./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext2/length_test03-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext2/length_test03-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN --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 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 10:55:01,201 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 10:55:01,203 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 10:55:01,243 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 10:55:01,246 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 10:55:01,248 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 10:55:01,249 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 10:55:01,252 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 10:55:01,256 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 10:55:01,257 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 10:55:01,258 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 10:55:01,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 10:55:01,262 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 10:55:01,265 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 10:55:01,267 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 10:55:01,268 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 10:55:01,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 10:55:01,276 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 10:55:01,278 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 10:55:01,282 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 10:55:01,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 10:55:01,290 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 10:55:01,291 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 10:55:01,293 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 10:55:01,297 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 10:55:01,302 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 10:55:01,303 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 10:55:01,304 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 10:55:01,306 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 10:55:01,308 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 10:55:01,308 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 10:55:01,311 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 10:55:01,312 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 10:55:01,313 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 10:55:01,315 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 10:55:01,316 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 10:55:01,317 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 10:55:01,317 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 10:55:01,317 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 10:55:01,318 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 10:55:01,320 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 10:55:01,321 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2022-11-20 10:55:01,363 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 10:55:01,364 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 10:55:01,364 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 10:55:01,365 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 10:55:01,366 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 10:55:01,366 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 10:55:01,367 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-20 10:55:01,367 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-20 10:55:01,367 INFO L138 SettingsManager]: * Use SBE=true [2022-11-20 10:55:01,368 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 10:55:01,369 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 10:55:01,369 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-20 10:55:01,369 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 10:55:01,370 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 10:55:01,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 10:55:01,370 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-20 10:55:01,370 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-20 10:55:01,371 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-20 10:55:01,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 10:55:01,371 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-20 10:55:01,371 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 10:55:01,371 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 10:55:01,372 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 10:55:01,372 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-20 10:55:01,372 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 10:55:01,372 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 10:55:01,373 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 10:55:01,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 10:55:01,374 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-11-20 10:55:01,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 10:55:01,374 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6e9221de91e231efa38b63f264828813e89f68c8ac306a629b3513c0e7bf1ed0 [2022-11-20 10:55:01,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 10:55:01,714 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 10:55:01,719 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 10:55:01,721 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 10:55:01,722 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 10:55:01,723 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/../../sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2022-11-20 10:55:04,821 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 10:55:05,128 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 10:55:05,128 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/sv-benchmarks/c/memsafety-ext2/length_test03-1.i [2022-11-20 10:55:05,146 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/data/42d3f20cb/c37e8c57d37a487a8d0d3575ffbfb375/FLAG16aed8799 [2022-11-20 10:55:05,162 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/data/42d3f20cb/c37e8c57d37a487a8d0d3575ffbfb375 [2022-11-20 10:55:05,165 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 10:55:05,167 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 10:55:05,169 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 10:55:05,169 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 10:55:05,173 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 10:55:05,174 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,176 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@651ee7fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05, skipping insertion in model container [2022-11-20 10:55:05,176 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,185 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 10:55:05,237 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 10:55:05,606 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 10:55:05,621 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 10:55:05,700 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 10:55:05,735 INFO L208 MainTranslator]: Completed translation [2022-11-20 10:55:05,736 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05 WrapperNode [2022-11-20 10:55:05,736 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 10:55:05,739 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 10:55:05,739 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 10:55:05,739 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 10:55:05,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,781 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,808 INFO L138 Inliner]: procedures = 123, calls = 38, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 98 [2022-11-20 10:55:05,809 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 10:55:05,810 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 10:55:05,810 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 10:55:05,810 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 10:55:05,822 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,822 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,825 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,826 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,835 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,840 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,842 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,846 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 10:55:05,847 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 10:55:05,847 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 10:55:05,847 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 10:55:05,848 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (1/1) ... [2022-11-20 10:55:05,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 10:55:05,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:05,888 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 10:55:05,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 10:55:05,934 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-20 10:55:05,934 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-20 10:55:05,939 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 10:55:05,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-20 10:55:05,940 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-20 10:55:05,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-20 10:55:05,940 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 10:55:05,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 10:55:05,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 10:55:05,940 INFO L130 BoogieDeclarations]: Found specification of procedure append [2022-11-20 10:55:05,941 INFO L138 BoogieDeclarations]: Found implementation of procedure append [2022-11-20 10:55:06,040 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 10:55:06,043 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 10:55:06,647 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 10:55:06,655 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 10:55:06,656 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-20 10:55:06,658 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:55:06 BoogieIcfgContainer [2022-11-20 10:55:06,658 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 10:55:06,665 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 10:55:06,665 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 10:55:06,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 10:55:06,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:55:05" (1/3) ... [2022-11-20 10:55:06,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d0d7bcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:55:06, skipping insertion in model container [2022-11-20 10:55:06,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:55:05" (2/3) ... [2022-11-20 10:55:06,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d0d7bcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:55:06, skipping insertion in model container [2022-11-20 10:55:06,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:55:06" (3/3) ... [2022-11-20 10:55:06,676 INFO L112 eAbstractionObserver]: Analyzing ICFG length_test03-1.i [2022-11-20 10:55:06,696 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 10:55:06,697 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 59 error locations. [2022-11-20 10:55:06,767 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 10:55:06,774 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7a7ea8c8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 10:55:06,775 INFO L358 AbstractCegarLoop]: Starting to check reachability of 59 error locations. [2022-11-20 10:55:06,779 INFO L276 IsEmpty]: Start isEmpty. Operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:06,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 10:55:06,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:06,786 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 10:55:06,787 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:06,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:06,793 INFO L85 PathProgramCache]: Analyzing trace with hash 29857, now seen corresponding path program 1 times [2022-11-20 10:55:06,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:06,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535028587] [2022-11-20 10:55:06,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:06,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:07,000 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:07,001 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:07,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535028587] [2022-11-20 10:55:07,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535028587] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:07,003 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:07,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:07,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530086902] [2022-11-20 10:55:07,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:07,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:07,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:07,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:07,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,047 INFO L87 