 0 [2021-12-22 16:23:53,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:53,206 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:53,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:53,207 INFO L85 PathProgramCache]: Analyzing trace with hash 873486780, now seen corresponding path program 1 times [2021-12-22 16:23:53,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:53,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [706914949] [2021-12-22 16:23:53,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:53,208 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:53,208 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:53,211 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:53,231 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-22 16:23:53,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:53,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 16:23:53,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:53,280 INFO L387 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 [2021-12-22 16:23:53,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:53,313 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:53,314 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:53,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [706914949] [2021-12-22 16:23:53,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [706914949] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:53,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:53,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:23:53,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128844311] [2021-12-22 16:23:53,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:53,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:23:53,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:53,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:23:53,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:23:53,316 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) [2021-12-22 16:23:53,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:53,662 INFO L93 Difference]: Finished difference Result 181 states and 205 transitions. [2021-12-22 16:23:53,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:23:53,662 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 [2021-12-22 16:23:53,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:53,664 INFO L225 Difference]: With dead ends: 181 [2021-12-22 16:23:53,664 INFO L226 Difference]: Without dead ends: 181 [2021-12-22 16:23:53,664 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 [2021-12-22 16:23:53,665 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 [2021-12-22 16:23:53,665 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] [2021-12-22 16:23:53,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-12-22 16:23:53,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2021-12-22 16:23:53,673 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) [2021-12-22 16:23:53,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-12-22 16:23:53,675 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 11 [2021-12-22 16:23:53,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:53,675 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-12-22 16:23:53,676 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) [2021-12-22 16:23:53,676 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-12-22 16:23:53,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:23:53,676 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:53,677 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:53,687 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:53,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:53,885 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:53,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:53,886 INFO L85 PathProgramCache]: Analyzing trace with hash 873486781, now seen corresponding path program 1 times [2021-12-22 16:23:53,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:53,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1994348162] [2021-12-22 16:23:53,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:53,886 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:53,886 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:53,887 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:53,889 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-22 16:23:53,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:53,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 16:23:53,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:53,955 INFO L387 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 [2021-12-22 16:23:53,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:53,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:53,995 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:53,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1994348162] [2021-12-22 16:23:53,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1994348162] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:53,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:53,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:23:53,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035729078] [2021-12-22 16:23:53,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:53,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:23:53,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:53,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:23:53,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:23:53,997 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) [2021-12-22 16:23:54,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:54,389 INFO L93 Difference]: Finished difference Result 185 states and 215 transitions. [2021-12-22 16:23:54,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:23:54,390 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 [2021-12-22 16:23:54,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:54,391 INFO L225 Difference]: With dead ends: 185 [2021-12-22 16:23:54,391 INFO L226 Difference]: Without dead ends: 185 [2021-12-22 16:23:54,391 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 [2021-12-22 16:23:54,392 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 93 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2021-12-22 16:23:54,392 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] [2021-12-22 16:23:54,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-22 16:23:54,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 182. [2021-12-22 16:23:54,400 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) [2021-12-22 16:23:54,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 209 transitions. [2021-12-22 16:23:54,401 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 209 transitions. Word has length 11 [2021-12-22 16:23:54,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:54,402 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 209 transitions. [2021-12-22 16:23:54,402 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) [2021-12-22 16:23:54,402 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 209 transitions. [2021-12-22 16:23:54,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-22 16:23:54,403 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:54,403 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:54,416 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:54,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:54,612 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:54,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:54,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1280810199, now seen corresponding path program 1 times [2021-12-22 16:23:54,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:54,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [155763967] [2021-12-22 16:23:54,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:54,613 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:54,613 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:54,613 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:54,615 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-22 16:23:54,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:54,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:23:54,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:54,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:23:54,736 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:23:54,736 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:54,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [155763967] [2021-12-22 16:23:54,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [155763967] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:23:54,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:23:54,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:23:54,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960829028] [2021-12-22 