./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../sv-benchmarks/c/verifythis/tree_del_iter.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version c3fed411 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_iter.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 cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 05:44:02,095 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 05:44:02,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 05:44:02,129 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 05:44:02,130 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 05:44:02,131 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 05:44:02,132 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 05:44:02,133 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 05:44:02,137 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 05:44:02,138 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 05:44:02,138 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 05:44:02,139 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 05:44:02,141 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 05:44:02,143 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 05:44:02,144 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 05:44:02,146 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 05:44:02,147 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 05:44:02,149 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 05:44:02,152 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 05:44:02,156 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 05:44:02,158 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 05:44:02,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 05:44:02,162 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 05:44:02,163 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 05:44:02,165 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 05:44:02,170 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 05:44:02,170 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 05:44:02,171 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 05:44:02,171 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 05:44:02,172 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 05:44:02,172 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 05:44:02,173 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 05:44:02,174 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 05:44:02,175 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 05:44:02,176 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 05:44:02,177 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 05:44:02,177 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 05:44:02,178 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 05:44:02,178 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 05:44:02,178 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 05:44:02,179 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 05:44:02,180 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Default.epf [2021-12-16 05:44:02,205 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 05:44:02,205 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 05:44:02,206 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 05:44:02,206 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 05:44:02,207 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 05:44:02,207 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 05:44:02,207 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 05:44:02,208 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 05:44:02,208 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 05:44:02,208 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 05:44:02,209 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-16 05:44:02,209 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-16 05:44:02,209 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 05:44:02,209 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-16 05:44:02,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-16 05:44:02,210 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 05:44:02,211 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 05:44:02,211 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 05:44:02,211 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 05:44:02,211 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 05:44:02,212 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 05:44:02,212 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 05:44:02,212 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-16 05:44:02,212 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-16 05:44:02,213 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 05:44:02,213 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2021-12-16 05:44:02,454 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 05:44:02,479 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 05:44:02,481 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 05:44:02,483 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 05:44:02,483 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 05:44:02,484 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2021-12-16 05:44:02,531 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51f6572eb/a5831b3519bd4a48ae0ea5eb13e2ba04/FLAG74b0ca73b [2021-12-16 05:44:03,007 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 05:44:03,008 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2021-12-16 05:44:03,014 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51f6572eb/a5831b3519bd4a48ae0ea5eb13e2ba04/FLAG74b0ca73b [2021-12-16 05:44:03,036 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51f6572eb/a5831b3519bd4a48ae0ea5eb13e2ba04 [2021-12-16 05:44:03,039 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 05:44:03,041 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 05:44:03,044 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 05:44:03,044 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 05:44:03,047 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 05:44:03,047 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 05:44:03" (1/1) ... [2021-12-16 05:44:03,048 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fc01adb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:03, skipping insertion in model container [2021-12-16 05:44:03,048 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 05:44:03" (1/1) ... [2021-12-16 05:44:03,057 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 05:44:03,077 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 05:44:03,220 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_iter.c[586,599] [2021-12-16 05:44:03,251 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-16 05:44:03,276 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 05:44:03,291 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) [2021-12-16 05:44:03,291 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@587b08a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:03, skipping insertion in model container [2021-12-16 05:44:03,292 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 05:44:03,292 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-16 05:44:03,294 INFO L158 Benchmark]: Toolchain (without parser) took 251.26ms. Allocated memory is still 100.7MB. Free memory was 71.2MB in the beginning and 61.7MB in the end (delta: 9.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-16 05:44:03,296 INFO L158 Benchmark]: CDTParser took 0.20ms. Allocated memory is still 73.4MB. Free memory is still 52.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-16 05:44:03,297 INFO L158 Benchmark]: CACSL2BoogieTranslator took 248.01ms. Allocated memory is still 100.7MB. Free memory was 70.9MB in the beginning and 61.7MB in the end (delta: 9.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-12-16 05:44:03,299 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20ms. Allocated memory is still 73.4MB. Free memory is still 52.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 248.01ms. Allocated memory is still 100.7MB. Free memory was 70.9MB in the beginning and 61.7MB in the end (delta: 9.2MB). 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_iter.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 cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe --- Real Ultimate output --- This is Ultimate 0.2.2-tmp.no-commuhash-c3fed41 [2021-12-16 05:44:04,989 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-16 05:44:04,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-16 05:44:05,026 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-16 05:44:05,029 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-16 05:44:05,033 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-16 05:44:05,035 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-16 05:44:05,040 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-16 05:44:05,042 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-16 05:44:05,048 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-16 05:44:05,058 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-16 05:44:05,062 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-16 05:44:05,063 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-16 05:44:05,065 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-16 05:44:05,066 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-16 05:44:05,068 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-16 05:44:05,069 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-16 05:44:05,070 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-16 05:44:05,074 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-16 05:44:05,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-16 05:44:05,081 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-16 05:44:05,082 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-16 05:44:05,083 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-16 05:44:05,084 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-16 05:44:05,087 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-16 05:44:05,088 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-16 05:44:05,088 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-16 05:44:05,090 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-16 05:44:05,090 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-16 05:44:05,091 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-16 05:44:05,091 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-16 05:44:05,092 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-16 05:44:05,094 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-16 05:44:05,094 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-16 05:44:05,095 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-16 05:44:05,096 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-16 05:44:05,096 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-16 05:44:05,096 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-16 05:44:05,097 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-16 05:44:05,098 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-16 05:44:05,100 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-16 05:44:05,101 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-MemCleanup-32bit-Automizer_Bitvector.epf [2021-12-16 05:44:05,125 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-16 05:44:05,127 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-16 05:44:05,128 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-16 05:44:05,128 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-16 05:44:05,129 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-16 05:44:05,129 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-16 05:44:05,130 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-16 05:44:05,130 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-16 05:44:05,131 INFO L138 SettingsManager]: * Use SBE=true [2021-12-16 05:44:05,131 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-16 05:44:05,132 