Difference]: Start difference. First operand has 128 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 124 states have internal predecessors, (134), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-20 10:55:07,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:07,225 INFO L93 Difference]: Finished difference Result 165 states and 174 transitions. [2022-11-20 10:55:07,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:07,228 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-11-20 10:55:07,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:07,239 INFO L225 Difference]: With dead ends: 165 [2022-11-20 10:55:07,239 INFO L226 Difference]: Without dead ends: 163 [2022-11-20 10:55:07,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,245 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 53 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:07,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 170 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:07,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-11-20 10:55:07,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 124. [2022-11-20 10:55:07,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 64 states have (on average 1.96875) internal successors, (126), 120 states have internal predecessors, (126), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:07,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 130 transitions. [2022-11-20 10:55:07,295 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 130 transitions. Word has length 3 [2022-11-20 10:55:07,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:07,295 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 130 transitions. [2022-11-20 10:55:07,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-20 10:55:07,296 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 130 transitions. [2022-11-20 10:55:07,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-20 10:55:07,297 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:07,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-20 10:55:07,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-20 10:55:07,298 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:07,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:07,299 INFO L85 PathProgramCache]: Analyzing trace with hash 29858, now seen corresponding path program 1 times [2022-11-20 10:55:07,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:07,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640253048] [2022-11-20 10:55:07,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:07,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:07,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:07,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:07,431 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:07,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640253048] [2022-11-20 10:55:07,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640253048] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:07,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:07,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:07,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013071834] [2022-11-20 10:55:07,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:07,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:07,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:07,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:07,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,437 INFO L87 Difference]: Start difference. First operand 124 states and 130 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-20 10:55:07,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:07,598 INFO L93 Difference]: Finished difference Result 124 states and 131 transitions. [2022-11-20 10:55:07,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:07,600 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-11-20 10:55:07,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:07,606 INFO L225 Difference]: With dead ends: 124 [2022-11-20 10:55:07,607 INFO L226 Difference]: Without dead ends: 124 [2022-11-20 10:55:07,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,613 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 10 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:07,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 191 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:07,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-20 10:55:07,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2022-11-20 10:55:07,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 64 states have (on average 1.9375) internal successors, (124), 118 states have internal predecessors, (124), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:07,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 128 transitions. [2022-11-20 10:55:07,624 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 128 transitions. Word has length 3 [2022-11-20 10:55:07,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:07,625 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 128 transitions. [2022-11-20 10:55:07,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2022-11-20 10:55:07,625 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 128 transitions. [2022-11-20 10:55:07,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 10:55:07,625 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:07,626 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 10:55:07,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-20 10:55:07,626 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:07,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:07,627 INFO L85 PathProgramCache]: Analyzing trace with hash 889446152, now seen corresponding path program 1 times [2022-11-20 10:55:07,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:07,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005717471] [2022-11-20 10:55:07,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:07,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:07,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:07,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:07,703 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:07,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005717471] [2022-11-20 10:55:07,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005717471] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:07,704 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:07,704 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:07,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852589772] [2022-11-20 10:55:07,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:07,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:07,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:07,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:07,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,706 INFO L87 Difference]: Start difference. First operand 122 states and 128 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 10:55:07,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:07,822 INFO L93 Difference]: Finished difference Result 139 states and 147 transitions. [2022-11-20 10:55:07,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:07,823 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 10:55:07,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:07,824 INFO L225 Difference]: With dead ends: 139 [2022-11-20 10:55:07,825 INFO L226 Difference]: Without dead ends: 139 [2022-11-20 10:55:07,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,832 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 27 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:07,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 174 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:07,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-20 10:55:07,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 125. [2022-11-20 10:55:07,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 69 states have (on average 1.8840579710144927) internal successors, (130), 121 states have internal predecessors, (130), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:07,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2022-11-20 10:55:07,846 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 6 [2022-11-20 10:55:07,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:07,847 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2022-11-20 10:55:07,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 10:55:07,847 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2022-11-20 10:55:07,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 10:55:07,848 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:07,848 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 10:55:07,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-20 10:55:07,848 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:07,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:07,849 INFO L85 PathProgramCache]: Analyzing trace with hash 889446153, now seen corresponding path program 1 times [2022-11-20 10:55:07,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:07,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101016356] [2022-11-20 10:55:07,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:07,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:07,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:07,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:07,986 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:07,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101016356] [2022-11-20 10:55:07,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101016356] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:07,987 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:07,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:07,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070585192] [2022-11-20 10:55:07,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:07,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:07,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:07,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:07,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:07,989 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 10:55:08,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:08,115 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2022-11-20 10:55:08,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:08,116 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 10:55:08,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:08,117 INFO L225 Difference]: With dead ends: 125 [2022-11-20 10:55:08,117 INFO L226 Difference]: Without dead ends: 125 [2022-11-20 10:55:08,117 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:08,123 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 4 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:08,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 191 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:08,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-20 10:55:08,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2022-11-20 10:55:08,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 69 states have (on average 1.855072463768116) internal successors, (128), 119 states have internal predecessors, (128), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:08,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 132 transitions. [2022-11-20 10:55:08,143 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 132 transitions. Word has length 6 [2022-11-20 10:55:08,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:08,143 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 132 transitions. [2022-11-20 10:55:08,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 10:55:08,144 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 132 transitions. [2022-11-20 10:55:08,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 10:55:08,144 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:08,144 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:08,145 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-20 10:55:08,145 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:08,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:08,145 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550317, now seen corresponding path program 1 times [2022-11-20 10:55:08,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:08,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425684589] [2022-11-20 10:55:08,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:08,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:08,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:08,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:08,349 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:08,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425684589] [2022-11-20 10:55:08,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425684589] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:08,350 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:08,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:08,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608491945] [2022-11-20 10:55:08,350 