./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety/test-0137.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety/test-0137.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 16:30:32,166 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:30:32,167 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:30:32,189 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:30:32,192 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:30:32,195 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:30:32,197 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:30:32,201 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:30:32,203 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:30:32,208 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:30:32,208 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:30:32,209 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:30:32,209 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:30:32,212 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:30:32,213 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:30:32,214 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:30:32,215 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:30:32,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:30:32,219 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:30:32,220 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:30:32,224 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:30:32,224 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:30:32,225 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:30:32,226 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:30:32,229 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:30:32,229 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:30:32,229 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:30:32,230 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:30:32,231 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:30:32,231 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:30:32,232 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:30:32,232 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:30:32,233 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:30:32,234 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:30:32,235 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:30:32,235 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:30:32,236 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:30:32,236 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:30:32,236 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:30:32,236 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:30:32,237 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:30:32,237 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-12-22 16:30:32,261 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:30:32,262 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:30:32,262 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:30:32,262 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:30:32,263 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:30:32,263 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:30:32,264 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:30:32,264 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:30:32,264 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:30:32,264 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:30:32,265 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:30:32,265 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:30:32,265 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:30:32,265 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:30:32,265 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:30:32,266 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:30:32,267 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:30:32,267 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:30:32,267 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:30:32,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:30:32,267 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:30:32,268 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:30:32,268 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 16:30:32,268 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 16:30:32,269 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:30:32,269 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a [2021-12-22 16:30:32,506 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:30:32,525 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:30:32,527 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:30:32,528 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:30:32,529 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:30:32,529 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0137.i [2021-12-22 16:30:32,583 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/147666698/99f45e6c885b44a7b2d4b74aea1d9506/FLAGa06cfea8f [2021-12-22 16:30:32,969 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:30:32,969 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0137.i [2021-12-22 16:30:32,985 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/147666698/99f45e6c885b44a7b2d4b74aea1d9506/FLAGa06cfea8f [2021-12-22 16:30:32,996 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/147666698/99f45e6c885b44a7b2d4b74aea1d9506 [2021-12-22 16:30:32,999 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:30:33,000 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:30:33,002 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:30:33,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:30:33,004 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:30:33,005 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:30:32" (1/1) ... [2021-12-22 16:30:33,006 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3684165c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:33, skipping insertion in model container [2021-12-22 16:30:33,006 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:30:32" (1/1) ... [2021-12-22 16:30:33,010 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:30:33,049 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:30:33,289 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:30:33,299 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-12-22 16:30:33,301 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@14186b30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:33, skipping insertion in model container [2021-12-22 16:30:33,301 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:30:33,301 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-12-22 16:30:33,304 INFO L158 Benchmark]: Toolchain (without parser) took 302.05ms. Allocated memory was 94.4MB in the beginning and 113.2MB in the end (delta: 18.9MB). Free memory was 52.4MB in the beginning and 83.9MB in the end (delta: -31.5MB). Peak memory consumption was 6.5MB. Max. memory is 16.1GB. [2021-12-22 16:30:33,305 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 94.4MB. Free memory is still 70.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 16:30:33,306 INFO L158 Benchmark]: CACSL2BoogieTranslator took 299.91ms. Allocated memory was 94.4MB in the beginning and 113.2MB in the end (delta: 18.9MB). Free memory was 52.2MB in the beginning and 83.9MB in the end (delta: -31.7MB). Peak memory consumption was 6.5MB. Max. memory is 16.1GB. [2021-12-22 16:30:33,308 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 94.4MB. Free memory is still 70.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 299.91ms. Allocated memory was 94.4MB in the beginning and 113.2MB in the end (delta: 18.9MB). Free memory was 52.2MB in the beginning and 83.9MB in the end (delta: -31.7MB). Peak memory consumption was 6.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 585]: 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/memsafety/test-0137.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-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-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 16:30:34,943 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 16:30:34,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 16:30:34,964 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 16:30:34,965 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 16:30:34,966 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 16:30:34,967 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 16:30:34,968 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 16:30:34,969 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 16:30:34,969 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 16:30:34,970 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 16:30:34,971 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 16:30:34,971 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 16:30:34,972 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 16:30:34,973 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 16:30:34,973 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 16:30:34,974 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 16:30:34,974 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 16:30:34,976 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 16:30:34,977 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 16:30:34,978 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 16:30:34,979 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 16:30:34,980 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 16:30:34,980 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 16:30:34,982 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 16:30:34,982 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 16:30:34,983 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 16:30:34,983 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 16:30:34,984 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 16:30:34,984 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 16:30:34,991 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 16:30:34,992 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 16:30:34,992 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 16:30:34,993 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 16:30:34,993 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 16:30:34,994 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 16:30:34,994 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 16:30:34,994 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 16:30:34,994 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 16:30:34,995 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 16:30:34,995 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 16:30:34,996 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-12-22 16:30:35,011 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 16:30:35,011 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 16:30:35,011 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 16:30:35,011 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 16:30:35,012 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 16:30:35,012 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 16:30:35,013 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 16:30:35,013 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 16:30:35,013 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 16:30:35,013 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 16:30:35,013 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 16:30:35,013 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-12-22 16:30:35,013 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 16:30:35,014 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-12-22 16:30:35,015 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-12-22 16:30:35,015 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-12-22 16:30:35,015 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 16:30:35,015 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 16:30:35,015 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 16:30:35,016 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 16:30:35,016 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 16:30:35,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:30:35,016 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 16:30:35,017 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 16:30:35,017 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-12-22 16:30:35,017 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-12-22 16:30:35,017 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 16:30:35,017 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-12-22 16:30:35,017 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1c2d362b3c58f37a9b1e964b448eb3d54c85d26676417295a73853b3a7cc716a [2021-12-22 16:30:35,427 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 16:30:35,440 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 16:30:35,442 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 16:30:35,442 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 16:30:35,443 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 16:30:35,444 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety/test-0137.i [2021-12-22 16:30:35,499 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b58b60dd1/de1cd1a84fb349b6bebe5d287a23c44a/FLAG7bfacc154 [2021-12-22 16:30:35,947 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 16:30:35,947 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety/test-0137.i [2021-12-22 16:30:35,968 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b58b60dd1/de1cd1a84fb349b6bebe5d287a23c44a/FLAG7bfacc154 [2021-12-22 16:30:36,478 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b58b60dd1/de1cd1a84fb349b6bebe5d287a23c44a [2021-12-22 16:30:36,480 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 16:30:36,482 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 16:30:36,485 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 16:30:36,485 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 16:30:36,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 16:30:36,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37e3885f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36, skipping insertion in model container [2021-12-22 16:30:36,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 16:30:36,530 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:30:36,802 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:30:36,812 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-12-22 16:30:36,818 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 16:30:36,858 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:30:36,866 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 16:30:36,887 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 16:30:36,908 INFO L208 MainTranslator]: Completed translation [2021-12-22 16:30:36,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36 WrapperNode [2021-12-22 16:30:36,909 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 16:30:36,910 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 16:30:36,910 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 16:30:36,910 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 16:30:36,915 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,956 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,981 INFO L137 Inliner]: procedures = 140, calls = 60, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 137 [2021-12-22 16:30:36,982 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 16:30:36,982 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 16:30:36,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 16:30:36,983 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 16:30:36,988 