16:23:54,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:23:54,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:23:54,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:54,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:23:54,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:23:54,737 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) [2021-12-22 16:23:54,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:23:54,822 INFO L93 Difference]: Finished difference Result 242 states and 282 transitions. [2021-12-22 16:23:54,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:23:54,822 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 [2021-12-22 16:23:54,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:23:54,824 INFO L225 Difference]: With dead ends: 242 [2021-12-22 16:23:54,824 INFO L226 Difference]: Without dead ends: 242 [2021-12-22 16:23:54,824 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 [2021-12-22 16:23:54,824 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 [2021-12-22 16:23:54,825 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] [2021-12-22 16:23:54,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-12-22 16:23:54,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 204. [2021-12-22 16:23:54,831 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) [2021-12-22 16:23:54,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 241 transitions. [2021-12-22 16:23:54,833 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 241 transitions. Word has length 17 [2021-12-22 16:23:54,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:23:54,833 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 241 transitions. [2021-12-22 16:23:54,833 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) [2021-12-22 16:23:54,834 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 241 transitions. [2021-12-22 16:23:54,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-22 16:23:54,834 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:23:54,835 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:23:54,854 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-22 16:23:55,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:23:55,046 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:23:55,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:23:55,046 INFO L85 PathProgramCache]: Analyzing trace with hash -1539264760, now seen corresponding path program 1 times [2021-12-22 16:23:55,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:23:55,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [163102610] [2021-12-22 16:23:55,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:55,047 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:23:55,047 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:23:55,048 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:23:55,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-22 16:23:55,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:55,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 16:23:55,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:55,248 INFO L387 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 [2021-12-22 16:23:55,490 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:23:55,491 INFO L387 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 18 treesize of output 25 [2021-12-22 16:23:55,500 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 16:23:55,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:23:55,640 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:23:55,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [163102610] [2021-12-22 16:23:55,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [163102610] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:23:55,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2036238797] [2021-12-22 16:23:55,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:23:55,641 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:23:55,641 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:23:55,642 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:23:55,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-22 16:23:55,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:23:55,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 16:23:55,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:23:55,834 INFO L387 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 [2021-12-22 16:23:57,969 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:23:57,970 INFO L387 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 12 treesize of output 17 [2021-12-22 16:23:57,976 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 16:23:57,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:23:58,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2036238797] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:23:58,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:23:58,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-22 16:23:58,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876331329] [2021-12-22 16:23:58,076 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:23:58,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:23:58,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:23:58,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:23:58,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-22 16:23:58,077 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) [2021-12-22 16:24:04,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:04,481 INFO L93 Difference]: Finished difference Result 210 states and 249 transitions. [2021-12-22 16:24:04,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:24:04,482 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 [2021-12-22 16:24:04,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:04,483 INFO L225 Difference]: With dead ends: 210 [2021-12-22 16:24:04,483 INFO L226 Difference]: Without dead ends: 210 [2021-12-22 16:24:04,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-22 16:24:04,484 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 [2021-12-22 16:24:04,484 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] [2021-12-22 16:24:04,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-22 16:24:04,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2021-12-22 16:24:04,489 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) [2021-12-22 16:24:04,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 249 transitions. [2021-12-22 16:24:04,490 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 249 transitions. Word has length 29 [2021-12-22 16:24:04,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:04,490 INFO L470 AbstractCegarLoop]: Abstraction has 208 states and 249 transitions. [2021-12-22 16:24:04,490 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) [2021-12-22 16:24:04,490 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 249 transitions. [2021-12-22 16:24:04,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 16:24:04,491 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:04,493 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:04,502 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:04,706 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:04,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:04,899 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:04,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:04,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1070284721, now seen corresponding path program 1 times [2021-12-22 16:24:04,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:04,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [578223923] [2021-12-22 16:24:04,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:04,900 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:04,900 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:04,901 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:04,901 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-22 16:24:05,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:05,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:24:05,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:05,048 INFO L387 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 [2021-12-22 16:24:05,052 INFO L387 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 [2021-12-22 16:24:11,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:11,320 INFO L387 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 [2021-12-22 16:24:11,329 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:11,329 INFO L387 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 12 treesize of output 12 [2021-12-22 16:24:11,346 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:11,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:11,577 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:11,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [578223923] [2021-12-22 16:24:11,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [578223923] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:11,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [646137444] [2021-12-22 16:24:11,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:11,577 