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-16 05:44:05,132 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-16 05:44:05,132 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-16 05:44:05,132 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-16 05:44:05,133 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-16 05:44:05,133 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-16 05:44:05,133 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-16 05:44:05,133 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-16 05:44:05,133 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-16 05:44:05,134 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-16 05:44:05,134 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-16 05:44:05,134 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-16 05:44:05,134 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-16 05:44:05,134 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-16 05:44:05,135 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-16 05:44:05,135 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-16 05:44:05,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 05:44:05,135 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-16 05:44:05,135 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-16 05:44:05,136 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-16 05:44:05,136 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-16 05:44:05,136 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-16 05:44:05,136 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-16 05:44:05,137 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce1bb7a06b9dd56fbf663e182ffe801720ee05ee19a126a08070f1616bc4afe [2021-12-16 05:44:05,437 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-16 05:44:05,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-16 05:44:05,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-16 05:44:05,467 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-16 05:44:05,469 INFO L275 PluginConnector]: CDTParser initialized [2021-12-16 05:44:05,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_iter.c [2021-12-16 05:44:05,525 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85c1292c5/06ba8ec5116f48d1a5f5c68110c76a48/FLAGb5f48219f [2021-12-16 05:44:05,986 INFO L306 CDTParser]: Found 1 translation units. [2021-12-16 05:44:05,987 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_iter.c [2021-12-16 05:44:05,992 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85c1292c5/06ba8ec5116f48d1a5f5c68110c76a48/FLAGb5f48219f [2021-12-16 05:44:06,005 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/85c1292c5/06ba8ec5116f48d1a5f5c68110c76a48 [2021-12-16 05:44:06,007 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-16 05:44:06,008 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-16 05:44:06,011 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-16 05:44:06,011 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-16 05:44:06,014 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-16 05:44:06,015 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,016 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a786f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06, skipping insertion in model container [2021-12-16 05:44:06,017 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,023 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-16 05:44:06,040 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 05:44:06,152 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_iter.c[586,599] [2021-12-16 05:44:06,175 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-16 05:44:06,190 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 05:44:06,214 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-16 05:44:06,231 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-16 05:44:06,238 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_iter.c[586,599] [2021-12-16 05:44:06,253 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-16 05:44:06,267 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 05:44:06,282 INFO L203 MainTranslator]: Completed pre-run [2021-12-16 05:44:06,294 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_iter.c[586,599] [2021-12-16 05:44:06,316 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-16 05:44:06,326 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-16 05:44:06,351 INFO L208 MainTranslator]: Completed translation [2021-12-16 05:44:06,351 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06 WrapperNode [2021-12-16 05:44:06,351 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-16 05:44:06,352 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-16 05:44:06,353 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-16 05:44:06,353 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-16 05:44:06,358 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,377 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,408 INFO L137 Inliner]: procedures = 31, calls = 64, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 122 [2021-12-16 05:44:06,408 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-16 05:44:06,410 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-16 05:44:06,410 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-16 05:44:06,410 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-16 05:44:06,417 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,434 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,459 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,463 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,465 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,473 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-16 05:44:06,474 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-16 05:44:06,474 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-16 05:44:06,475 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-16 05:44:06,475 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (1/1) ... [2021-12-16 05:44:06,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-16 05:44:06,490 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 05:44:06,503 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) [2021-12-16 05:44:06,528 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 [2021-12-16 05:44:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-16 05:44:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-16 05:44:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-16 05:44:06,547 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-16 05:44:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-12-16 05:44:06,548 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-12-16 05:44:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-16 05:44:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-12-16 05:44:06,548 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-12-16 05:44:06,548 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-16 05:44:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-16 05:44:06,549 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-16 05:44:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-16 05:44:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-12-16 05:44:06,549 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-12-16 05:44:06,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-16 05:44:06,550 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-16 05:44:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-16 05:44:06,550 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-16 05:44:06,550 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-12-16 05:44:06,550 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-12-16 05:44:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-16 05:44:06,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-16 05:44:06,663 INFO L236 CfgBuilder]: Building ICFG [2021-12-16 05:44:06,680 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-16 05:44:07,162 INFO L277 CfgBuilder]: Performing block encoding [2021-12-16 05:44:07,169 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-16 05:44:07,170 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-16 05:44:07,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 05:44:07 BoogieIcfgContainer [2021-12-16 05:44:07,172 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-16 05:44:07,173 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-16 05:44:07,173 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-16 05:44:07,186 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-16 05:44:07,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.12 05:44:06" (1/3) ... [2021-12-16 05:44:07,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d2151b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 05:44:07, skipping insertion in model container [2021-12-16 05:44:07,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.12 05:44:06" (2/3) ... [2021-12-16 05:44:07,191 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d2151b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.12 05:44:07, skipping insertion in model container [2021-12-16 05:44:07,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.12 05:44:07" (3/3) ... [2021-12-16 05:44:07,192 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2021-12-16 05:44:07,197 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-16 05:44:07,204 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 64 error locations. [2021-12-16 05:44:07,248 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-16 05:44:07,256 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 [2021-12-16 05:44:07,257 INFO L340 AbstractCegarLoop]: Starting to check reachability of 64 error locations. [2021-12-16 05:44:07,289 INFO L276 IsEmpty]: Start isEmpty. Operand has 190 states, 99 states have (on average 1.797979797979798) internal successors, (178), 163 states have internal predecessors, (178), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-16 05:44:07,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-16 05:44:07,295 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:07,296 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-16 05:44:07,297 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:07,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:07,301 INFO L85 PathProgramCache]: Analyzing trace with hash 88048840, now seen corresponding path program 1 times [2021-12-16 05:44:07,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:07,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980589208] [2021-12-16 05:44:07,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:07,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:07,313 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:07,319 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) [2021-12-16 05:44:07,336 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-16 05:44:07,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:07,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-16 05:44:07,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:07,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:07,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:07,553 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:07,553 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:07,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980589208] [2021-12-16 05:44:07,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980589208] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:07,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:07,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-16 05:44:07,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706247334] [2021-12-16 05:44:07,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:07,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 05:44:07,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:07,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 05:44:07,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 05:44:07,600 INFO L87 Difference]: Start difference. First