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,989 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:36,995 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:37,008 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:37,011 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:37,013 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:37,015 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 16:30:37,015 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 16:30:37,016 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 16:30:37,016 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 16:30:37,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (1/1) ... [2021-12-22 16:30:37,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 16:30:37,028 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 16:30:37,048 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 16:30:37,072 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 16:30:37,083 INFO L130 BoogieDeclarations]: Found specification of procedure list_empty [2021-12-22 16:30:37,084 INFO L138 BoogieDeclarations]: Found implementation of procedure list_empty [2021-12-22 16:30:37,084 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-12-22 16:30:37,084 INFO L130 BoogieDeclarations]: Found specification of procedure __list_del [2021-12-22 16:30:37,084 INFO L138 BoogieDeclarations]: Found implementation of procedure __list_del [2021-12-22 16:30:37,084 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 16:30:37,084 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 16:30:37,084 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 16:30:37,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 16:30:37,085 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 16:30:37,085 INFO L130 BoogieDeclarations]: Found specification of procedure list_add [2021-12-22 16:30:37,085 INFO L138 BoogieDeclarations]: Found implementation of procedure list_add [2021-12-22 16:30:37,085 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 16:30:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-12-22 16:30:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-12-22 16:30:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-12-22 16:30:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure val_from_node [2021-12-22 16:30:37,086 INFO L138 BoogieDeclarations]: Found implementation of procedure val_from_node [2021-12-22 16:30:37,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 16:30:37,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 16:30:37,175 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 16:30:37,176 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 16:30:37,677 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 16:30:37,682 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 16:30:37,682 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-22 16:30:37,683 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:30:37 BoogieIcfgContainer [2021-12-22 16:30:37,683 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 16:30:37,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 16:30:37,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 16:30:37,686 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 16:30:37,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:30:36" (1/3) ... [2021-12-22 16:30:37,687 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd06f55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:30:37, skipping insertion in model container [2021-12-22 16:30:37,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:30:36" (2/3) ... [2021-12-22 16:30:37,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bd06f55 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:30:37, skipping insertion in model container [2021-12-22 16:30:37,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:30:37" (3/3) ... [2021-12-22 16:30:37,691 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0137.i [2021-12-22 16:30:37,695 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 16:30:37,695 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 56 error locations. [2021-12-22 16:30:37,731 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 16:30:37,737 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 16:30:37,738 INFO L340 AbstractCegarLoop]: Starting to check reachability of 56 error locations. [2021-12-22 16:30:37,751 INFO L276 IsEmpty]: Start isEmpty. Operand has 141 states, 73 states have (on average 1.9315068493150684) internal successors, (141), 129 states have internal predecessors, (141), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:37,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:30:37,755 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:37,756 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:30:37,756 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:37,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:37,760 INFO L85 PathProgramCache]: Analyzing trace with hash 66866992, now seen corresponding path program 1 times [2021-12-22 16:30:37,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:37,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [156815734] [2021-12-22 16:30:37,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:37,769 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:37,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:37,797 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:37,798 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-12-22 16:30:37,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:37,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 1 conjunts are in the unsatisfiable core [2021-12-22 16:30:37,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:37,892 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:37,892 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:37,893 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:37,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [156815734] [2021-12-22 16:30:37,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [156815734] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:37,894 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:37,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:30:37,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203660036] [2021-12-22 16:30:37,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:37,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-22 16:30:37,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:37,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-22 16:30:37,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:30:37,922 INFO L87 Difference]: Start difference. First operand has 141 states, 73 states have (on average 1.9315068493150684) internal successors, (141), 129 states have internal predecessors, (141), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:37,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:37,948 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-12-22 16:30:37,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-22 16:30:37,950 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-22 16:30:37,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:37,957 INFO L225 Difference]: With dead ends: 141 [2021-12-22 16:30:37,957 INFO L226 Difference]: Without dead ends: 139 [2021-12-22 16:30:37,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-22 16:30:37,962 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:37,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 16:30:37,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-22 16:30:37,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-12-22 16:30:37,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 72 states have (on average 1.8611111111111112) internal successors, (134), 127 states have internal predecessors, (134), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:38,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 148 transitions. [2021-12-22 16:30:38,007 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 148 transitions. Word has length 5 [2021-12-22 16:30:38,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:38,007 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 148 transitions. [2021-12-22 16:30:38,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:38,008 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 148 transitions. [2021-12-22 16:30:38,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:30:38,008 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:38,009 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:30:38,022 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:38,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:38,218 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:38,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:38,218 INFO L85 PathProgramCache]: Analyzing trace with hash 66867054, now seen corresponding path program 1 times [2021-12-22 16:30:38,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:38,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1655847491] [2021-12-22 16:30:38,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:38,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:38,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:38,220 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:38,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-12-22 16:30:38,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:38,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 3 conjunts are in the unsatisfiable core [2021-12-22 16:30:38,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:38,319 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:38,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:38,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:38,335 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:38,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1655847491] [2021-12-22 16:30:38,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1655847491] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:38,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:38,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:30:38,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790913868] [2021-12-22 16:30:38,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:38,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:30:38,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:38,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:30:38,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:30:38,344 INFO L87 Difference]: Start difference. First operand 139 states and 148 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:38,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:38,512 INFO L93 Difference]: Finished difference Result 161 states and 170 transitions. [2021-12-22 16:30:38,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:30:38,513 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-22 16:30:38,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:38,514 INFO L225 Difference]: With dead ends: 161 [2021-12-22 16:30:38,514 INFO L226 Difference]: Without dead ends: 161 [2021-12-22 16:30:38,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:30:38,515 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 87 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:38,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 141 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:30:38,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-12-22 16:30:38,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 138. [2021-12-22 16:30:38,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 72 states have (on average 1.8472222222222223) internal successors, (133), 126 states have internal predecessors, (133), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:38,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 147 transitions. [2021-12-22 16:30:38,521 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 147 transitions. Word has length 5 [2021-12-22 16:30:38,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:38,521 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 147 transitions. [2021-12-22 16:30:38,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:38,522 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 147 transitions. [2021-12-22 16:30:38,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-12-22 16:30:38,522 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:38,522 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-12-22 16:30:38,529 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:38,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:38,728 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:38,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:38,729 INFO L85 PathProgramCache]: Analyzing trace with hash 66867055, now seen corresponding path program 1 times [2021-12-22 16:30:38,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:38,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [389440431] [2021-12-22 16:30:38,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:38,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:38,729 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:38,731 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:38,732 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-12-22 16:30:38,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:38,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:30:38,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:38,781 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:38,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:38,794 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:38,795 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:38,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [389440431] [2021-12-22 16:30:38,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [389440431] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:38,795 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:38,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-22 16:30:38,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987417673] [2021-12-22 16:30:38,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:38,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-22 16:30:38,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:38,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-22 16:30:38,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:30:38,812 INFO L87 Difference]: Start difference. First operand 138 states and 147 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:38,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:38,971 INFO L93 Difference]: Finished difference Result 160 states and 169 transitions. [2021-12-22 16:30:38,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 16:30:38,971 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-12-22 16:30:38,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:38,972 INFO L225 Difference]: With dead ends: 160 [2021-12-22 16:30:38,972 INFO L226 Difference]: Without dead ends: 160 [2021-12-22 16:30:38,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-22 16:30:38,973 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 28 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:38,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 219 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:30:38,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-22 16:30:38,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 137. [2021-12-22 16:30:38,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 72 states have (on average 1.8333333333333333) internal successors, (132), 125 states have internal predecessors, (132), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:38,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 