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:11,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:11,578 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:24:11,579 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-12-22 16:24:11,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:11,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-22 16:24:11,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:11,774 INFO L387 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 [2021-12-22 16:24:11,779 INFO L387 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 [2021-12-22 16:24:18,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:18,031 INFO L387 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 [2021-12-22 16:24:18,037 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:18,038 INFO L387 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 12 treesize of output 12 [2021-12-22 16:24:18,042 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:18,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:20,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [646137444] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:20,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:20,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-22 16:24:20,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163771199] [2021-12-22 16:24:20,223 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:20,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:24:20,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:20,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:24:20,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-22 16:24:20,224 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) [2021-12-22 16:24:20,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:20,833 INFO L93 Difference]: Finished difference Result 227 states and 281 transitions. [2021-12-22 16:24:20,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:24:20,834 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 [2021-12-22 16:24:20,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:20,835 INFO L225 Difference]: With dead ends: 227 [2021-12-22 16:24:20,835 INFO L226 Difference]: Without dead ends: 227 [2021-12-22 16:24:20,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-22 16:24:20,836 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 102 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 188 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:20,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 310 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 296 Invalid, 0 Unknown, 188 Unchecked, 0.6s Time] [2021-12-22 16:24:20,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-12-22 16:24:20,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 224. [2021-12-22 16:24:20,844 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) [2021-12-22 16:24:20,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 272 transitions. [2021-12-22 16:24:20,845 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 272 transitions. Word has length 25 [2021-12-22 16:24:20,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:20,846 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 272 transitions. [2021-12-22 16:24:20,846 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) [2021-12-22 16:24:20,846 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 272 transitions. [2021-12-22 16:24:20,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 16:24:20,847 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:20,847 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] [2021-12-22 16:24:20,862 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:21,055 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:21,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:21,247 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:21,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:21,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050227, now seen corresponding path program 1 times [2021-12-22 16:24:21,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:21,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [653363457] [2021-12-22 16:24:21,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:21,248 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:21,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:21,249 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:21,251 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-22 16:24:21,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:21,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:24:21,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:21,343 INFO L387 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 [2021-12-22 16:24:21,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:21,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:21,607 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:21,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [653363457] [2021-12-22 16:24:21,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [653363457] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:21,607 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:21,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-22 16:24:21,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897131599] [2021-12-22 16:24:21,607 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:21,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-22 16:24:21,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:21,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-22 16:24:21,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-22 16:24:21,608 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) [2021-12-22 16:24:22,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:22,928 INFO L93 Difference]: Finished difference Result 244 states and 296 transitions. [2021-12-22 16:24:22,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:24:22,929 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 [2021-12-22 16:24:22,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:22,930 INFO L225 Difference]: With dead ends: 244 [2021-12-22 16:24:22,930 INFO L226 Difference]: Without dead ends: 244 [2021-12-22 16:24:22,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:24:22,931 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 158 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s 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, 1.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:22,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 669 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 982 Invalid, 0 Unknown, 55 Unchecked, 1.2s Time] [2021-12-22 16:24:22,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-22 16:24:22,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2021-12-22 16:24:22,937 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) [2021-12-22 16:24:22,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 291 transitions. [2021-12-22 16:24:22,938 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 291 transitions. Word has length 25 [2021-12-22 16:24:22,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:22,938 INFO L470 AbstractCegarLoop]: Abstraction has 236 states and 291 transitions. [2021-12-22 16:24:22,939 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) [2021-12-22 16:24:22,940 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 291 transitions. [2021-12-22 16:24:22,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-22 16:24:22,940 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:22,940 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] [2021-12-22 16:24:22,949 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:23,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:23,150 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:23,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:23,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1668050226, now seen corresponding path program 1 times [2021-12-22 16:24:23,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:23,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [840716307] [2021-12-22 16:24:23,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:23,151 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:23,151 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:23,152 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:23,154 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-22 16:24:23,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:23,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:23,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:23,240 INFO L387 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 [2021-12-22 16:24:23,404 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:23,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:24,360 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-22 16:24:24,361 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:24,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [840716307] [2021-12-22 