operand has 190 states, 99 states have (on average 1.797979797979798) internal successors, (178), 163 states have internal predecessors, (178), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) 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) [2021-12-16 05:44:07,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:07,855 INFO L93 Difference]: Finished difference Result 191 states and 216 transitions. [2021-12-16 05:44:07,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 05:44:07,858 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 [2021-12-16 05:44:07,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:07,871 INFO L225 Difference]: With dead ends: 191 [2021-12-16 05:44:07,871 INFO L226 Difference]: Without dead ends: 188 [2021-12-16 05:44:07,873 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 [2021-12-16 05:44:07,882 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 6 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:07,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 350 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 05:44:07,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-12-16 05:44:07,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 186. [2021-12-16 05:44:07,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 97 states have (on average 1.731958762886598) internal successors, (168), 159 states have internal predecessors, (168), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-16 05:44:07,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 208 transitions. [2021-12-16 05:44:07,956 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 208 transitions. Word has length 5 [2021-12-16 05:44:07,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:07,956 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 208 transitions. [2021-12-16 05:44:07,957 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) [2021-12-16 05:44:07,957 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 208 transitions. [2021-12-16 05:44:07,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-16 05:44:07,958 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:07,958 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-16 05:44:07,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:08,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:08,167 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:08,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:08,168 INFO L85 PathProgramCache]: Analyzing trace with hash 88048841, now seen corresponding path program 1 times [2021-12-16 05:44:08,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:08,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [973350816] [2021-12-16 05:44:08,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:08,169 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:08,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:08,171 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) [2021-12-16 05:44:08,175 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-16 05:44:08,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:08,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-16 05:44:08,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:08,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:08,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:08,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:08,251 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:08,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [973350816] [2021-12-16 05:44:08,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [973350816] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:08,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:08,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-16 05:44:08,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531705314] [2021-12-16 05:44:08,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:08,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-16 05:44:08,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:08,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-16 05:44:08,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-16 05:44:08,258 INFO L87 Difference]: Start difference. First operand 186 states and 208 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) [2021-12-16 05:44:08,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:08,502 INFO L93 Difference]: Finished difference Result 185 states and 207 transitions. [2021-12-16 05:44:08,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-16 05:44:08,504 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 [2021-12-16 05:44:08,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:08,505 INFO L225 Difference]: With dead ends: 185 [2021-12-16 05:44:08,505 INFO L226 Difference]: Without dead ends: 185 [2021-12-16 05:44:08,505 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 [2021-12-16 05:44:08,506 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 2 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:08,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 353 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 05:44:08,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-12-16 05:44:08,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-12-16 05:44:08,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 97 states have (on average 1.7216494845360826) internal successors, (167), 158 states have internal predecessors, (167), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-16 05:44:08,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 207 transitions. [2021-12-16 05:44:08,529 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 207 transitions. Word has length 5 [2021-12-16 05:44:08,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:08,529 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 207 transitions. [2021-12-16 05:44:08,529 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) [2021-12-16 05:44:08,529 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 207 transitions. [2021-12-16 05:44:08,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-16 05:44:08,530 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:08,531 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:08,542 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:08,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:08,739 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:08,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:08,740 INFO L85 PathProgramCache]: Analyzing trace with hash -163614216, now seen corresponding path program 1 times [2021-12-16 05:44:08,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:08,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1467860466] [2021-12-16 05:44:08,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:08,741 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:08,741 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:08,742 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) [2021-12-16 05:44:08,744 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-16 05:44:08,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:08,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-16 05:44:08,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:08,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:08,926 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:08,927 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1467860466] [2021-12-16 05:44:08,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1467860466] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:08,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:08,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-16 05:44:08,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229770279] [2021-12-16 05:44:08,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:08,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-16 05:44:08,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:08,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-16 05:44:08,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-16 05:44:08,932 INFO L87 Difference]: Start difference. First operand 185 states and 207 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) [2021-12-16 05:44:09,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:09,071 INFO L93 Difference]: Finished difference Result 297 states and 335 transitions. [2021-12-16 05:44:09,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-16 05:44:09,072 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 [2021-12-16 05:44:09,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:09,075 INFO L225 Difference]: With dead ends: 297 [2021-12-16 05:44:09,075 INFO L226 Difference]: Without dead ends: 297 [2021-12-16 05:44:09,078 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 [2021-12-16 05:44:09,082 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 193 mSDsluCounter, 1030 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1243 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:09,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 1243 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 05:44:09,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-12-16 05:44:09,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 193. [2021-12-16 05:44:09,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 102 states have (on average 1.6862745098039216) internal successors, (172), 164 states have internal predecessors, (172), 21 states have call successors, (21), 7 states have call predecessors, (21), 8 states have return successors, (24), 21 states have call predecessors, (24), 21 states have call successors, (24) [2021-12-16 05:44:09,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 217 transitions. [2021-12-16 05:44:09,110 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 217 transitions. Word has length 11 [2021-12-16 05:44:09,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:09,111 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 217 transitions. [2021-12-16 05:44:09,111 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) [2021-12-16 05:44:09,112 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 217 transitions. [2021-12-16 05:44:09,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-16 05:44:09,112 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:09,113 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:09,126 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:09,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:09,327 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:09,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:09,328 INFO L85 PathProgramCache]: Analyzing trace with hash -916126343, now seen corresponding path program 1 times [2021-12-16 05:44:09,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:09,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1395988884] [2021-12-16 05:44:09,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:09,329 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:09,329 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:09,330 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) [2021-12-16 05:44:09,330 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-16 05:44:09,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:09,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-16 05:44:09,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:09,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:09,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:09,467 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:09,468 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:09,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1395988884] [2021-12-16 05:44:09,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1395988884] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:09,468 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:09,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-16 05:44:09,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493768001] [2021-12-16 