146 transitions. [2021-12-22 16:30:38,978 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 146 transitions. Word has length 5 [2021-12-22 16:30:38,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:38,978 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 146 transitions. [2021-12-22 16:30:38,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:38,978 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 146 transitions. [2021-12-22 16:30:38,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-22 16:30:38,978 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:38,978 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:38,989 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:39,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:39,187 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting list_addErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:39,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:39,187 INFO L85 PathProgramCache]: Analyzing trace with hash -828252735, now seen corresponding path program 1 times [2021-12-22 16:30:39,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:39,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1501368146] [2021-12-22 16:30:39,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:39,188 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:39,188 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:39,190 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:39,191 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-12-22 16:30:39,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:39,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 16:30:39,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:39,341 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:30:39,341 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-22 16:30:39,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:39,381 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:39,381 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:39,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1501368146] [2021-12-22 16:30:39,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1501368146] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:39,381 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:39,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:30:39,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215835034] [2021-12-22 16:30:39,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:39,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:30:39,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:39,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:30:39,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:30:39,383 INFO L87 Difference]: Start difference. First operand 137 states and 146 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:39,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:39,682 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2021-12-22 16:30:39,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:30:39,683 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 8 [2021-12-22 16:30:39,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:39,684 INFO L225 Difference]: With dead ends: 173 [2021-12-22 16:30:39,684 INFO L226 Difference]: Without dead ends: 173 [2021-12-22 16:30:39,684 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:30:39,684 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 185 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:39,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 216 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:39,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-12-22 16:30:39,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 150. [2021-12-22 16:30:39,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 87 states have (on average 1.8160919540229885) internal successors, (158), 137 states have internal predecessors, (158), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:39,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 172 transitions. [2021-12-22 16:30:39,700 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 172 transitions. Word has length 8 [2021-12-22 16:30:39,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:39,700 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 172 transitions. [2021-12-22 16:30:39,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:39,700 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 172 transitions. [2021-12-22 16:30:39,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-12-22 16:30:39,701 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:39,701 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:39,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:39,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:39,908 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting list_addErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:39,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:39,908 INFO L85 PathProgramCache]: Analyzing trace with hash -828252734, now seen corresponding path program 1 times [2021-12-22 16:30:39,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:39,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [570719283] [2021-12-22 16:30:39,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:39,909 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:39,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:39,910 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:39,911 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-12-22 16:30:39,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:39,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 16:30:39,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:40,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:30:40,029 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:30:40,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:40,087 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:40,087 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:40,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [570719283] [2021-12-22 16:30:40,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [570719283] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:40,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:40,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:30:40,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121377449] [2021-12-22 16:30:40,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:40,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:30:40,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:40,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:30:40,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:30:40,089 INFO L87 Difference]: Start difference. First operand 150 states and 172 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:40,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:40,437 INFO L93 Difference]: Finished difference Result 152 states and 163 transitions. [2021-12-22 16:30:40,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:30:40,438 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 8 [2021-12-22 16:30:40,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:40,438 INFO L225 Difference]: With dead ends: 152 [2021-12-22 16:30:40,438 INFO L226 Difference]: Without dead ends: 152 [2021-12-22 16:30:40,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:30:40,439 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 182 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:40,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 148 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:40,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-12-22 16:30:40,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 140. [2021-12-22 16:30:40,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 83 states have (on average 1.7108433734939759) internal successors, (142), 127 states have internal predecessors, (142), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-22 16:30:40,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 156 transitions. [2021-12-22 16:30:40,444 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 156 transitions. Word has length 8 [2021-12-22 16:30:40,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:40,445 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 156 transitions. [2021-12-22 16:30:40,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:40,445 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 156 transitions. [2021-12-22 16:30:40,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:30:40,445 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:40,445 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:40,454 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:40,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:40,657 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting list_addErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:40,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:40,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1381928766, now seen corresponding path program 1 times [2021-12-22 16:30:40,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:40,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1248646092] [2021-12-22 16:30:40,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:40,658 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:40,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:40,659 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:40,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-12-22 16:30:40,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:40,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-22 16:30:40,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:40,786 INFO L353 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2021-12-22 16:30:40,787 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 14 [2021-12-22 16:30:40,824 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:30:40,875 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:30:40,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:40,900 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:40,901 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:40,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1248646092] [2021-12-22 16:30:40,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1248646092] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:40,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:40,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:30:40,901 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378296313] [2021-12-22 16:30:40,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:40,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 16:30:40,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:40,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 16:30:40,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-22 16:30:40,903 INFO L87 Difference]: Start difference. First operand 140 states and 156 transitions. Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:41,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:41,348 INFO L93 Difference]: Finished difference Result 161 states and 177 transitions. [2021-12-22 16:30:41,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:30:41,348 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 10 [2021-12-22 16:30:41,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:41,350 INFO L225 Difference]: With dead ends: 161 [2021-12-22 16:30:41,350 INFO L226 Difference]: Without dead ends: 161 [2021-12-22 16:30:41,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:30:41,351 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 41 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:41,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 579 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:41,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-12-22 16:30:41,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 154. [2021-12-22 16:30:41,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 95 states have (on average 1.694736842105263) internal successors, (161), 140 states have internal predecessors, (161), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:41,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 177 transitions. [2021-12-22 16:30:41,355 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 177 transitions. Word has length 10 [2021-12-22 16:30:41,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:41,362 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 177 transitions. [2021-12-22 16:30:41,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:41,362 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 177 transitions. [2021-12-22 16:30:41,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-22 16:30:41,363 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:41,363 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:41,370 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:41,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:41,570 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting list_addErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:41,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:41,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1381928765, now seen corresponding path program 1 times [2021-12-22 16:30:41,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:41,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1871939354] [2021-12-22 16:30:41,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:41,572 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:41,572 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:41,574 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:41,580 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-12-22 16:30:41,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:41,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 16:30:41,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:41,795 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:30:41,795 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:30:41,801 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-12-22 16:30:41,853 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:30:41,858 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:30:41,953 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:30:41,964 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:30:41,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:41,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:41,999 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:41,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1871939354] [2021-12-22 16:30:41,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1871939354] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:41,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:41,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-22 16:30:41,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679674002] [2021-12-22 16:30:41,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:42,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-22 16:30:42,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:42,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-22 16:30:42,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-22 16:30:42,000 INFO L87 Difference]: Start difference. First operand 154 states and 177 transitions. Second operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:42,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:42,750 INFO L93 Difference]: Finished difference Result 160 states and 176 transitions. [2021-12-22 16:30:42,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-22 16:30:42,751 