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:08,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:08,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:08,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:08,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:08,355 INFO L87 Difference]: Start difference. First operand 123 states and 132 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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) [2022-11-20 10:55:08,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:08,451 INFO L93 Difference]: Finished difference Result 118 states and 127 transitions. [2022-11-20 10:55:08,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:08,451 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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 12 [2022-11-20 10:55:08,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:08,453 INFO L225 Difference]: With dead ends: 118 [2022-11-20 10:55:08,453 INFO L226 Difference]: Without dead ends: 118 [2022-11-20 10:55:08,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:08,454 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 43 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:08,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 147 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:08,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-11-20 10:55:08,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2022-11-20 10:55:08,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 69 states have (on average 1.7826086956521738) internal successors, (123), 114 states have internal predecessors, (123), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:08,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 127 transitions. [2022-11-20 10:55:08,480 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 127 transitions. Word has length 12 [2022-11-20 10:55:08,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:08,481 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 127 transitions. [2022-11-20 10:55:08,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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) [2022-11-20 10:55:08,483 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 127 transitions. [2022-11-20 10:55:08,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-20 10:55:08,484 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:08,484 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:08,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-20 10:55:08,485 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:08,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:08,490 INFO L85 PathProgramCache]: Analyzing trace with hash 1036550316, now seen corresponding path program 1 times [2022-11-20 10:55:08,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:08,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584416357] [2022-11-20 10:55:08,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:08,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:08,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:08,585 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:08,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584416357] [2022-11-20 10:55:08,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584416357] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:08,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:08,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 10:55:08,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326137233] [2022-11-20 10:55:08,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:08,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:08,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:08,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:08,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:08,589 INFO L87 Difference]: Start difference. First operand 118 states and 127 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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) [2022-11-20 10:55:08,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:08,674 INFO L93 Difference]: Finished difference Result 113 states and 122 transitions. [2022-11-20 10:55:08,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:08,674 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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 12 [2022-11-20 10:55:08,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:08,675 INFO L225 Difference]: With dead ends: 113 [2022-11-20 10:55:08,676 INFO L226 Difference]: Without dead ends: 113 [2022-11-20 10:55:08,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-20 10:55:08,677 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 38 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:08,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 138 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:08,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-20 10:55:08,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-11-20 10:55:08,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 69 states have (on average 1.710144927536232) internal successors, (118), 109 states have internal predecessors, (118), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 10:55:08,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2022-11-20 10:55:08,690 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 12 [2022-11-20 10:55:08,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:08,691 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2022-11-20 10:55:08,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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) [2022-11-20 10:55:08,691 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2022-11-20 10:55:08,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 10:55:08,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:08,692 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:08,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-20 10:55:08,692 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:08,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:08,693 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288823, now seen corresponding path program 1 times [2022-11-20 10:55:08,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:08,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711746962] [2022-11-20 10:55:08,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:08,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:08,958 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:08,958 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:08,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711746962] [2022-11-20 10:55:08,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711746962] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:08,959 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:08,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 10:55:08,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655008352] [2022-11-20 10:55:08,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:08,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 10:55:08,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:08,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 10:55:08,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-20 10:55:08,961 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-11-20 10:55:09,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:09,235 INFO L93 Difference]: Finished difference Result 223 states and 240 transitions. [2022-11-20 10:55:09,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 10:55:09,236 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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 [2022-11-20 10:55:09,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:09,237 INFO L225 Difference]: With dead ends: 223 [2022-11-20 10:55:09,237 INFO L226 Difference]: Without dead ends: 223 [2022-11-20 10:55:09,238 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:55:09,238 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 296 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:09,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 209 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 10:55:09,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-20 10:55:09,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 147. [2022-11-20 10:55:09,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 108 states have (on average 1.6296296296296295) internal successors, (176), 142 states have internal predecessors, (176), 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) [2022-11-20 10:55:09,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 180 transitions. [2022-11-20 10:55:09,245 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 180 transitions. Word has length 13 [2022-11-20 10:55:09,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:09,245 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 180 transitions. [2022-11-20 10:55:09,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-11-20 10:55:09,246 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 180 transitions. [2022-11-20 10:55:09,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-20 10:55:09,246 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:09,246 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:09,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-20 10:55:09,247 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:09,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:09,248 INFO L85 PathProgramCache]: Analyzing trace with hash 2068288824, now seen corresponding path program 1 times [2022-11-20 10:55:09,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:09,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032193391] [2022-11-20 10:55:09,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:09,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:09,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:09,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:09,558 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:09,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032193391] [2022-11-20 10:55:09,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032193391] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:09,559 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:09,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-20 10:55:09,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317740438] [2022-11-20 10:55:09,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:09,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-20 10:55:09,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:09,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-20 10:55:09,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-20 10:55:09,560 INFO L87 Difference]: Start difference. First operand 147 states and 180 transitions. Second operand has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-11-20 10:55:09,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:09,761 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2022-11-20 10:55:09,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 10:55:09,761 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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 [2022-11-20 10:55:09,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:09,762 INFO L225 Difference]: With dead ends: 173 [2022-11-20 10:55:09,763 INFO L226 Difference]: Without dead ends: 173 [2022-11-20 10:55:09,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:55:09,763 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 33 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:09,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 277 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 10:55:09,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-20 10:55:09,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2022-11-20 10:55:09,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 130 states have (on average 1.5538461538461539) internal successors, (202), 165 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:09,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 208 transitions. [2022-11-20 10:55:09,769 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 208 transitions. Word has length 13 [2022-11-20 10:55:09,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:09,769 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 208 transitions. [2022-11-20 10:55:09,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.0) internal successors, (12), 6 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) [2022-11-20 10:55:09,769 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 208 transitions. [2022-11-20 10:55:09,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-20 10:55:09,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:09,770 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:09,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-20 10:55:09,771 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:09,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:09,772 INFO L85 PathProgramCache]: Analyzing trace with hash -203399961, now seen corresponding path program 1 times [2022-11-20 10:55:09,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:09,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070724953] [2022-11-20 10:55:09,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:09,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:09,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:10,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:10,471 