05:44:09,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:09,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 05:44:09,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:09,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 05:44:09,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-16 05:44:09,470 INFO L87 Difference]: Start difference. First operand 193 states and 217 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) [2021-12-16 05:44:09,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:09,863 INFO L93 Difference]: Finished difference Result 197 states and 221 transitions. [2021-12-16 05:44:09,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 05:44:09,863 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 [2021-12-16 05:44:09,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:09,865 INFO L225 Difference]: With dead ends: 197 [2021-12-16 05:44:09,865 INFO L226 Difference]: Without dead ends: 197 [2021-12-16 05:44:09,865 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 [2021-12-16 05:44:09,866 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 64 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:09,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 309 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-16 05:44:09,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-12-16 05:44:09,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 195. [2021-12-16 05:44:09,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 104 states have (on average 1.6923076923076923) internal successors, (176), 164 states have internal predecessors, (176), 21 states have call successors, (21), 7 states have call predecessors, (21), 8 states have return successors, (24), 23 states have call predecessors, (24), 21 states have call successors, (24) [2021-12-16 05:44:09,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 221 transitions. [2021-12-16 05:44:09,874 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 221 transitions. Word has length 11 [2021-12-16 05:44:09,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:09,874 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 221 transitions. [2021-12-16 05:44:09,874 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) [2021-12-16 05:44:09,874 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 221 transitions. [2021-12-16 05:44:09,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-16 05:44:09,875 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:09,875 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:09,885 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:10,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:10,083 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:10,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:10,084 INFO L85 PathProgramCache]: Analyzing trace with hash -916126342, now seen corresponding path program 1 times [2021-12-16 05:44:10,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:10,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [563956167] [2021-12-16 05:44:10,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:10,085 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:10,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:10,086 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) [2021-12-16 05:44:10,086 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-16 05:44:10,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:10,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-16 05:44:10,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:10,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:10,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:10,194 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:10,194 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:10,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [563956167] [2021-12-16 05:44:10,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [563956167] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:10,195 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:10,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-16 05:44:10,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926374932] [2021-12-16 05:44:10,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:10,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-16 05:44:10,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:10,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-16 05:44:10,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-16 05:44:10,196 INFO L87 Difference]: Start difference. First operand 195 states and 221 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) [2021-12-16 05:44:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:10,612 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2021-12-16 05:44:10,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-16 05:44:10,613 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 [2021-12-16 05:44:10,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:10,614 INFO L225 Difference]: With dead ends: 201 [2021-12-16 05:44:10,614 INFO L226 Difference]: Without dead ends: 201 [2021-12-16 05:44:10,614 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 [2021-12-16 05:44:10,615 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 62 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:10,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 336 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-16 05:44:10,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-12-16 05:44:10,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 198. [2021-12-16 05:44:10,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 106 states have (on average 1.669811320754717) internal successors, (177), 166 states have internal predecessors, (177), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (26), 24 states have call predecessors, (26), 22 states have call successors, (26) [2021-12-16 05:44:10,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 225 transitions. [2021-12-16 05:44:10,622 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 225 transitions. Word has length 11 [2021-12-16 05:44:10,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:10,623 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 225 transitions. [2021-12-16 05:44:10,623 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) [2021-12-16 05:44:10,623 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 225 transitions. [2021-12-16 05:44:10,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-16 05:44:10,624 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:10,624 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:10,635 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:10,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:10,825 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:10,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:10,825 INFO L85 PathProgramCache]: Analyzing trace with hash -1497511222, now seen corresponding path program 1 times [2021-12-16 05:44:10,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:10,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1596553339] [2021-12-16 05:44:10,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:10,826 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:10,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:10,827 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) [2021-12-16 05:44:10,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-16 05:44:10,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:10,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-16 05:44:10,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:10,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:10,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:10,978 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:10,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1596553339] [2021-12-16 05:44:10,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1596553339] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:10,978 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:10,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-16 05:44:10,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042214350] [2021-12-16 05:44:10,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:10,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-16 05:44:10,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:10,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-16 05:44:10,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-16 05:44:10,980 INFO L87 Difference]: Start difference. First operand 198 states and 225 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) [2021-12-16 05:44:11,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:11,084 INFO L93 Difference]: Finished difference Result 306 states and 347 transitions. [2021-12-16 05:44:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-16 05:44:11,087 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 [2021-12-16 05:44:11,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:11,088 INFO L225 Difference]: With dead ends: 306 [2021-12-16 05:44:11,088 INFO L226 Difference]: Without dead ends: 306 [2021-12-16 05:44:11,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-16 05:44:11,089 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 192 mSDsluCounter, 1029 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 1241 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:11,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 1241 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-16 05:44:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-12-16 05:44:11,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 244. [2021-12-16 05:44:11,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 145 states have (on average 1.696551724137931) internal successors, (246), 205 states have internal predecessors, (246), 28 states have call successors, (28), 8 states have call predecessors, (28), 9 states have return successors, (32), 30 states have call predecessors, (32), 28 states have call successors, (32) [2021-12-16 05:44:11,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 306 transitions. [2021-12-16 05:44:11,099 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 306 transitions. Word has length 17 [2021-12-16 05:44:11,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:11,099 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 306 transitions. [2021-12-16 05:44:11,099 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) [2021-12-16 05:44:11,099 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 306 transitions. [2021-12-16 05:44:11,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-16 05:44:11,100 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:11,100 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:11,110 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:11,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:11,305 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:11,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:11,305 INFO L85 PathProgramCache]: Analyzing trace with hash -2030552348, now seen corresponding path program 1 times [2021-12-16 05:44:11,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:11,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [978936607] [2021-12-16 05:44:11,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:11,306 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:11,306 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:11,307 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) [2021-12-16 05:44:11,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-16 05:44:11,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:11,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-16 05:44:11,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:11,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:11,652 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-16 05:44:11,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-16 05:44:11,664 