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 10 [2021-12-22 16:30:42,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:42,751 INFO L225 Difference]: With dead ends: 160 [2021-12-22 16:30:42,752 INFO L226 Difference]: Without dead ends: 160 [2021-12-22 16:30:42,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-12-22 16:30:42,752 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 39 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:42,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 672 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:30:42,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-22 16:30:42,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 154. [2021-12-22 16:30:42,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 95 states have (on average 1.6842105263157894) internal successors, (160), 140 states have internal predecessors, (160), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:42,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 176 transitions. [2021-12-22 16:30:42,757 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 176 transitions. Word has length 10 [2021-12-22 16:30:42,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:42,757 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 176 transitions. [2021-12-22 16:30:42,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:42,758 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 176 transitions. [2021-12-22 16:30:42,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:30:42,758 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:42,758 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:42,767 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:42,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:42,966 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting list_addErr4REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:42,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:42,966 INFO L85 PathProgramCache]: Analyzing trace with hash 109881212, now seen corresponding path program 1 times [2021-12-22 16:30:42,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:42,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1504055212] [2021-12-22 16:30:42,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:42,966 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:42,966 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:42,968 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:42,969 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-12-22 16:30:43,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:43,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-22 16:30:43,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:43,036 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:43,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:43,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:43,067 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:43,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1504055212] [2021-12-22 16:30:43,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1504055212] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:43,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:43,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:30:43,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810450399] [2021-12-22 16:30:43,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:43,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:30:43,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:43,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:30:43,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:30:43,068 INFO L87 Difference]: Start difference. First operand 154 states and 176 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:43,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:43,372 INFO L93 Difference]: Finished difference Result 175 states and 187 transitions. [2021-12-22 16:30:43,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 16:30:43,372 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2021-12-22 16:30:43,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:43,373 INFO L225 Difference]: With dead ends: 175 [2021-12-22 16:30:43,373 INFO L226 Difference]: Without dead ends: 175 [2021-12-22 16:30:43,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:30:43,373 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 121 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:43,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 306 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:43,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-12-22 16:30:43,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 153. [2021-12-22 16:30:43,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 95 states have (on average 1.631578947368421) internal successors, (155), 139 states have internal predecessors, (155), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:43,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 171 transitions. [2021-12-22 16:30:43,385 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 171 transitions. Word has length 11 [2021-12-22 16:30:43,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:43,385 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 171 transitions. [2021-12-22 16:30:43,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:43,385 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 171 transitions. [2021-12-22 16:30:43,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-22 16:30:43,386 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:43,386 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:43,393 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:43,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:43,593 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting list_addErr5REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:43,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:43,593 INFO L85 PathProgramCache]: Analyzing trace with hash 109881213, now seen corresponding path program 1 times [2021-12-22 16:30:43,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:43,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1550127073] [2021-12-22 16:30:43,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:43,593 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:43,594 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:43,595 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:43,596 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-12-22 16:30:43,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:43,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-22 16:30:43,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:43,711 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:43,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:43,770 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:43,770 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:43,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1550127073] [2021-12-22 16:30:43,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1550127073] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:43,770 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:43,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:30:43,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773551618] [2021-12-22 16:30:43,770 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:43,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-22 16:30:43,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:43,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-22 16:30:43,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:30:43,772 INFO L87 Difference]: Start difference. First operand 153 states and 171 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:44,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:44,068 INFO L93 Difference]: Finished difference Result 175 states and 185 transitions. [2021-12-22 16:30:44,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 16:30:44,068 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2021-12-22 16:30:44,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:44,069 INFO L225 Difference]: With dead ends: 175 [2021-12-22 16:30:44,069 INFO L226 Difference]: Without dead ends: 175 [2021-12-22 16:30:44,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:30:44,070 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 57 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:44,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 433 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:44,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-12-22 16:30:44,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 153. [2021-12-22 16:30:44,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 95 states have (on average 1.5894736842105264) internal successors, (151), 139 states have internal predecessors, (151), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:44,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 167 transitions. [2021-12-22 16:30:44,073 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 167 transitions. Word has length 11 [2021-12-22 16:30:44,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:44,073 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 167 transitions. [2021-12-22 16:30:44,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:44,073 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 167 transitions. [2021-12-22 16:30:44,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-22 16:30:44,074 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:44,074 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:44,096 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:44,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:44,283 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting list_addErr8REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:44,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:44,283 INFO L85 PathProgramCache]: Analyzing trace with hash -1778337633, now seen corresponding path program 1 times [2021-12-22 16:30:44,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:44,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [740585500] [2021-12-22 16:30:44,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:44,284 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:44,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:44,285 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:44,287 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-12-22 16:30:44,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:44,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-22 16:30:44,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:44,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:44,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:44,425 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:44,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [740585500] [2021-12-22 16:30:44,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [740585500] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:44,426 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:44,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-22 16:30:44,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663294353] [2021-12-22 16:30:44,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:44,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-22 16:30:44,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:44,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-22 16:30:44,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-22 16:30:44,428 INFO L87 Difference]: Start difference. First operand 153 states and 167 transitions. Second operand has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:44,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:44,544 INFO L93 Difference]: Finished difference Result 152 states and 164 transitions. [2021-12-22 16:30:44,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-22 16:30:44,544 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 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 13 [2021-12-22 16:30:44,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:44,545 INFO L225 Difference]: With dead ends: 152 [2021-12-22 16:30:44,545 INFO L226 Difference]: Without dead ends: 152 [2021-12-22 16:30:44,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:30:44,546 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 22 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:44,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 271 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 16:30:44,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-12-22 16:30:44,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-12-22 16:30:44,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 95 states have (on average 1.5578947368421052) internal successors, (148), 138 states have internal predecessors, (148), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:44,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 164 transitions. [2021-12-22 16:30:44,550 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 164 transitions. Word has length 13 [2021-12-22 16:30:44,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:44,550 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 164 transitions. [2021-12-22 16:30:44,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:44,551 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 164 transitions. [2021-12-22 16:30:44,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-22 16:30:44,552 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:44,552 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:44,577 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:44,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:44,760 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting list_addErr9REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:44,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:44,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1778337632, now seen corresponding path program 1 times [2021-12-22 16:30:44,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:44,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1661249197] [2021-12-22 16:30:44,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:44,761 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:44,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:44,762 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:44,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-12-22 16:30:44,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:44,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-22 16:30:44,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:44,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:44,988 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:44,988 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:44,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1661249197] [2021-12-22 16:30:44,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1661249197] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:44,989 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:44,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 16:30:44,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164305479] [2021-12-22 16:30:44,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:44,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:30:44,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:44,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:30:44,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:30:44,990 INFO L87 Difference]: Start difference. First operand 152 states and 164 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:45,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:45,360 