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:10,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070724953] [2022-11-20 10:55:10,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070724953] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:10,472 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:10,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-20 10:55:10,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022053077] [2022-11-20 10:55:10,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:10,473 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-20 10:55:10,473 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:10,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-20 10:55:10,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-20 10:55:10,475 INFO L87 Difference]: Start difference. First operand 171 states and 208 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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) [2022-11-20 10:55:10,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:10,765 INFO L93 Difference]: Finished difference Result 173 states and 207 transitions. [2022-11-20 10:55:10,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 10:55:10,766 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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 22 [2022-11-20 10:55:10,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:10,767 INFO L225 Difference]: With dead ends: 173 [2022-11-20 10:55:10,767 INFO L226 Difference]: Without dead ends: 173 [2022-11-20 10:55:10,767 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-20 10:55:10,768 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 34 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:10,768 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 514 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 10:55:10,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-20 10:55:10,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2022-11-20 10:55:10,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 130 states have (on average 1.5461538461538462) internal successors, (201), 165 states have internal predecessors, (201), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:10,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 207 transitions. [2022-11-20 10:55:10,772 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 207 transitions. Word has length 22 [2022-11-20 10:55:10,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:10,773 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 207 transitions. [2022-11-20 10:55:10,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 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) [2022-11-20 10:55:10,773 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 207 transitions. [2022-11-20 10:55:10,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-20 10:55:10,773 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:10,774 INFO L195 NwaCegarLoop]: 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] [2022-11-20 10:55:10,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-20 10:55:10,774 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:10,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:10,778 INFO L85 PathProgramCache]: Analyzing trace with hash 167434122, now seen corresponding path program 1 times [2022-11-20 10:55:10,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:10,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477433375] [2022-11-20 10:55:10,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:10,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:10,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:11,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:11,572 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:11,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477433375] [2022-11-20 10:55:11,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477433375] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:11,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:11,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-11-20 10:55:11,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457609577] [2022-11-20 10:55:11,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:11,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-20 10:55:11,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:11,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-20 10:55:11,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-20 10:55:11,573 INFO L87 Difference]: Start difference. First operand 171 states and 207 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 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) [2022-11-20 10:55:11,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:11,888 INFO L93 Difference]: Finished difference Result 163 states and 196 transitions. [2022-11-20 10:55:11,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 10:55:11,889 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 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 24 [2022-11-20 10:55:11,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:11,890 INFO L225 Difference]: With dead ends: 163 [2022-11-20 10:55:11,890 INFO L226 Difference]: Without dead ends: 163 [2022-11-20 10:55:11,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-20 10:55:11,891 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 14 mSDsluCounter, 486 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:11,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 582 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 10:55:11,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-11-20 10:55:11,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2022-11-20 10:55:11,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 122 states have (on average 1.5573770491803278) internal successors, (190), 157 states have internal predecessors, (190), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:11,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 196 transitions. [2022-11-20 10:55:11,897 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 196 transitions. Word has length 24 [2022-11-20 10:55:11,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:11,897 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 196 transitions. [2022-11-20 10:55:11,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 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) [2022-11-20 10:55:11,897 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 196 transitions. [2022-11-20 10:55:11,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-20 10:55:11,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:11,898 INFO L195 NwaCegarLoop]: 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] [2022-11-20 10:55:11,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-20 10:55:11,899 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:11,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:11,900 INFO L85 PathProgramCache]: Analyzing trace with hash -1239284085, now seen corresponding path program 1 times [2022-11-20 10:55:11,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:11,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922651743] [2022-11-20 10:55:11,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:11,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:11,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:11,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:12,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:12,016 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:12,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922651743] [2022-11-20 10:55:12,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922651743] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:12,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 10:55:12,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 10:55:12,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827381690] [2022-11-20 10:55:12,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:12,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 10:55:12,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:12,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 10:55:12,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 10:55:12,019 INFO L87 Difference]: Start difference. First operand 163 states and 196 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:12,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:12,129 INFO L93 Difference]: Finished difference Result 155 states and 172 transitions. [2022-11-20 10:55:12,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 10:55:12,129 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-11-20 10:55:12,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:12,130 INFO L225 Difference]: With dead ends: 155 [2022-11-20 10:55:12,131 INFO L226 Difference]: Without dead ends: 155 [2022-11-20 10:55:12,131 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 10:55:12,132 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 12 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:12,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 247 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:12,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-20 10:55:12,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 142. [2022-11-20 10:55:12,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 101 states have (on average 1.504950495049505) internal successors, (152), 136 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:12,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 158 transitions. [2022-11-20 10:55:12,154 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 158 transitions. Word has length 29 [2022-11-20 10:55:12,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:12,154 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 158 transitions. [2022-11-20 10:55:12,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:12,155 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 158 transitions. [2022-11-20 10:55:12,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-20 10:55:12,155 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:12,155 INFO L195 NwaCegarLoop]: 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] [2022-11-20 10:55:12,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-20 10:55:12,156 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:12,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:12,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1195581248, now seen corresponding path program 1 times [2022-11-20 10:55:12,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:12,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507690828] [2022-11-20 10:55:12,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:12,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:12,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:12,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:12,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:12,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:12,623 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:12,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507690828] [2022-11-20 10:55:12,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507690828] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:12,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120127412] [2022-11-20 10:55:12,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:12,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:12,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:12,627 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:12,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 10:55:12,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:12,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-20 10:55:12,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:13,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:13,104 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:13,117 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:55:13,117 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:13,129 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:13,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:21,586 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 41 [2022-11-20 10:55:21,611 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:21,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 62 [2022-11-20 10:55:21,844 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:21,844 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 30 [2022-11-20 10:55:22,007 INFO L321 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2022-11-20 10:55:22,008 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 37 [2022-11-20 10:55:22,057 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:22,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120127412] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:55:22,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:55:22,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 19 [2022-11-20 10:55:22,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749077200] [2022-11-20 10:55:22,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:22,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 