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 05:44:11,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:11,829 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:11,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [978936607] [2021-12-16 05:44:11,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [978936607] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:11,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [461818889] [2021-12-16 05:44:11,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:11,830 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-16 05:44:11,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-16 05:44:11,835 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) [2021-12-16 05:44:11,843 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-12-16 05:44:12,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:12,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-16 05:44:12,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:12,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:14,257 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-16 05:44:14,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-16 05:44:14,265 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 05:44:14,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:14,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [461818889] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:14,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:14,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-16 05:44:14,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706589146] [2021-12-16 05:44:14,399 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:14,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 05:44:14,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:14,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 05:44:14,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-16 05:44:14,401 INFO L87 Difference]: Start difference. First operand 244 states and 306 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) [2021-12-16 05:44:18,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:18,795 INFO L93 Difference]: Finished difference Result 250 states and 314 transitions. [2021-12-16 05:44:18,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 05:44:18,795 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 [2021-12-16 05:44:18,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:18,797 INFO L225 Difference]: With dead ends: 250 [2021-12-16 05:44:18,797 INFO L226 Difference]: Without dead ends: 250 [2021-12-16 05:44:18,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 9 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-16 05:44:18,798 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 61 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 304 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:18,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 442 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 216 Invalid, 0 Unknown, 304 Unchecked, 0.3s Time] [2021-12-16 05:44:18,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2021-12-16 05:44:18,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2021-12-16 05:44:18,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 148 states have (on average 1.6891891891891893) internal successors, (250), 208 states have internal predecessors, (250), 28 states have call successors, (28), 8 states have call predecessors, (28), 10 states have return successors, (36), 31 states have call predecessors, (36), 28 states have call successors, (36) [2021-12-16 05:44:18,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 314 transitions. [2021-12-16 05:44:18,806 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 314 transitions. Word has length 29 [2021-12-16 05:44:18,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:18,806 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 314 transitions. [2021-12-16 05:44:18,806 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) [2021-12-16 05:44:18,806 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 314 transitions. [2021-12-16 05:44:18,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-16 05:44:18,807 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:18,808 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:18,814 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:19,024 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:19,221 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 [2021-12-16 05:44:19,221 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:19,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:19,222 INFO L85 PathProgramCache]: Analyzing trace with hash 2020472179, now seen corresponding path program 1 times [2021-12-16 05:44:19,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:19,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [877065336] [2021-12-16 05:44:19,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:19,222 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:19,223 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:19,223 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) [2021-12-16 05:44:19,224 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-16 05:44:19,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:19,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-16 05:44:19,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:19,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:19,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:25,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 05:44:25,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-16 05:44:25,732 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-16 05:44:25,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-16 05:44:25,754 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 05:44:25,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:28,002 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:28,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [877065336] [2021-12-16 05:44:28,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [877065336] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:28,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [669291848] [2021-12-16 05:44:28,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:28,003 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-16 05:44:28,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-16 05:44:28,008 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) [2021-12-16 05:44:28,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-12-16 05:44:28,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:28,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-16 05:44:28,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:28,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:28,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:32,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 05:44:32,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-16 05:44:32,477 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-16 05:44:32,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-16 05:44:32,484 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 25 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-16 05:44:32,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:32,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [669291848] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:32,673 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:32,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-16 05:44:32,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716558757] [2021-12-16 05:44:32,673 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:32,674 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-16 05:44:32,674 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:32,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-16 05:44:32,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-12-16 05:44:32,674 INFO L87 Difference]: Start difference. First operand 248 states and 314 transitions. Second operand has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-16 05:44:33,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:33,210 INFO L93 Difference]: Finished difference Result 267 states and 346 transitions. [2021-12-16 05:44:33,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-16 05:44:33,211 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2021-12-16 05:44:33,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:33,213 INFO L225 Difference]: With dead ends: 267 [2021-12-16 05:44:33,213 INFO L226 Difference]: Without dead ends: 267 [2021-12-16 05:44:33,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=27, Invalid=61, Unknown=2, NotChecked=0, Total=90 [2021-12-16 05:44:33,213 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 129 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:33,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 414 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 220 Invalid, 0 Unknown, 160 Unchecked, 0.5s Time] [2021-12-16 05:44:33,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-12-16 05:44:33,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 264. [2021-12-16 05:44:33,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 159 states have (on average 1.6415094339622642) internal successors, (261), 220 states have internal predecessors, (261), 31 states have call successors, (31), 9 states have call predecessors, (31), 12 states have return successors, (45), 34 states have call predecessors, (45), 31 states have call successors, (45) [2021-12-16 05:44:33,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 337 transitions. [2021-12-16 05:44:33,223 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 337 transitions. Word has length 35 [2021-12-16 05:44:33,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:33,224 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 337 transitions. [2021-12-16 05:44:33,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-12-16 05:44:33,224 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 337 transitions. [2021-12-16 05:44:33,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-16 05:44:33,228 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:33,228 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] [2021-12-16 05:44:33,250 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:33,443 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:33,635 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 [2021-12-16 05:44:33,636 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:33,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:33,636 INFO L85 PathProgramCache]: Analyzing trace with hash -599064084, now seen corresponding path program 1 times [2021-12-16 05:44:33,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:33,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2042332027] [2021-12-16 05:44:33,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:33,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:33,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:33,638 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) [2021-12-16 05:44:33,638 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-16 05:44:33,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:33,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-16 05:44:33,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:33,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:33,843 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 05:44:33,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:34,012 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 05:44:34,012 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:34,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2042332027] [2021-12-16 05:44:34,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2042332027] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 05:44:34,013 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:34,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-16 