INFO L93 Difference]: Finished difference Result 154 states and 162 transitions. [2021-12-22 16:30:45,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-22 16:30:45,361 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 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 13 [2021-12-22 16:30:45,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:45,362 INFO L225 Difference]: With dead ends: 154 [2021-12-22 16:30:45,362 INFO L226 Difference]: Without dead ends: 154 [2021-12-22 16:30:45,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-12-22 16:30:45,363 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 166 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:45,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 521 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:45,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-12-22 16:30:45,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 152. [2021-12-22 16:30:45,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 95 states have (on average 1.5368421052631578) internal successors, (146), 138 states have internal predecessors, (146), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:45,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 162 transitions. [2021-12-22 16:30:45,366 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 162 transitions. Word has length 13 [2021-12-22 16:30:45,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:45,366 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 162 transitions. [2021-12-22 16:30:45,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-22 16:30:45,366 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 162 transitions. [2021-12-22 16:30:45,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-22 16:30:45,366 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:45,366 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] [2021-12-22 16:30:45,376 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-12-22 16:30:45,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:45,567 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting list_emptyErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:45,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:45,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1358598366, now seen corresponding path program 1 times [2021-12-22 16:30:45,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:45,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [550706113] [2021-12-22 16:30:45,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:45,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:45,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:45,570 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:45,571 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-12-22 16:30:45,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:45,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-22 16:30:45,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:45,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:45,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:45,786 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:45,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [550706113] [2021-12-22 16:30:45,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [550706113] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:45,786 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:45,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:30:45,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14981096] [2021-12-22 16:30:45,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:45,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-22 16:30:45,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:45,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-22 16:30:45,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-12-22 16:30:45,787 INFO L87 Difference]: Start difference. First operand 152 states and 162 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:30:46,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:46,141 INFO L93 Difference]: Finished difference Result 151 states and 161 transitions. [2021-12-22 16:30:46,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:30:46,141 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 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 22 [2021-12-22 16:30:46,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:46,142 INFO L225 Difference]: With dead ends: 151 [2021-12-22 16:30:46,142 INFO L226 Difference]: Without dead ends: 151 [2021-12-22 16:30:46,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:30:46,143 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 156 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:46,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 309 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-22 16:30:46,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-12-22 16:30:46,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-12-22 16:30:46,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 95 states have (on average 1.5263157894736843) internal successors, (145), 137 states have internal predecessors, (145), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:46,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 161 transitions. [2021-12-22 16:30:46,146 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 161 transitions. Word has length 22 [2021-12-22 16:30:46,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:46,146 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 161 transitions. [2021-12-22 16:30:46,146 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:30:46,146 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 161 transitions. [2021-12-22 16:30:46,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-22 16:30:46,147 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:46,147 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] [2021-12-22 16:30:46,170 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:46,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:46,355 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting list_emptyErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:46,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:46,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1358598367, now seen corresponding path program 1 times [2021-12-22 16:30:46,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:46,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1049872629] [2021-12-22 16:30:46,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:46,356 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:46,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:46,357 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:46,358 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-12-22 16:30:46,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:46,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-22 16:30:46,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:46,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:46,608 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:30:46,608 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:46,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1049872629] [2021-12-22 16:30:46,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1049872629] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:30:46,608 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:30:46,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-22 16:30:46,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676295207] [2021-12-22 16:30:46,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:30:46,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 16:30:46,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:46,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 16:30:46,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-12-22 16:30:46,609 INFO L87 Difference]: Start difference. First operand 151 states and 161 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:30:47,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:47,153 INFO L93 Difference]: Finished difference Result 150 states and 160 transitions. [2021-12-22 16:30:47,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 16:30:47,154 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 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 22 [2021-12-22 16:30:47,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:47,155 INFO L225 Difference]: With dead ends: 150 [2021-12-22 16:30:47,155 INFO L226 Difference]: Without dead ends: 150 [2021-12-22 16:30:47,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-12-22 16:30:47,156 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 253 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:47,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 316 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 16:30:47,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-12-22 16:30:47,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2021-12-22 16:30:47,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 95 states have (on average 1.5157894736842106) internal successors, (144), 136 states have internal predecessors, (144), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:47,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 160 transitions. [2021-12-22 16:30:47,159 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 160 transitions. Word has length 22 [2021-12-22 16:30:47,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:47,160 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 160 transitions. [2021-12-22 16:30:47,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-22 16:30:47,160 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 160 transitions. [2021-12-22 16:30:47,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 16:30:47,160 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:47,160 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:47,171 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-12-22 16:30:47,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:47,375 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting list_addErr2REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:47,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:47,376 INFO L85 PathProgramCache]: Analyzing trace with hash -868531821, now seen corresponding path program 1 times [2021-12-22 16:30:47,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:47,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [586961670] [2021-12-22 16:30:47,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:47,376 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:47,377 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:47,377 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:47,379 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-12-22 16:30:47,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:47,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-22 16:30:47,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:47,571 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:47,705 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:30:47,797 INFO L353 Elim1Store]: treesize reduction 54, result has 37.9 percent of original size [2021-12-22 16:30:47,797 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 29 treesize of output 50 [2021-12-22 16:30:47,875 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-12-22 16:30:48,023 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 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 26 treesize of output 14 [2021-12-22 16:30:48,166 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:48,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:30:48,344 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_345 (Array (_ BitVec 32) (_ BitVec 32))) (|v_ULTIMATE.start_gl_insert_~node~0#1.base_10| (_ BitVec 32))) (or (not (= (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10|) (_ bv0 1))) (= (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10| (_ bv1 1)) (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_10| v_ArrVal_345) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (_ bv1 1)))) is different from false [2021-12-22 16:30:48,571 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:30:48,572 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-22 16:30:48,575 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:30:48,577 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-12-22 16:30:48,663 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:48,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [586961670] [2021-12-22 16:30:48,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [586961670] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:30:48,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [649373229] [2021-12-22 16:30:48,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:48,664 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:30:48,664 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:30:48,666 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:30:48,685 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-12-22 16:30:49,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:49,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-22 16:30:49,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:49,097 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-22 16:30:49,098 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 17 [2021-12-22 16:30:49,436 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:30:49,628 INFO L353 Elim1Store]: treesize reduction 81, result has 35.7 percent of original size [2021-12-22 16:30:49,628 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 39 treesize of output 70 [2021-12-22 16:30:49,742 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 28 [2021-12-22 16:30:49,899 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-12-22 16:30:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:49,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:30:50,053 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_gl_insert_~node~0#1.base_12| (_ BitVec 32)) (v_ArrVal_345 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_409 (_ BitVec 1))) (or (= (select (store |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12| v_ArrVal_409) (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12| v_ArrVal_345) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (_ bv1 1)) (not (= (select |c_#valid| |v_ULTIMATE.start_gl_insert_~node~0#1.base_12|) (_ bv0 1))))) is different from false [2021-12-22 16:30:50,199 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:30:50,199 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-12-22 16:30:50,201 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:30:50,202 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 13 [2021-12-22 16:30:52,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [649373229] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:30:52,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:30:52,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 26 [2021-12-22 16:30:52,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286470530] [2021-12-22 16:30:52,246 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:30:52,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 16:30:52,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:30:52,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 16:30:52,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1044, Unknown=8, NotChecked=134, Total=1332 [2021-12-22 16:30:52,248 INFO L87 Difference]: Start difference. First operand 150 states and 160 transitions. Second operand has 27 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:30:52,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:30:52,673 