16:24:24,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [840716307] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:24,361 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:24,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-22 16:24:24,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201036693] [2021-12-22 16:24:24,361 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:24,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-22 16:24:24,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:24,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-22 16:24:24,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-22 16:24:24,362 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) [2021-12-22 16:24:28,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:28,626 INFO L93 Difference]: Finished difference Result 261 states and 327 transitions. [2021-12-22 16:24:28,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-22 16:24:28,628 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 [2021-12-22 16:24:28,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:28,642 INFO L225 Difference]: With dead ends: 261 [2021-12-22 16:24:28,642 INFO L226 Difference]: Without dead ends: 261 [2021-12-22 16:24:28,642 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-12-22 16:24:28,643 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 143 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 1482 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s 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 [2021-12-22 16:24:28,644 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] [2021-12-22 16:24:28,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-12-22 16:24:28,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 252. [2021-12-22 16:24:28,658 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) [2021-12-22 16:24:28,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 312 transitions. [2021-12-22 16:24:28,660 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 312 transitions. Word has length 25 [2021-12-22 16:24:28,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:28,660 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 312 transitions. [2021-12-22 16:24:28,660 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) [2021-12-22 16:24:28,660 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 312 transitions. [2021-12-22 16:24:28,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-22 16:24:28,662 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:28,663 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] [2021-12-22 16:24:28,676 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:28,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:28,872 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:28,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:28,873 INFO L85 PathProgramCache]: Analyzing trace with hash 369889479, now seen corresponding path program 1 times [2021-12-22 16:24:28,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:28,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1141720888] [2021-12-22 16:24:28,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:28,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:28,874 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:28,874 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:28,875 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-22 16:24:28,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:28,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 16:24:28,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:29,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:24:29,016 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:24:29,016 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:29,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1141720888] [2021-12-22 16:24:29,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1141720888] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:24:29,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:24:29,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:24:29,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312438168] [2021-12-22 16:24:29,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:24:29,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:24:29,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:29,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:24:29,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:24:29,018 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) [2021-12-22 16:24:29,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:29,035 INFO L93 Difference]: Finished difference Result 242 states and 293 transitions. [2021-12-22 16:24:29,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:24:29,036 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 [2021-12-22 16:24:29,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:29,037 INFO L225 Difference]: With dead ends: 242 [2021-12-22 16:24:29,038 INFO L226 Difference]: Without dead ends: 226 [2021-12-22 16:24:29,038 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 [2021-12-22 16:24:29,039 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 [2021-12-22 16:24:29,039 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] [2021-12-22 16:24:29,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-12-22 16:24:29,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2021-12-22 16:24:29,045 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) [2021-12-22 16:24:29,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 277 transitions. [2021-12-22 16:24:29,047 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 277 transitions. Word has length 30 [2021-12-22 16:24:29,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:29,047 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 277 transitions. [2021-12-22 16:24:29,047 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) [2021-12-22 16:24:29,048 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 277 transitions. [2021-12-22 16:24:29,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:29,049 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:29,049 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] [2021-12-22 16:24:29,074 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:29,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:29,274 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:29,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:29,275 INFO L85 PathProgramCache]: Analyzing trace with hash -648076771, now seen corresponding path program 1 times [2021-12-22 16:24:29,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:29,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [901757637] [2021-12-22 16:24:29,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:29,275 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:29,275 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:29,278 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:29,279 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-22 16:24:29,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:29,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-22 16:24:29,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:29,492 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-22 16:24:29,492 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:24:29,492 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:29,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [901757637] [2021-12-22 16:24:29,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [901757637] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:24:29,493 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:24:29,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-22 16:24:29,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237026544] [2021-12-22 16:24:29,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:24:29,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 16:24:29,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:29,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 16:24:29,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:24:29,494 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) [2021-12-22 16:24:29,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:29,742 INFO L93 Difference]: Finished difference Result 232 states and 286 transitions. [2021-12-22 16:24:29,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 16:24:29,743 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 [2021-12-22 16:24:29,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:29,744 INFO L225 Difference]: With dead ends: 232 [2021-12-22 16:24:29,744 INFO L226 Difference]: Without dead ends: 228 [2021-12-22 16:24:29,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-12-22 16:24:29,745 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 [2021-12-22 16:24:29,745 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] [2021-12-22 16:24:29,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-12-22 