05:44:34,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216193244] [2021-12-16 05:44:34,013 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:34,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-16 05:44:34,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:34,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-16 05:44:34,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-12-16 05:44:34,014 INFO L87 Difference]: Start difference. First operand 264 states and 337 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) [2021-12-16 05:44:35,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:35,238 INFO L93 Difference]: Finished difference Result 304 states and 361 transitions. [2021-12-16 05:44:35,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-16 05:44:35,239 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 [2021-12-16 05:44:35,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:35,241 INFO L225 Difference]: With dead ends: 304 [2021-12-16 05:44:35,241 INFO L226 Difference]: Without dead ends: 304 [2021-12-16 05:44:35,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-12-16 05:44:35,242 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 217 mSDsluCounter, 754 mSDsCounter, 0 mSdLazyCounter, 1141 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 967 SdHoareTripleChecker+Invalid, 1288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:35,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 967 Invalid, 1288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1141 Invalid, 0 Unknown, 96 Unchecked, 1.1s Time] [2021-12-16 05:44:35,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-12-16 05:44:35,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 276. [2021-12-16 05:44:35,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 170 states have (on average 1.6235294117647059) internal successors, (276), 229 states have internal predecessors, (276), 33 states have call successors, (33), 10 states have call predecessors, (33), 13 states have return successors, (47), 36 states have call predecessors, (47), 33 states have call successors, (47) [2021-12-16 05:44:35,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 356 transitions. [2021-12-16 05:44:35,251 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 356 transitions. Word has length 25 [2021-12-16 05:44:35,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:35,251 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 356 transitions. [2021-12-16 05:44:35,252 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) [2021-12-16 05:44:35,252 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 356 transitions. [2021-12-16 05:44:35,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-12-16 05:44:35,253 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:35,253 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] [2021-12-16 05:44:35,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:35,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:35,462 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting minErr1REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:35,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:35,463 INFO L85 PathProgramCache]: Analyzing trace with hash -599064083, now seen corresponding path program 1 times [2021-12-16 05:44:35,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:35,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1039659792] [2021-12-16 05:44:35,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:35,463 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:35,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:35,464 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) [2021-12-16 05:44:35,465 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-16 05:44:35,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:35,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 05:44:35,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:35,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:35,747 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 05:44:35,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:36,483 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-16 05:44:36,484 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:36,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1039659792] [2021-12-16 05:44:36,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1039659792] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 05:44:36,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:36,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2021-12-16 05:44:36,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629459061] [2021-12-16 05:44:36,485 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:36,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-16 05:44:36,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:36,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-16 05:44:36,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-12-16 05:44:36,486 INFO L87 Difference]: Start difference. First operand 276 states and 356 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) [2021-12-16 05:44:39,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:39,203 INFO L93 Difference]: Finished difference Result 301 states and 392 transitions. [2021-12-16 05:44:39,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-16 05:44:39,204 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 [2021-12-16 05:44:39,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:39,206 INFO L225 Difference]: With dead ends: 301 [2021-12-16 05:44:39,206 INFO L226 Difference]: Without dead ends: 301 [2021-12-16 05:44:39,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2021-12-16 05:44:39,207 INFO L933 BasicCegarLoop]: 185 mSDtfsCounter, 126 mSDsluCounter, 927 mSDsCounter, 0 mSdLazyCounter, 1350 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 1112 SdHoareTripleChecker+Invalid, 1458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:39,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 1112 Invalid, 1458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 1350 Invalid, 0 Unknown, 64 Unchecked, 2.5s Time] [2021-12-16 05:44:39,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-12-16 05:44:39,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 292. [2021-12-16 05:44:39,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 182 states have (on average 1.598901098901099) internal successors, (291), 241 states have internal predecessors, (291), 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) [2021-12-16 05:44:39,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 377 transitions. [2021-12-16 05:44:39,219 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 377 transitions. Word has length 25 [2021-12-16 05:44:39,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:39,219 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 377 transitions. [2021-12-16 05:44:39,219 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) [2021-12-16 05:44:39,220 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 377 transitions. [2021-12-16 05:44:39,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-16 05:44:39,220 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:39,221 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] [2021-12-16 05:44:39,235 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:39,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:39,430 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting tree_inorderErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:39,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:39,430 INFO L85 PathProgramCache]: Analyzing trace with hash -1805510171, now seen corresponding path program 1 times [2021-12-16 05:44:39,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:39,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [211256183] [2021-12-16 05:44:39,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:39,431 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:39,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:39,432 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) [2021-12-16 05:44:39,435 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-16 05:44:39,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:39,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-16 05:44:39,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:39,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-16 05:44:39,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:39,572 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:39,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [211256183] [2021-12-16 05:44:39,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [211256183] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:39,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:39,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-16 05:44:39,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735735676] [2021-12-16 05:44:39,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:39,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-16 05:44:39,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:39,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-16 05:44:39,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-16 05:44:39,575 INFO L87 Difference]: Start difference. First operand 292 states and 377 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) [2021-12-16 05:44:39,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:39,591 INFO L93 Difference]: Finished difference Result 258 states and 309 transitions. [2021-12-16 05:44:39,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-16 05:44:39,592 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 [2021-12-16 05:44:39,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:39,593 INFO L225 Difference]: With dead ends: 258 [2021-12-16 05:44:39,594 INFO L226 Difference]: Without dead ends: 242 [2021-12-16 05:44:39,594 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 [2021-12-16 05:44:39,595 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 0 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 812 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 [2021-12-16 05:44:39,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 812 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-16 05:44:39,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-12-16 05:44:39,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 242. [2021-12-16 05:44:39,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 140 states have (on average 1.5642857142857143) internal successors, (219), 200 states have internal predecessors, (219), 29 states have call successors, (29), 9 states have call predecessors, (29), 13 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2021-12-16 05:44:39,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 293 transitions. [2021-12-16 05:44:39,616 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 293 transitions. Word has length 30 [2021-12-16 05:44:39,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:39,616 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 293 transitions. [2021-12-16 05:44:39,617 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) [2021-12-16 05:44:39,617 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 293 transitions. [2021-12-16 05:44:39,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-16 05:44:39,618 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:39,618 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] [2021-12-16 05:44:39,630 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:39,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:39,830 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting sizeErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:39,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:39,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1626172482, now seen corresponding path program 1 times [2021-12-16 