INFO L93 Difference]: Finished difference Result 150 states and 159 transitions. [2021-12-22 16:30:52,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 16:30:52,674 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-12-22 16:30:52,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:30:52,675 INFO L225 Difference]: With dead ends: 150 [2021-12-22 16:30:52,675 INFO L226 Difference]: Without dead ends: 150 [2021-12-22 16:30:52,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 34 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=224, Invalid=1416, Unknown=8, NotChecked=158, Total=1806 [2021-12-22 16:30:52,677 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 16 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:30:52,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 341 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 84 Unchecked, 0.1s Time] [2021-12-22 16:30:52,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-12-22 16:30:52,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2021-12-22 16:30:52,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 95 states have (on average 1.5052631578947369) internal successors, (143), 136 states have internal predecessors, (143), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:30:52,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 159 transitions. [2021-12-22 16:30:52,682 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 159 transitions. Word has length 26 [2021-12-22 16:30:52,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:30:52,682 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 159 transitions. [2021-12-22 16:30:52,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:30:52,683 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 159 transitions. [2021-12-22 16:30:52,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-22 16:30:52,684 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:30:52,684 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:30:52,697 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:52,899 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-12-22 16:30:53,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:30:53,097 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting list_addErr3REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:30:53,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:30:53,098 INFO L85 PathProgramCache]: Analyzing trace with hash -868531820, now seen corresponding path program 1 times [2021-12-22 16:30:53,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:30:53,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [851443794] [2021-12-22 16:30:53,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:53,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:30:53,099 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:30:53,100 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:30:53,102 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-12-22 16:30:53,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:53,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 47 conjunts are in the unsatisfiable core [2021-12-22 16:30:53,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:30:53,312 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:53,316 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:30:53,527 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:30:53,536 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:30:53,756 INFO L353 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-22 16:30:53,756 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 26 [2021-12-22 16:30:53,796 INFO L353 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-12-22 16:30:53,796 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 27 [2021-12-22 16:30:53,880 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-12-22 16:30:53,900 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:30:54,012 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:30:54,019 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-22 16:30:54,104 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:30:54,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:30:54,633 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_479 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_479) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0)))) (forall ((v_ArrVal_478 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_479 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_479) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_478) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))))) is different from false [2021-12-22 16:30:59,438 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:30:59,438 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 85 [2021-12-22 16:30:59,441 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:30:59,443 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 74 [2021-12-22 16:30:59,452 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:30:59,452 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 54 [2021-12-22 16:30:59,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:30:59,456 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 29 [2021-12-22 16:30:59,558 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:30:59,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [851443794] [2021-12-22 16:30:59,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [851443794] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:30:59,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1198691285] [2021-12-22 16:30:59,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:30:59,559 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:30:59,559 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:30:59,560 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:30:59,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-12-22 16:30:59,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:30:59,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 51 conjunts are in the unsatisfiable core [2021-12-22 16:30:59,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:00,027 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:00,031 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:00,589 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:00,596 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:00,859 INFO L353 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-22 16:31:00,860 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 26 [2021-12-22 16:31:00,881 INFO L353 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-12-22 16:31:00,881 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 27 [2021-12-22 16:31:00,978 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:31:00,982 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-12-22 16:31:01,210 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:01,213 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-22 16:31:01,228 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:01,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:01,294 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_551 (Array (_ BitVec 32) (_ BitVec 32)))) (let ((.cse0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_551) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))) (bvule (bvadd (_ bv4 32) .cse0) (bvadd (_ bv8 32) .cse0)))) (forall ((v_ArrVal_552 (Array (_ BitVec 32) (_ BitVec 32))) (v_ArrVal_551 (Array (_ BitVec 32) (_ BitVec 32)))) (bvule (bvadd (_ bv8 32) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_551) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_gl_insert_~node~0#1.base| v_ArrVal_552) |c_~#gl_list~0.base|) |c_~#gl_list~0.offset|))))) is different from false [2021-12-22 16:31:02,294 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:31:02,294 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 84 treesize of output 85 [2021-12-22 16:31:02,296 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:31:02,297 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 74 [2021-12-22 16:31:02,302 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:31:02,303 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 54 [2021-12-22 16:31:02,304 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-22 16:31:02,306 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 29 [2021-12-22 16:31:02,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1198691285] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:31:02,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:31:02,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-12-22 16:31:02,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222829877] [2021-12-22 16:31:02,435 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:31:02,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-22 16:31:02,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:02,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-22 16:31:02,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1113, Unknown=14, NotChecked=138, Total=1406 [2021-12-22 16:31:02,454 INFO L87 Difference]: Start difference. First operand 150 states and 159 transitions. Second operand has 27 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:31:03,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:03,499 INFO L93 Difference]: Finished difference Result 210 states and 224 transitions. [2021-12-22 16:31:03,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 16:31:03,499 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-12-22 16:31:03,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:03,500 INFO L225 Difference]: With dead ends: 210 [2021-12-22 16:31:03,500 INFO L226 Difference]: Without dead ends: 210 [2021-12-22 16:31:03,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=217, Invalid=1417, Unknown=14, NotChecked=158, Total=1806 [2021-12-22 16:31:03,501 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 186 mSDsluCounter, 971 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 1570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 802 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:03,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 1060 Invalid, 1570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 759 Invalid, 0 Unknown, 802 Unchecked, 0.8s Time] [2021-12-22 16:31:03,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-12-22 16:31:03,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 143. [2021-12-22 16:31:03,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 88 states have (on average 1.5340909090909092) internal successors, (135), 129 states have internal predecessors, (135), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:31:03,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 151 transitions. [2021-12-22 16:31:03,505 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 151 transitions. Word has length 26 [2021-12-22 16:31:03,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:03,505 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 151 transitions. [2021-12-22 16:31:03,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:31:03,505 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 151 transitions. [2021-12-22 16:31:03,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-22 16:31:03,505 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:03,505 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, 1] [2021-12-22 16:31:03,514 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-12-22 16:31:03,717 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-12-22 16:31:03,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:03,914 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr30REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:03,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:03,915 INFO L85 PathProgramCache]: Analyzing trace with hash -414351977, now seen corresponding path program 1 times [2021-12-22 16:31:03,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:03,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1001501240] [2021-12-22 16:31:03,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:03,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:03,915 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:03,916 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:03,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-12-22 16:31:04,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:04,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 16:31:04,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:04,165 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:04,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:04,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:31:04,353 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:04,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1001501240] [2021-12-22 16:31:04,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1001501240] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:31:04,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:31:04,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-22 16:31:04,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787672875] [2021-12-22 16:31:04,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:31:04,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 16:31:04,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:04,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 16:31:04,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:31:04,354 INFO L87 Difference]: Start difference. First operand 143 states and 151 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:31:04,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:04,912 INFO L93 Difference]: Finished difference Result 188 states and 201 transitions. [2021-12-22 16:31:04,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 16:31:04,913 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-12-22 16:31:04,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:04,916 INFO L225 Difference]: With dead ends: 188 [2021-12-22 16:31:04,916 INFO L226 Difference]: Without dead ends: 188 [2021-12-22 16:31:04,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-12-22 16:31:04,917 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 219 mSDsluCounter, 595 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:04,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 690 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-22 16:31:04,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-12-22 16:31:04,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 141. [2021-12-22 16:31:04,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 86 states have (on average 1.5348837209302326) internal successors, (132), 127 states have internal predecessors, (132), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:31:04,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 148 transitions. [2021-12-22 16:31:04,921 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 148 transitions. Word has length 31 [2021-12-22 16:31:04,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:04,921 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 148 transitions. [2021-12-22 16:31:04,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-22 16:31:04,922 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 148 transitions. [2021-12-22 16:31:04,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-22 16:31:04,924 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:04,924 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:04,932 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:05,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:31:05,132 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:05,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:05,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1582571725, now