10:55:22,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:22,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 10:55:22,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2022-11-20 10:55:22,060 INFO L87 Difference]: Start difference. First operand 142 states and 158 transitions. Second operand has 20 states, 19 states have (on average 3.473684210526316) internal successors, (66), 16 states have internal predecessors, (66), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-20 10:55:22,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:22,554 INFO L93 Difference]: Finished difference Result 179 states and 189 transitions. [2022-11-20 10:55:22,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 10:55:22,554 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.473684210526316) internal successors, (66), 16 states have internal predecessors, (66), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2022-11-20 10:55:22,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:22,556 INFO L225 Difference]: With dead ends: 179 [2022-11-20 10:55:22,556 INFO L226 Difference]: Without dead ends: 179 [2022-11-20 10:55:22,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2022-11-20 10:55:22,557 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 350 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 214 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:22,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [351 Valid, 514 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 382 Invalid, 0 Unknown, 214 Unchecked, 0.4s Time] [2022-11-20 10:55:22,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-11-20 10:55:22,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 140. [2022-11-20 10:55:22,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 101 states have (on average 1.4158415841584158) internal successors, (143), 134 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:22,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 149 transitions. [2022-11-20 10:55:22,565 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 149 transitions. Word has length 31 [2022-11-20 10:55:22,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:22,566 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 149 transitions. [2022-11-20 10:55:22,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.473684210526316) internal successors, (66), 16 states have internal predecessors, (66), 5 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-20 10:55:22,566 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 149 transitions. [2022-11-20 10:55:22,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-20 10:55:22,567 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:22,567 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-20 10:55:22,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:22,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-20 10:55:22,779 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:22,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:22,779 INFO L85 PathProgramCache]: Analyzing trace with hash 32633587, now seen corresponding path program 1 times [2022-11-20 10:55:22,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:22,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966276208] [2022-11-20 10:55:22,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:22,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:22,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:23,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:23,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:23,208 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:23,209 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966276208] [2022-11-20 10:55:23,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966276208] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:23,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824120334] [2022-11-20 10:55:23,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:23,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:23,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:23,219 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:23,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 10:55:23,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:23,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-20 10:55:23,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:23,385 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:23,425 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_695 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_695))))) is different from true [2022-11-20 10:55:23,528 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:23,529 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:23,554 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-20 10:55:23,555 INFO L350 Elim1Store]: Elim1 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 14 [2022-11-20 10:55:23,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-20 10:55:23,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:23,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1824120334] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:23,643 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:23,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2022-11-20 10:55:23,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075272841] [2022-11-20 10:55:23,644 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:23,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-20 10:55:23,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:23,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-20 10:55:23,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=86, Unknown=1, NotChecked=18, Total=132 [2022-11-20 10:55:23,645 INFO L87 Difference]: Start difference. First operand 140 states and 149 transitions. Second operand has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-20 10:55:24,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:24,067 INFO L93 Difference]: Finished difference Result 164 states and 172 transitions. [2022-11-20 10:55:24,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-20 10:55:24,068 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2022-11-20 10:55:24,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:24,069 INFO L225 Difference]: With dead ends: 164 [2022-11-20 10:55:24,069 INFO L226 Difference]: Without dead ends: 164 [2022-11-20 10:55:24,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=138, Unknown=1, NotChecked=24, Total=210 [2022-11-20 10:55:24,070 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 156 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:24,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 365 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 371 Invalid, 0 Unknown, 104 Unchecked, 0.3s Time] [2022-11-20 10:55:24,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-11-20 10:55:24,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 141. [2022-11-20 10:55:24,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 103 states have (on average 1.4174757281553398) internal successors, (146), 135 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:55:24,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2022-11-20 10:55:24,074 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 32 [2022-11-20 10:55:24,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:24,075 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2022-11-20 10:55:24,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.6) internal successors, (46), 8 states have internal predecessors, (46), 1 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-20 10:55:24,075 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2022-11-20 10:55:24,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-20 10:55:24,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:24,076 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-11-20 10:55:24,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:24,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:24,282 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:24,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:24,282 INFO L85 PathProgramCache]: Analyzing trace with hash 32633588, now seen corresponding path program 1 times [2022-11-20 10:55:24,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:24,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288453850] [2022-11-20 10:55:24,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:24,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:24,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:24,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:24,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:24,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:24,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:24,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288453850] [2022-11-20 10:55:24,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288453850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:24,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488284431] [2022-11-20 10:55:24,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:24,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:24,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:24,835 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:24,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 10:55:25,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:25,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-20 10:55:25,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:25,014 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:25,112 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_870 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_870))) (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_869 Int)) (= (store |c_old(#length)| append_~node~0.base v_ArrVal_869) |c_#length|)))) is different from true [2022-11-20 10:55:25,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:25,227 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 16 [2022-11-20 10:55:25,243 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:25,243 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:25,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:25,317 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 16 [2022-11-20 10:55:25,324 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:55:25,324 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:25,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-20 10:55:25,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:25,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488284431] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:25,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:25,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 15 [2022-11-20 10:55:25,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613846650] [2022-11-20 10:55:25,696 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:25,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 10:55:25,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:25,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 10:55:25,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=260, Unknown=1, NotChecked=32, Total=342 [2022-11-20 10:55:25,697 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 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) [2022-11-20 10:55:26,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:26,530 INFO L93 Difference]: Finished difference Result 297 states and 327 transitions. [2022-11-20 10:55:26,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 10:55:26,530 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 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 32 [2022-11-20 10:55:26,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:26,534 INFO L225 Difference]: With dead ends: 297 [2022-11-20 10:55:26,535 INFO L226 Difference]: Without dead ends: 297 [2022-11-20 10:55:26,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=107, Invalid=544, Unknown=3, NotChecked=48, Total=702 [2022-11-20 10:55:26,536 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 299 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 788 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 199 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:26,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 466 Invalid, 788 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 557 Invalid, 0 Unknown, 199 Unchecked, 0.5s Time] [2022-11-20 10:55:26,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2022-11-20 10:55:26,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 191. [2022-11-20 10:55:26,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 149 states have (on average 1.4496644295302012) internal successors, (216), 181 states have internal predecessors, (216), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (8), 5 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-20 10:55:26,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 230 transitions. [2022-11-20 10:55:26,545 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 230 transitions. Word has length 32 [2022-11-20 10:55:26,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:26,545 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 230 transitions. [2022-11-20 