16:24:29,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 226. [2021-12-22 16:24:29,760 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) [2021-12-22 16:24:29,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 275 transitions. [2021-12-22 16:24:29,762 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 275 transitions. Word has length 31 [2021-12-22 16:24:29,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:29,762 INFO L470 AbstractCegarLoop]: Abstraction has 226 states and 275 transitions. [2021-12-22 16:24:29,762 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) [2021-12-22 16:24:29,762 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 275 transitions. [2021-12-22 16:24:29,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:24:29,765 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:29,765 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] [2021-12-22 16:24:29,778 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:29,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:29,976 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:29,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:29,976 INFO L85 PathProgramCache]: Analyzing trace with hash -2088825952, now seen corresponding path program 1 times [2021-12-22 16:24:29,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:29,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1875078228] [2021-12-22 16:24:29,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:29,977 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:29,977 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:29,978 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:29,979 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-22 16:24:30,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:30,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-22 16:24:30,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:30,166 INFO L387 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 [2021-12-22 16:24:30,175 INFO L387 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 [2021-12-22 16:24:30,272 INFO L353 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-22 16:24:30,272 INFO L387 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 [2021-12-22 16:24:30,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:30,282 INFO L387 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 [2021-12-22 16:24:30,497 INFO L387 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 [2021-12-22 16:24:30,500 INFO L387 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 [2021-12-22 16:24:30,573 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:24:30,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:31,454 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:24:31,455 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:31,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1875078228] [2021-12-22 16:24:31,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1875078228] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 16:24:31,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:31,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-22 16:24:31,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209301998] [2021-12-22 16:24:31,455 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:31,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-22 16:24:31,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:31,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-22 16:24:31,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:24:31,456 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) [2021-12-22 16:24:32,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:32,568 INFO L93 Difference]: Finished difference Result 244 states and 299 transitions. [2021-12-22 16:24:32,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-22 16:24:32,569 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 [2021-12-22 16:24:32,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:32,570 INFO L225 Difference]: With dead ends: 244 [2021-12-22 16:24:32,570 INFO L226 Difference]: Without dead ends: 244 [2021-12-22 16:24:32,571 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 [2021-12-22 16:24:32,571 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 44 mSDsluCounter, 2033 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2224 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:32,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 2224 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 345 Invalid, 0 Unknown, 107 Unchecked, 0.8s Time] [2021-12-22 16:24:32,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-22 16:24:32,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 233. [2021-12-22 16:24:32,578 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) [2021-12-22 16:24:32,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-22 16:24:32,580 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 31 [2021-12-22 16:24:32,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:32,581 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-22 16:24:32,581 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) [2021-12-22 16:24:32,581 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-22 16:24:32,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-22 16:24:32,582 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:32,582 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:32,595 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-12-22 16:24:32,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:32,792 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:32,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:32,793 INFO L85 PathProgramCache]: Analyzing trace with hash -931523584, now seen corresponding path program 1 times [2021-12-22 16:24:32,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:32,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1405870521] [2021-12-22 16:24:32,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:32,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:32,793 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:32,794 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:32,795 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-22 16:24:33,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:33,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:33,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:33,129 INFO L387 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 [2021-12-22 16:24:33,137 INFO L387 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 [2021-12-22 16:24:39,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:39,422 INFO L387 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 [2021-12-22 16:24:39,430 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:39,430 INFO L387 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 12 treesize of output 12 [2021-12-22 16:24:39,448 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-22 16:24:39,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:39,680 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:39,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1405870521] [2021-12-22 16:24:39,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1405870521] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:39,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2146130189] [2021-12-22 16:24:39,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:39,680 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:39,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:39,694 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:24:39,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-22 16:24:40,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:40,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-22 16:24:40,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:40,054 INFO L387 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 [2021-12-22 16:24:40,062 INFO L387 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 [2021-12-22 16:24:44,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:24:44,303 INFO L387 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 [2021-12-22 16:24:44,311 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:24:44,312 INFO L387 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 12 treesize of output 12 [2021-12-22 16:24:44,317 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-22 16:24:44,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:44,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2146130189] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:44,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:44,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-22 16:24:44,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229094880] [2021-12-22 16:24:44,477 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:44,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:24:44,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:44,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:24:44,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-22 