seen corresponding path program 1 times [2021-12-22 16:31:05,132 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:05,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1911835317] [2021-12-22 16:31:05,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:05,132 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:05,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:05,134 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:05,138 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-12-22 16:31:05,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:05,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 29 conjunts are in the unsatisfiable core [2021-12-22 16:31:05,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:05,379 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:05,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:31:05,583 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:31:05,583 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:05,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1911835317] [2021-12-22 16:31:05,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1911835317] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:31:05,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:31:05,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-22 16:31:05,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728236052] [2021-12-22 16:31:05,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:31:05,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 16:31:05,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:05,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 16:31:05,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:31:05,584 INFO L87 Difference]: Start difference. First operand 141 states and 148 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:31:06,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:06,084 INFO L93 Difference]: Finished difference Result 188 states and 200 transitions. [2021-12-22 16:31:06,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-22 16:31:06,084 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2021-12-22 16:31:06,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:06,085 INFO L225 Difference]: With dead ends: 188 [2021-12-22 16:31:06,085 INFO L226 Difference]: Without dead ends: 188 [2021-12-22 16:31:06,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-12-22 16:31:06,086 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 205 mSDsluCounter, 550 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:06,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 644 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-22 16:31:06,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-12-22 16:31:06,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 142. [2021-12-22 16:31:06,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 87 states have (on average 1.528735632183908) internal successors, (133), 127 states have internal predecessors, (133), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:31:06,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 149 transitions. [2021-12-22 16:31:06,089 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 149 transitions. Word has length 37 [2021-12-22 16:31:06,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:06,089 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 149 transitions. [2021-12-22 16:31:06,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:31:06,089 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 149 transitions. [2021-12-22 16:31:06,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 16:31:06,089 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:06,090 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:06,099 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:06,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:31:06,297 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:06,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:06,298 INFO L85 PathProgramCache]: Analyzing trace with hash 456962673, now seen corresponding path program 1 times [2021-12-22 16:31:06,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:06,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [153233953] [2021-12-22 16:31:06,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:06,298 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:06,298 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:06,300 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:06,316 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-12-22 16:31:06,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:06,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 16:31:06,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:06,471 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:06,563 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:06,634 INFO L353 Elim1Store]: treesize reduction 27, result has 43.8 percent of original size [2021-12-22 16:31:06,634 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 35 [2021-12-22 16:31:06,674 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 12 [2021-12-22 16:31:06,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-22 16:31:06,773 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:31:06,773 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:06,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [153233953] [2021-12-22 16:31:06,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [153233953] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:31:06,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:31:06,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-22 16:31:06,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035295703] [2021-12-22 16:31:06,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:31:06,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-22 16:31:06,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:06,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-22 16:31:06,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-12-22 16:31:06,775 INFO L87 Difference]: Start difference. First operand 142 states and 149 transitions. Second operand has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:31:06,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:06,872 INFO L93 Difference]: Finished difference Result 152 states and 159 transitions. [2021-12-22 16:31:06,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-22 16:31:06,873 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2021-12-22 16:31:06,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:06,874 INFO L225 Difference]: With dead ends: 152 [2021-12-22 16:31:06,874 INFO L226 Difference]: Without dead ends: 152 [2021-12-22 16:31:06,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-12-22 16:31:06,874 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 32 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:06,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 291 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 87 Unchecked, 0.1s Time] [2021-12-22 16:31:06,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-12-22 16:31:06,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2021-12-22 16:31:06,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 93 states have (on average 1.5053763440860215) internal successors, (140), 134 states have internal predecessors, (140), 9 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:31:06,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 158 transitions. [2021-12-22 16:31:06,877 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 158 transitions. Word has length 39 [2021-12-22 16:31:06,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:06,878 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 158 transitions. [2021-12-22 16:31:06,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-22 16:31:06,879 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 158 transitions. [2021-12-22 16:31:06,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-22 16:31:06,881 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:06,881 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:06,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:07,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:31:07,089 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting val_from_nodeErr1REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:07,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:07,089 INFO L85 PathProgramCache]: Analyzing trace with hash 456962674, now seen corresponding path program 1 times [2021-12-22 16:31:07,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:07,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1408950548] [2021-12-22 16:31:07,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:07,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:07,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:07,104 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:07,157 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-12-22 16:31:07,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:07,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-22 16:31:07,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:07,312 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:07,316 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:07,491 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:07,499 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:07,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:07,653 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 16:31:07,667 INFO L353 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-22 16:31:07,667 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-22 16:31:07,736 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:07,738 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-22 16:31:07,800 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:07,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:08,161 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:08,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1408950548] [2021-12-22 16:31:08,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1408950548] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:31:08,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [827304345] [2021-12-22 16:31:08,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:08,162 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:08,162 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:31:08,163 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:31:08,164 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-12-22 16:31:08,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:08,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 45 conjunts are in the unsatisfiable core [2021-12-22 16:31:08,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:08,457 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2021-12-22 16:31:08,503 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:09,069 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:09,080 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:09,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:09,450 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 16:31:09,950 INFO L353 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-12-22 16:31:09,951 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 31 treesize of output 24 [2021-12-22 16:31:09,973 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:10,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:10,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:10,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [827304345] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:31:10,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:31:10,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 24 [2021-12-22 16:31:10,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134075749] [2021-12-22 16:31:10,464 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:31:10,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-22 16:31:10,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:10,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-22 16:31:10,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=893, Unknown=0, NotChecked=0, Total=992 [2021-12-22 16:31:10,465 INFO L87 Difference]: Start difference. First operand 150 states and 158 transitions. Second operand has 25 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 16:31:11,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:11,240 INFO L93 Difference]: Finished difference Result 160 states and 168 transitions. [2021-12-22 16:31:11,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-22 16:31:11,240 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) Word has length 39 [2021-12-22 16:31:11,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:11,241 INFO L225 Difference]: With dead ends: 160 [2021-12-22 16:31:11,241 INFO L226 Difference]: Without dead ends: 160 [2021-12-22 16:31:11,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=170, Invalid=1390, Unknown=0, NotChecked=0, Total=1560 [2021-12-22 16:31:11,242 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 54 mSDsluCounter, 1048 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 1166 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 404 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:11,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 1166 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 312 Invalid, 0 Unknown, 404 Unchecked, 0.4s Time] [2021-12-22 16:31:11,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-22 16:31:11,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 155. [2021-12-22 16:31:11,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 97 states have (on average 1.4742268041237114) internal successors, (143), 138 states have internal predecessors, (143), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:31:11,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 161 transitions. [2021-12-22 16:31:11,244 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 161 transitions. Word has length 39 [2021-12-22 16:31:11,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:11,244 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 161 transitions. [2021-12-22 16:31:11,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-22 16:31:11,245 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 161 transitions. [2021-12-22 16:31:11,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-22 16:31:11,245 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:11,245 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:11,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:11,455 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:11,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:11,652 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:11,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:11,653 INFO L85 PathProgramCache]: Analyzing trace with hash 138353380, now seen corresponding path program 1 times [2021-12-22 16:31:11,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:11,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1591737938] [2021-12-22 16:31:11,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:11,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:11,653 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:11,655 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:11,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-12-22 16:31:11,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:11,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-22 16:31:11,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:11,886 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-22 