10:55:26,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.7333333333333334) internal successors, (56), 12 states have internal predecessors, (56), 3 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) [2022-11-20 10:55:26,545 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 230 transitions. [2022-11-20 10:55:26,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-20 10:55:26,546 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:26,546 INFO L195 NwaCegarLoop]: 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] [2022-11-20 10:55:26,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:26,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-20 10:55:26,752 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting appendErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:26,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:26,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1524682805, now seen corresponding path program 1 times [2022-11-20 10:55:26,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:26,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437789618] [2022-11-20 10:55:26,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:26,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:26,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:27,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:27,329 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:27,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437789618] [2022-11-20 10:55:27,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437789618] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:27,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651900971] [2022-11-20 10:55:27,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:27,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:27,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:27,331 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:27,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 10:55:27,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:27,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-20 10:55:27,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:27,526 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:27,534 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:27,627 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_1049 Int)) (= (store |c_old(#length)| append_~node~0.base v_ArrVal_1049) |c_#length|)) (exists ((v_ArrVal_1048 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_1048))) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2022-11-20 10:55:27,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:27,742 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:27,758 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:27,759 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:27,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:27,829 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:27,837 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:55:27,837 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:27,885 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2022-11-20 10:55:27,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:28,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651900971] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:28,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:28,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2022-11-20 10:55:28,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622723739] [2022-11-20 10:55:28,163 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:28,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 10:55:28,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:28,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 10:55:28,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=292, Unknown=1, NotChecked=34, Total=380 [2022-11-20 10:55:28,164 INFO L87 Difference]: Start difference. First operand 191 states and 230 transitions. Second operand has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 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) [2022-11-20 10:55:29,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:29,168 INFO L93 Difference]: Finished difference Result 314 states and 347 transitions. [2022-11-20 10:55:29,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 10:55:29,169 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 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 35 [2022-11-20 10:55:29,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:29,171 INFO L225 Difference]: With dead ends: 314 [2022-11-20 10:55:29,171 INFO L226 Difference]: Without dead ends: 314 [2022-11-20 10:55:29,171 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=153, Invalid=777, Unknown=4, NotChecked=58, Total=992 [2022-11-20 10:55:29,172 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 254 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 252 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:29,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 575 Invalid, 961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 680 Invalid, 0 Unknown, 252 Unchecked, 0.6s Time] [2022-11-20 10:55:29,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2022-11-20 10:55:29,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 205. [2022-11-20 10:55:29,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 162 states have (on average 1.4382716049382716) internal successors, (233), 195 states have internal predecessors, (233), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-20 10:55:29,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 249 transitions. [2022-11-20 10:55:29,181 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 249 transitions. Word has length 35 [2022-11-20 10:55:29,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:29,181 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 249 transitions. [2022-11-20 10:55:29,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.933333333333333) internal successors, (59), 12 states have internal predecessors, (59), 3 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) [2022-11-20 10:55:29,182 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 249 transitions. [2022-11-20 10:55:29,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-20 10:55:29,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:29,183 INFO L195 NwaCegarLoop]: trace histogram [2, 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] [2022-11-20 10:55:29,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:29,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:29,394 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting appendErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:29,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:29,394 INFO L85 PathProgramCache]: Analyzing trace with hash 636517819, now seen corresponding path program 1 times [2022-11-20 10:55:29,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:29,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234932774] [2022-11-20 10:55:29,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:29,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:29,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:29,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:29,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:29,469 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-20 10:55:29,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:29,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234932774] [2022-11-20 10:55:29,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234932774] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:29,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543275590] [2022-11-20 10:55:29,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:29,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:29,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:29,471 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:29,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 10:55:29,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:29,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-20 10:55:29,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:29,665 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-20 10:55:29,666 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 10:55:29,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543275590] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:29,666 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 10:55:29,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2022-11-20 10:55:29,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854038038] [2022-11-20 10:55:29,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:29,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:29,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:29,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:29,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 10:55:29,668 INFO L87 Difference]: Start difference. First operand 205 states and 249 transitions. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:29,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:29,680 INFO L93 Difference]: Finished difference Result 202 states and 244 transitions. [2022-11-20 10:55:29,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:29,681 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 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 37 [2022-11-20 10:55:29,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:29,686 INFO L225 Difference]: With dead ends: 202 [2022-11-20 10:55:29,686 INFO L226 Difference]: Without dead ends: 202 [2022-11-20 10:55:29,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 10:55:29,687 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 0 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:29,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 203 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 10:55:29,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2022-11-20 10:55:29,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2022-11-20 10:55:29,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 159 states have (on average 1.4339622641509433) internal successors, (228), 192 states have internal predecessors, (228), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-20 10:55:29,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 244 transitions. [2022-11-20 10:55:29,695 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 244 transitions. Word has length 37 [2022-11-20 10:55:29,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:29,696 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 244 transitions. [2022-11-20 10:55:29,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:29,696 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 244 transitions. [2022-11-20 10:55:29,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-20 10:55:29,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:29,699 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:29,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:29,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-20 10:55:29,907 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:29,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:29,907 INFO L85 PathProgramCache]: Analyzing trace with hash -1748599685, now seen corresponding path program 1 times [2022-11-20 10:55:29,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:29,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603342716] [2022-11-20 10:55:29,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:29,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:29,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:30,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:30,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:30,049 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:30,049 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:30,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603342716] [2022-11-20 10:55:30,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603342716] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:30,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012533808] [2022-11-20 10:55:30,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:30,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:30,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:30,051 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:30,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 10:55:30,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:30,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 10:55:30,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:30,280 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 10:55:30,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 10:55:30,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012533808] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 10:55:30,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 10:55:30,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-11-20 10:55:30,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003665570] [2022-11-20 10:55:30,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 10:55:30,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-20 