05:44:39,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:39,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2142558307] [2021-12-16 05:44:39,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:39,831 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:39,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:39,832 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) [2021-12-16 05:44:39,833 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-16 05:44:39,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:39,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-16 05:44:39,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:40,022 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-16 05:44:40,022 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-16 05:44:40,022 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:40,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2142558307] [2021-12-16 05:44:40,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2142558307] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-16 05:44:40,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-16 05:44:40,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-16 05:44:40,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263269328] [2021-12-16 05:44:40,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-16 05:44:40,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-16 05:44:40,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:40,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-16 05:44:40,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-12-16 05:44:40,024 INFO L87 Difference]: Start difference. First operand 242 states and 293 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) [2021-12-16 05:44:40,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:40,218 INFO L93 Difference]: Finished difference Result 248 states and 302 transitions. [2021-12-16 05:44:40,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-16 05:44:40,218 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 [2021-12-16 05:44:40,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:40,220 INFO L225 Difference]: With dead ends: 248 [2021-12-16 05:44:40,220 INFO L226 Difference]: Without dead ends: 244 [2021-12-16 05:44:40,220 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 [2021-12-16 05:44:40,221 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 211 mSDsluCounter, 875 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 1061 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:40,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 1061 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-16 05:44:40,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-12-16 05:44:40,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 242. [2021-12-16 05:44:40,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 140 states have (on average 1.55) internal successors, (217), 200 states have internal predecessors, (217), 29 states have call successors, (29), 9 states have call predecessors, (29), 13 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2021-12-16 05:44:40,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 291 transitions. [2021-12-16 05:44:40,228 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 291 transitions. Word has length 31 [2021-12-16 05:44:40,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:40,228 INFO L470 AbstractCegarLoop]: Abstraction has 242 states and 291 transitions. [2021-12-16 05:44:40,228 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) [2021-12-16 05:44:40,229 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 291 transitions. [2021-12-16 05:44:40,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-16 05:44:40,229 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:40,230 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] [2021-12-16 05:44:40,239 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:40,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:40,438 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting minErr0REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:40,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:40,439 INFO L85 PathProgramCache]: Analyzing trace with hash -575590880, now seen corresponding path program 1 times [2021-12-16 05:44:40,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:40,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1641314563] [2021-12-16 05:44:40,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:40,440 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:40,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:40,441 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) [2021-12-16 05:44:40,443 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-12-16 05:44:40,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:40,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-12-16 05:44:40,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:40,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 05:44:40,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-16 05:44:40,673 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-12-16 05:44:40,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-12-16 05:44:40,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 05:44:40,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-12-16 05:44:40,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-16 05:44:40,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-12-16 05:44:40,942 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 05:44:40,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-16 05:44:41,598 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:41,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1641314563] [2021-12-16 05:44:41,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1641314563] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-16 05:44:41,598 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:41,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-12-16 05:44:41,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533023742] [2021-12-16 05:44:41,598 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:41,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-16 05:44:41,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:41,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-16 05:44:41,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-12-16 05:44:41,599 INFO L87 Difference]: Start difference. First operand 242 states and 291 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) [2021-12-16 05:44:42,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:42,398 INFO L93 Difference]: Finished difference Result 260 states and 315 transitions. [2021-12-16 05:44:42,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-16 05:44:42,398 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 [2021-12-16 05:44:42,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:42,402 INFO L225 Difference]: With dead ends: 260 [2021-12-16 05:44:42,402 INFO L226 Difference]: Without dead ends: 260 [2021-12-16 05:44:42,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-12-16 05:44:42,403 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 44 mSDsluCounter, 2208 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 2415 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:42,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 2415 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 358 Invalid, 0 Unknown, 86 Unchecked, 0.6s Time] [2021-12-16 05:44:42,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-12-16 05:44:42,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 249. [2021-12-16 05:44:42,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 145 states have (on average 1.5379310344827586) internal successors, (223), 205 states have internal predecessors, (223), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2021-12-16 05:44:42,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2021-12-16 05:44:42,414 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 31 [2021-12-16 05:44:42,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:42,415 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2021-12-16 05:44:42,415 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) [2021-12-16 05:44:42,415 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2021-12-16 05:44:42,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-16 05:44:42,417 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:42,417 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-12-16 05:44:42,431 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:42,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-16 05:44:42,628 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:42,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:42,628 INFO L85 PathProgramCache]: Analyzing trace with hash 698832763, now seen corresponding path program 1 times [2021-12-16 05:44:42,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:42,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [889281752] [2021-12-16 05:44:42,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:42,629 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:42,629 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:42,630 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) [2021-12-16 05:44:42,632 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-16 05:44:42,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:42,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 05:44:42,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:42,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:42,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:49,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 05:44:49,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-16 05:44:49,235 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-16 05:44:49,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-16 05:44:49,254 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 05:44:49,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:49,414 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:49,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [889281752] [2021-12-16 05:44:49,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [889281752] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:49,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2084130651] [2021-12-16 05:44:49,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:49,415 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-16 05:44:49,415 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-16 05:44:49,416 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) [2021-12-16 05:44:49,417 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-16 05:44:49,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:49,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-16 05:44:49,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:49,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:49,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:53,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-16 05:44:53,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-16 05:44:53,913 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-16 05:44:53,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 14 [2021-12-16 05:44:53,918 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-16 05:44:53,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:54,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2084130651] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:54,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:54,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-12-16 05:44:54,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231017611] [2021-12-16 05:44:54,061 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:54,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-16 05:44:54,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:54,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-16 05:44:54,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=51, Unknown=1, NotChecked=0, Total=72 [2021-12-16 05:44:54,062 INFO L87 Difference]: Start difference. First operand 249 states and 297 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) [2021-12-16 05:44:54,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:44:54,538 INFO L93 Difference]: Finished difference Result 254 states and 308 transitions. [2021-12-16 05:44:54,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-16 05:44:54,538 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 [2021-12-16 05:44:54,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:44:54,539 INFO L225 Difference]: With dead ends: 254 [2021-12-16 05:44:54,539 INFO L226 Difference]: Without dead ends: 254 [2021-12-16 05:44:54,539 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 [2021-12-16 05:44:54,540 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 115 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 159 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-16 05:44:54,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 464 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 342 Invalid, 0 Unknown, 159 Unchecked, 0.5s Time] [2021-12-16 05:44:54,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-12-16 05:44:54,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 250. [2021-12-16 05:44:54,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 146 states have (on average 1.5410958904109588) internal successors, (225), 205 states have internal predecessors, (225), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 33 states have call predecessors, (45), 29 states have call successors, (45) [2021-12-16 05:44:54,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 299 transitions. [2021-12-16 05:44:54,548 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 299 transitions. Word has length 45 [2021-12-16 05:44:54,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:44:54,548 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 299 transitions. [2021-12-16 05:44:54,548 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) [2021-12-16 05:44:54,548 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 299 transitions. [2021-12-16 05:44:54,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-16 05:44:54,549 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:44:54,549 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-12-16 05:44:54,561 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-12-16 05:44:54,763 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-12-16 05:44:54,961 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 [2021-12-16 05:44:54,961 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:44:54,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:44:54,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1655473609, now seen corresponding path program 1 times [2021-12-16 05:44:54,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:44:54,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1071759204] [2021-12-16 05:44:54,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:54,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:44:54,962 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:44:54,963 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) [2021-12-16 05:44:54,963 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-16 05:44:55,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:55,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-16 05:44:55,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:55,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:55,369 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-12-16 05:44:55,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 27 [2021-12-16 05:44:55,376 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 71 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-16 05:44:55,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:55,481 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:44:55,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1071759204] [2021-12-16 05:44:55,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1071759204] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:55,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1642531598] [2021-12-16 05:44:55,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-16 05:44:55,483 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-16 05:44:55,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-16 05:44:55,484 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) [2021-12-16 05:44:55,487 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-12-16 05:44:55,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-16 05:44:55,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-16 05:44:55,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:44:55,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:44:57,946 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-16 05:44:57,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 20 [2021-12-16 05:44:57,954 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 71 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-16 05:44:57,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:44:58,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1642531598] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:44:58,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-16 05:44:58,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-12-16 05:44:58,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758212969] [2021-12-16 05:44:58,055 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-16 05:44:58,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-16 05:44:58,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-16 05:44:58,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-16 05:44:58,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-12-16 05:44:58,057 INFO L87 Difference]: Start difference. First operand 250 states and 299 transitions. Second operand has 6 states, 5 states have (on average 7.0) internal successors, (35), 6 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-16 05:45:04,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-16 05:45:04,409 INFO L93 Difference]: Finished difference Result 253 states and 307 transitions. [2021-12-16 05:45:04,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-16 05:45:04,409 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 7.0) internal successors, (35), 6 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 55 [2021-12-16 05:45:04,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-16 05:45:04,410 INFO L225 Difference]: With dead ends: 253 [2021-12-16 05:45:04,410 INFO L226 Difference]: Without dead ends: 253 [2021-12-16 05:45:04,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 108 SyntacticMatches, 9 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-12-16 05:45:04,411 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 58 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 302 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-16 05:45:04,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 451 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 209 Invalid, 0 Unknown, 302 Unchecked, 0.3s Time] [2021-12-16 05:45:04,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2021-12-16 05:45:04,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 249. [2021-12-16 05:45:04,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 145 states have (on average 1.5379310344827586) internal successors, (223), 205 states have internal predecessors, (223), 29 states have call successors, (29), 11 states have call predecessors, (29), 15 states have return successors, (45), 32 states have call predecessors, (45), 29 states have call successors, (45) [2021-12-16 05:45:04,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 297 transitions. [2021-12-16 05:45:04,419 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 297 transitions. Word has length 55 [2021-12-16 05:45:04,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-16 05:45:04,419 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 297 transitions. [2021-12-16 05:45:04,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 7.0) internal successors, (35), 6 states have internal predecessors, (35), 4 states have call successors, (9), 2 states have call predecessors, (9), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-16 05:45:04,419 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 297 transitions. [2021-12-16 05:45:04,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-16 05:45:04,420 INFO L506 BasicCegarLoop]: Found error trace [2021-12-16 05:45:04,420 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-12-16 05:45:04,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-12-16 05:45:04,632 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-16 05:45:04,824 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 [2021-12-16 05:45:04,824 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [nondet_treeErr0REQUIRES_VIOLATION, nondet_treeErr1REQUIRES_VIOLATION, nondet_treeErr2REQUIRES_VIOLATION, nondet_treeErr3REQUIRES_VIOLATION (and 60 more)] === [2021-12-16 05:45:04,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-16 05:45:04,825 INFO L85 PathProgramCache]: Analyzing trace with hash -1380718298, now seen corresponding path program 2 times [2021-12-16 05:45:04,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-16 05:45:04,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [677263999] [2021-12-16 05:45:04,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 05:45:04,826 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-16 05:45:04,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-16 05:45:04,827 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) [2021-12-16 05:45:04,827 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-16 05:45:05,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 05:45:05,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 05:45:05,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-16 05:45:05,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:45:05,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-16 05:45:09,443 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-12-16 05:45:09,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 23 treesize of output 39 [2021-12-16 05:45:09,464 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-16 05:45:09,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-16 05:45:11,611 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-16 05:45:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [677263999] [2021-12-16 05:45:11,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [677263999] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-16 05:45:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1511811922] [2021-12-16 05:45:11,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 05:45:11,612 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-16 05:45:11,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-16 05:45:11,613 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-16 05:45:11,615 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-12-16 05:45:11,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-16 05:45:11,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671050204] [2021-12-16 05:45:11,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-16 05:45:11,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-16 05:45:11,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-16 05:45:11,829 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-16 05:45:11,830 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 1 [2021-12-16 05:45:11,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-16 05:45:12,005 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-16 05:45:12,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-16 05:45:12,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-16 05:45:12,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-16 05:45:12,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5