16:31:11,887 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 16:31:11,887 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:11,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1591737938] [2021-12-22 16:31:11,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1591737938] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 16:31:11,887 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 16:31:11,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-22 16:31:11,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924116001] [2021-12-22 16:31:11,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 16:31:11,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 16:31:11,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:11,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 16:31:11,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-22 16:31:11,888 INFO L87 Difference]: Start difference. First operand 155 states and 161 transitions. Second operand has 5 states, 4 states have (on average 8.0) internal successors, (32), 5 states have internal predecessors, (32), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-22 16:31:12,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:12,122 INFO L93 Difference]: Finished difference Result 199 states and 211 transitions. [2021-12-22 16:31:12,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-22 16:31:12,124 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 8.0) internal successors, (32), 5 states have internal predecessors, (32), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2021-12-22 16:31:12,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:12,124 INFO L225 Difference]: With dead ends: 199 [2021-12-22 16:31:12,124 INFO L226 Difference]: Without dead ends: 199 [2021-12-22 16:31:12,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-22 16:31:12,125 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 50 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:12,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 333 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 16:31:12,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-12-22 16:31:12,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 154. [2021-12-22 16:31:12,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 97 states have (on average 1.4639175257731958) internal successors, (142), 137 states have internal predecessors, (142), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:31:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 160 transitions. [2021-12-22 16:31:12,128 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 160 transitions. Word has length 44 [2021-12-22 16:31:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:12,128 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 160 transitions. [2021-12-22 16:31:12,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 8.0) internal successors, (32), 5 states have internal predecessors, (32), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-22 16:31:12,128 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 160 transitions. [2021-12-22 16:31:12,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-22 16:31:12,128 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:12,128 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:12,138 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:12,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2021-12-22 16:31:12,335 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:12,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:12,336 INFO L85 PathProgramCache]: Analyzing trace with hash 138353381, now seen corresponding path program 1 times [2021-12-22 16:31:12,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:12,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1802163470] [2021-12-22 16:31:12,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:12,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:12,336 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:12,344 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:12,345 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-12-22 16:31:12,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:12,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-22 16:31:12,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:12,539 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:12,544 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:12,708 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:12,712 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:12,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:12,873 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 16:31:12,880 INFO L353 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-12-22 16:31:12,881 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-12-22 16:31:12,936 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:12,938 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-12-22 16:31:13,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:13,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:15,340 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:15,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1802163470] [2021-12-22 16:31:15,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1802163470] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:31:15,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2092636866] [2021-12-22 16:31:15,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:15,340 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:15,340 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:31:15,341 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:31:15,342 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-12-22 16:31:15,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:15,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-22 16:31:15,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:15,725 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2021-12-22 16:31:15,790 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-22 16:31:16,174 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:16,182 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:16,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:16,502 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 16:31:16,938 INFO L353 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-12-22 16:31:16,938 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 31 treesize of output 24 [2021-12-22 16:31:16,954 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:18,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 16:31:18,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:20,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2092636866] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 16:31:20,587 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-22 16:31:20,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 22 [2021-12-22 16:31:20,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300974879] [2021-12-22 16:31:20,587 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-22 16:31:20,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-22 16:31:20,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-12-22 16:31:20,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-22 16:31:20,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=647, Unknown=2, NotChecked=0, Total=756 [2021-12-22 16:31:20,588 INFO L87 Difference]: Start difference. First operand 154 states and 160 transitions. Second operand has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:31:22,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 16:31:22,497 INFO L93 Difference]: Finished difference Result 159 states and 165 transitions. [2021-12-22 16:31:22,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-22 16:31:22,497 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) Word has length 44 [2021-12-22 16:31:22,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 16:31:22,498 INFO L225 Difference]: With dead ends: 159 [2021-12-22 16:31:22,498 INFO L226 Difference]: Without dead ends: 159 [2021-12-22 16:31:22,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=195, Invalid=1063, Unknown=2, NotChecked=0, Total=1260 [2021-12-22 16:31:22,499 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 45 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 803 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 251 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-22 16:31:22,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 803 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 241 Invalid, 0 Unknown, 251 Unchecked, 0.3s Time] [2021-12-22 16:31:22,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-12-22 16:31:22,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 156. [2021-12-22 16:31:22,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 99 states have (on average 1.4545454545454546) internal successors, (144), 138 states have internal predecessors, (144), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-22 16:31:22,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 162 transitions. [2021-12-22 16:31:22,514 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 162 transitions. Word has length 44 [2021-12-22 16:31:22,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 16:31:22,514 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 162 transitions. [2021-12-22 16:31:22,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 21 states have internal predecessors, (72), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (8), 6 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-22 16:31:22,514 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 162 transitions. [2021-12-22 16:31:22,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-22 16:31:22,515 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 16:31:22,515 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-22 16:31:22,524 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:22,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-12-22 16:31:22,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:22,927 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting val_from_nodeErr0REQUIRES_VIOLATION === [val_from_nodeErr0REQUIRES_VIOLATION, val_from_nodeErr1REQUIRES_VIOLATION, list_emptyErr0REQUIRES_VIOLATION, list_emptyErr1REQUIRES_VIOLATION (and 52 more)] === [2021-12-22 16:31:22,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 16:31:22,928 INFO L85 PathProgramCache]: Analyzing trace with hash 770302443, now seen corresponding path program 1 times [2021-12-22 16:31:22,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-12-22 16:31:22,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1442342376] [2021-12-22 16:31:22,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:22,928 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-12-22 16:31:22,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2021-12-22 16:31:22,929 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-12-22 16:31:22,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-12-22 16:31:23,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:23,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 51 conjunts are in the unsatisfiable core [2021-12-22 16:31:23,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:23,157 INFO L353 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-22 16:31:23,157 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-12-22 16:31:23,179 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2021-12-22 16:31:23,187 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2021-12-22 16:31:23,313 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 16:31:23,372 INFO L353 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-12-22 16:31:23,372 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 16:31:23,404 INFO L353 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-12-22 16:31:23,404 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 30 [2021-12-22 16:31:23,408 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:23,485 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 35 [2021-12-22 16:31:23,804 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2021-12-22 16:31:24,042 INFO L353 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-12-22 16:31:24,042 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2021-12-22 16:31:24,166 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:31:24,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:24,421 INFO L353 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-12-22 16:31:24,422 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2021-12-22 16:31:24,540 INFO L353 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-12-22 16:31:24,540 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2021-12-22 16:31:25,521 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 72 [2021-12-22 16:31:36,905 INFO L353 Elim1Store]: treesize reduction 132, result has 62.2 percent of original size [2021-12-22 16:31:36,906 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 10 new quantified variables, introduced 36 case distinctions, treesize of input 55734 treesize of output 53074 [2021-12-22 16:31:38,854 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-12-22 16:31:38,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1442342376] [2021-12-22 16:31:38,854 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-12-22 16:31:38,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [918109859] [2021-12-22 16:31:38,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 16:31:38,855 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-12-22 16:31:38,855 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2021-12-22 16:31:38,871 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-12-22 16:31:38,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-12-22 16:31:39,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 16:31:39,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-22 16:31:39,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 16:31:39,415 INFO L353 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2021-12-22 16:31:39,415 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2021-12-22 16:31:39,515 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2021-12-22 16:31:39,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:39,538 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 7 [2021-12-22 16:31:39,957 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-22 16:31:40,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:40,052 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-12-22 16:31:40,090 INFO L353 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2021-12-22 16:31:40,090 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 30 [2021-12-22 16:31:40,109 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-12-22 16:31:40,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-22 16:31:40,258 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 18 [2021-12-22 16:31:40,776 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-12-22 16:31:41,146 INFO L353 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-22 16:31:41,146 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 18 [2021-12-22 16:31:41,165 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-22 16:31:41,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 16:31:41,220 INFO L353 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-12-22 16:31:41,220 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2021-12-22 16:31:41,263 INFO L353 Elim1Store]: treesize reduction 5, result has 75.0 percent of original size [2021-12-22 16:31:41,263 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2021-12-22 16:31:42,541 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 72