10:55:30,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:30,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-20 10:55:30,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:55:30,283 INFO L87 Difference]: Start difference. First operand 202 states and 244 transitions. Second operand has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:30,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:30,354 INFO L93 Difference]: Finished difference Result 201 states and 243 transitions. [2022-11-20 10:55:30,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-20 10:55:30,355 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 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 38 [2022-11-20 10:55:30,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:30,357 INFO L225 Difference]: With dead ends: 201 [2022-11-20 10:55:30,357 INFO L226 Difference]: Without dead ends: 201 [2022-11-20 10:55:30,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:55:30,358 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 15 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:30,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 150 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:55:30,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-11-20 10:55:30,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 200. [2022-11-20 10:55:30,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 160 states have (on average 1.4125) internal successors, (226), 190 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-20 10:55:30,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 242 transitions. [2022-11-20 10:55:30,367 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 242 transitions. Word has length 38 [2022-11-20 10:55:30,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:30,367 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 242 transitions. [2022-11-20 10:55:30,367 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 15.0) internal successors, (30), 3 states have internal predecessors, (30), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 10:55:30,368 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 242 transitions. [2022-11-20 10:55:30,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-20 10:55:30,369 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:30,370 INFO L195 NwaCegarLoop]: trace histogram [2, 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] [2022-11-20 10:55:30,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:30,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-20 10:55:30,575 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:30,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:30,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1429441119, now seen corresponding path program 1 times [2022-11-20 10:55:30,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:30,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020153331] [2022-11-20 10:55:30,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:30,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:30,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:31,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:31,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:31,753 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:31,753 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:31,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020153331] [2022-11-20 10:55:31,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020153331] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:31,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139747770] [2022-11-20 10:55:31,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:31,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:31,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:31,759 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:31,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 10:55:31,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:31,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-20 10:55:31,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:31,982 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:32,035 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:32,035 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:32,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:55:32,357 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:32,358 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:55:32,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:55:32,471 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:32,472 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 37 [2022-11-20 10:55:32,509 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:55:32,639 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:32,648 INFO L321 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-11-20 10:55:32,649 INFO L350 Elim1Store]: Elim1 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 29 treesize of output 28 [2022-11-20 10:55:32,861 INFO L321 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2022-11-20 10:55:32,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2022-11-20 10:55:32,938 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:33,113 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:33,161 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:33,234 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:33,235 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2022-11-20 10:55:33,282 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:33,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:33,319 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1608 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1608) c_append_~head.base) (+ c_append_~head.offset 4))) 1)) is different from false [2022-11-20 10:55:33,598 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:33,598 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 34 [2022-11-20 10:55:33,612 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:33,613 INFO L350 Elim1Store]: Elim1 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 332 treesize of output 214 [2022-11-20 10:55:33,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-20 10:55:33,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 174 treesize of output 158 [2022-11-20 10:55:33,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139747770] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:33,996 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:33,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 27 [2022-11-20 10:55:33,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397717356] [2022-11-20 10:55:33,997 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:33,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-20 10:55:33,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:33,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-20 10:55:33,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=892, Unknown=2, NotChecked=60, Total=1056 [2022-11-20 10:55:33,998 INFO L87 Difference]: Start difference. First operand 200 states and 242 transitions. Second operand has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 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) [2022-11-20 10:55:34,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:34,830 INFO L93 Difference]: Finished difference Result 213 states and 257 transitions. [2022-11-20 10:55:34,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 10:55:34,830 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 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 40 [2022-11-20 10:55:34,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:34,832 INFO L225 Difference]: With dead ends: 213 [2022-11-20 10:55:34,832 INFO L226 Difference]: Without dead ends: 213 [2022-11-20 10:55:34,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=169, Invalid=1315, Unknown=2, NotChecked=74, Total=1560 [2022-11-20 10:55:34,834 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 83 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 917 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:34,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 917 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 405 Invalid, 0 Unknown, 118 Unchecked, 0.3s Time] [2022-11-20 10:55:34,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-11-20 10:55:34,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 212. [2022-11-20 10:55:34,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 172 states have (on average 1.3953488372093024) internal successors, (240), 201 states have internal predecessors, (240), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-20 10:55:34,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 256 transitions. [2022-11-20 10:55:34,843 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 256 transitions. Word has length 40 [2022-11-20 10:55:34,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:34,843 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 256 transitions. [2022-11-20 10:55:34,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 24 states have internal predecessors, (73), 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) [2022-11-20 10:55:34,843 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 256 transitions. [2022-11-20 10:55:34,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-20 10:55:34,845 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:34,845 INFO L195 NwaCegarLoop]: trace histogram [2, 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] [2022-11-20 10:55:34,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:35,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-20 10:55:35,056 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:35,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:35,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1429441120, now seen corresponding path program 1 times [2022-11-20 10:55:35,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:35,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624749528] [2022-11-20 10:55:35,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:35,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:35,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:36,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:36,897 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:36,898 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:36,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624749528] [2022-11-20 10:55:36,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624749528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:36,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [461452119] [2022-11-20 10:55:36,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:36,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:36,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:36,903 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:36,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 10:55:37,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:37,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-20 10:55:37,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:37,158 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:37,213 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:37,213 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:37,270 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:37,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:55:37,540 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:55:37,631 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:37,631 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:55:37,650 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:37,651 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:55:37,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:55:37,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:55:37,810 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:37,810 INFO L350 Elim1Store]: Elim1 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 40 treesize of output 46 [2022-11-20 10:55:37,831 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:37,831 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 44 [2022-11-20 10:55:37,869 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:55:37,915 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:55:38,104 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:38,115 INFO L321 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-11-20 10:55:38,115 INFO L350 Elim1Store]: Elim1 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 29 treesize of output 28 [2022-11-20 10:55:38,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:38,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2022-11-20 10:55:38,401 INFO L321 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2022-11-20 10:55:38,401 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 24 [2022-11-20 10:55:38,494 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:38,502 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-11-20 10:55:38,649 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:38,655 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-11-20 10:55:38,711 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:55:38,718 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 18 [2022-11-20 10:55:38,794 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:38,795 