16:24:44,478 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) [2021-12-22 16:24:45,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:45,022 INFO L93 Difference]: Finished difference Result 238 states and 292 transitions. [2021-12-22 16:24:45,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:24:45,023 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 [2021-12-22 16:24:45,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:45,024 INFO L225 Difference]: With dead ends: 238 [2021-12-22 16:24:45,024 INFO L226 Difference]: Without dead ends: 238 [2021-12-22 16:24:45,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=27, Invalid=62, Unknown=1, NotChecked=0, Total=90 [2021-12-22 16:24:45,024 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 170 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 176 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:24:45,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 310 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 371 Invalid, 0 Unknown, 176 Unchecked, 0.5s Time] [2021-12-22 16:24:45,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-12-22 16:24:45,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 234. [2021-12-22 16:24:45,028 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) [2021-12-22 16:24:45,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 283 transitions. [2021-12-22 16:24:45,029 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 283 transitions. Word has length 45 [2021-12-22 16:24:45,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:45,030 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 283 transitions. [2021-12-22 16:24:45,030 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) [2021-12-22 16:24:45,030 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 283 transitions. [2021-12-22 16:24:45,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-22 16:24:45,030 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:45,031 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-22 16:24:45,039 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-22 16:24:45,242 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-12-22 16:24:45,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:45,439 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:45,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:45,440 INFO L85 PathProgramCache]: Analyzing trace with hash -931523585, now seen corresponding path program 1 times [2021-12-22 16:24:45,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:45,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1160868293] [2021-12-22 16:24:45,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:45,440 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:45,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:45,441 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:45,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-22 16:24:45,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:45,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-22 16:24:45,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:45,644 INFO L387 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 [2021-12-22 16:24:45,779 INFO L353 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-22 16:24:45,780 INFO L387 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 18 treesize of output 25 [2021-12-22 16:24:45,784 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-22 16:24:45,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:45,873 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:24:45,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1160868293] [2021-12-22 16:24:45,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1160868293] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:45,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [938345204] [2021-12-22 16:24:45,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:24:45,873 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:24:45,873 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:24:45,874 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:24:45,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-22 16:24:46,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:24:46,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-22 16:24:46,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:46,159 INFO L387 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 [2021-12-22 16:24:48,258 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:24:48,259 INFO L387 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 12 treesize of output 17 [2021-12-22 16:24:48,263 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 13 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-22 16:24:48,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:24:48,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [938345204] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:24:48,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:24:48,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-22 16:24:48,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345967561] [2021-12-22 16:24:48,348 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:24:48,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:24:48,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:24:48,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:24:48,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-22 16:24:48,349 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) [2021-12-22 16:24:54,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:24:54,696 INFO L93 Difference]: Finished difference Result 237 states and 291 transitions. [2021-12-22 16:24:54,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:24:54,696 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 [2021-12-22 16:24:54,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:24:54,697 INFO L225 Difference]: With dead ends: 237 [2021-12-22 16:24:54,697 INFO L226 Difference]: Without dead ends: 237 [2021-12-22 16:24:54,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 91 SyntacticMatches, 7 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-22 16:24:54,698 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 83 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2021-12-22 16:24:54,698 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] [2021-12-22 16:24:54,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2021-12-22 16:24:54,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 233. [2021-12-22 16:24:54,702 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) [2021-12-22 16:24:54,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 281 transitions. [2021-12-22 16:24:54,703 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 281 transitions. Word has length 45 [2021-12-22 16:24:54,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:24:54,703 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 281 transitions. [2021-12-22 16:24:54,703 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) [2021-12-22 16:24:54,703 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 281 transitions. [2021-12-22 16:24:54,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 16:24:54,704 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:24:54,704 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-22 16:24:54,710 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-12-22 16:24:54,920 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-12-22 16:24:55,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:24:55,110 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 51 more)] === [2021-12-22 16:24:55,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:24:55,110 INFO L85 PathProgramCache]: Analyzing trace with hash 1901629290, now seen corresponding path program 2 times [2021-12-22 16:24:55,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:24:55,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1787059072] [2021-12-22 16:24:55,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-22 16:24:55,111 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:24:55,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:24:55,112 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:24:55,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-22 16:24:55,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-22 16:24:55,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-22 16:24:55,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-22 16:24:55,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:24:55,319 INFO L387 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 [2021-12-22 16:24:59,524 INFO L353 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-22 16:24:59,525 INFO L387 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 21 treesize of output 37 [2021-12-22 16:24:59,612 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-22 16:24:59,612 INFO L328 TraceCheckSpWp]: Computing backward predicates...