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2022-11-20 10:55:38,801 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:38,802 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-20 10:55:38,809 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:38,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:38,904 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_append_~head.offset 4))) (and (forall ((v_ArrVal_1828 (Array Int Int)) (v_ArrVal_1827 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1827) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_1828) c_append_~head.base) .cse0)))) (forall ((v_ArrVal_1827 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_1827) c_append_~head.base) .cse0)))))) is different from false [2022-11-20 10:55:39,549 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:39,553 INFO L350 Elim1Store]: Elim1 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 105 treesize of output 106 [2022-11-20 10:55:39,571 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:39,571 INFO L350 Elim1Store]: Elim1 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 341 treesize of output 253 [2022-11-20 10:55:39,587 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:39,587 INFO L350 Elim1Store]: Elim1 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 229 treesize of output 190 [2022-11-20 10:55:39,611 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:39,611 INFO L350 Elim1Store]: Elim1 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 1142 treesize of output 1084 [2022-11-20 10:55:39,674 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:39,674 INFO L350 Elim1Store]: Elim1 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 3183 treesize of output 3064 [2022-11-20 10:55:39,744 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 3052 treesize of output 2660 [2022-11-20 10:55:39,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2639 treesize of output 2383 [2022-11-20 10:55:39,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2408 treesize of output 2208 [2022-11-20 10:55:39,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2191 treesize of output 2055 [2022-11-20 10:55:39,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2055 treesize of output 2039 [2022-11-20 10:55:49,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [461452119] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:49,144 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:49,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-20 10:55:49,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549456154] [2022-11-20 10:55:49,145 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:49,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-20 10:55:49,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:49,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-20 10:55:49,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=948, Unknown=2, NotChecked=62, Total=1122 [2022-11-20 10:55:49,147 INFO L87 Difference]: Start difference. First operand 212 states and 256 transitions. Second operand has 28 states, 27 states have (on average 2.6666666666666665) internal successors, (72), 24 states have internal predecessors, (72), 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) [2022-11-20 10:55:50,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:50,166 INFO L93 Difference]: Finished difference Result 231 states and 277 transitions. [2022-11-20 10:55:50,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 10:55:50,167 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.6666666666666665) internal successors, (72), 24 states have internal predecessors, (72), 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 40 [2022-11-20 10:55:50,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:50,168 INFO L225 Difference]: With dead ends: 231 [2022-11-20 10:55:50,168 INFO L226 Difference]: Without dead ends: 231 [2022-11-20 10:55:50,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=184, Invalid=1458, Unknown=2, NotChecked=78, Total=1722 [2022-11-20 10:55:50,169 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 72 mSDsluCounter, 1009 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 1093 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 199 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:50,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 1093 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 426 Invalid, 0 Unknown, 199 Unchecked, 0.4s Time] [2022-11-20 10:55:50,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-11-20 10:55:50,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 226. [2022-11-20 10:55:50,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 185 states have (on average 1.372972972972973) internal successors, (254), 214 states have internal predecessors, (254), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-20 10:55:50,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 272 transitions. [2022-11-20 10:55:50,177 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 272 transitions. Word has length 40 [2022-11-20 10:55:50,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:50,177 INFO L495 AbstractCegarLoop]: Abstraction has 226 states and 272 transitions. [2022-11-20 10:55:50,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.6666666666666665) internal successors, (72), 24 states have internal predecessors, (72), 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) [2022-11-20 10:55:50,178 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 272 transitions. [2022-11-20 10:55:50,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-20 10:55:50,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:50,178 INFO L195 NwaCegarLoop]: 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] [2022-11-20 10:55:50,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:50,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:50,385 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:50,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:50,385 INFO L85 PathProgramCache]: Analyzing trace with hash 1618850475, now seen corresponding path program 1 times [2022-11-20 10:55:50,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:50,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734422655] [2022-11-20 10:55:50,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:50,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:50,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:51,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:51,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:53,132 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:53,132 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:53,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734422655] [2022-11-20 10:55:53,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734422655] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:53,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457969235] [2022-11-20 10:55:53,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:53,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:53,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:53,135 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:53,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 10:55:53,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:53,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 75 conjunts are in the unsatisfiable core [2022-11-20 10:55:53,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:53,383 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:53,406 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:53,406 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:53,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:55:53,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:55:53,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:53,533 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:55:53,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:53,549 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:55:54,064 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_2049 (Array Int Int)) (v_ArrVal_2058 (Array Int Int)) (v_ArrVal_2053 (Array Int Int))) (= (store (store (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_2049) |c_append_#in~head.base| v_ArrVal_2053) append_~node~0.base v_ArrVal_2058) |c_#memory_$Pointer$.base|)) (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1)) (exists ((v_ArrVal_2050 (Array Int Int)) (v_ArrVal_2057 (Array Int Int)) (v_ArrVal_2054 (Array Int Int))) (= |c_#memory_$Pointer$.offset| (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_2050) |c_append_#in~head.base| v_ArrVal_2054) append_~node~0.base v_ArrVal_2057))))) is different from true [2022-11-20 10:55:54,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:54,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:54,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-20 10:55:54,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:54,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:55:54,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2022-11-20 10:55:54,157 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-20 10:55:54,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2022-11-20 10:55:54,565 INFO L321 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2022-11-20 10:55:54,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2022-11-20 10:55:54,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-20 10:55:54,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-20 10:55:54,741 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 10 [2022-11-20 10:55:54,745 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:54,745 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 22 treesize of output 10 [2022-11-20 10:55:54,754 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:54,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:54,779 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_2059 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_2059) c_append_~head.base) c_append_~head.offset) 0)) (forall ((v_ArrVal_2060 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_2060) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2022-11-20 10:55:55,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457969235] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:55,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:55:55,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19] total 31 [2022-11-20 10:55:55,808 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402074119] [2022-11-20 10:55:55,809 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:55:55,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-20 10:55:55,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:55:55,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-20 10:55:55,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=922, Unknown=13, NotChecked=126, Total=1190 [2022-11-20 10:55:55,811 INFO L87 Difference]: Start difference. First operand 226 states and 272 transitions. Second operand has 31 states, 31 states have (on average 2.096774193548387) internal successors, (65), 27 states have internal predecessors, (65), 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) [2022-11-20 10:55:57,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:55:57,463 INFO L93 Difference]: Finished difference Result 282 states and 344 transitions. [2022-11-20 10:55:57,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 10:55:57,464 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.096774193548387) internal successors, (65), 27 states have internal predecessors, (65), 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 41 [2022-11-20 10:55:57,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:55:57,466 INFO L225 Difference]: With dead ends: 282 [2022-11-20 10:55:57,466 INFO L226 Difference]: Without dead ends: 282 [2022-11-20 10:55:57,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=137, Invalid=1044, Unknown=17, NotChecked=134, Total=1332 [2022-11-20 10:55:57,468 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 50 mSDsluCounter, 773 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 859 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 10:55:57,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 859 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 409 Invalid, 0 Unknown, 261 Unchecked, 0.8s Time] [2022-11-20 10:55:57,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-11-20 10:55:57,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 236. [2022-11-20 10:55:57,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 194 states have (on average 1.3608247422680413) internal successors, (264), 222 states have internal predecessors, (264), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (13), 6 states have call predecessors, (13), 7 states have call successors, (13) [2022-11-20 10:55:57,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 284 transitions. [2022-11-20 10:55:57,477 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 284 transitions. Word has length 41 [2022-11-20 10:55:57,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:55:57,477 INFO L495 AbstractCegarLoop]: Abstraction has 236 states and 284 transitions. [2022-11-20 10:55:57,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.096774193548387) internal successors, (65), 27 states have internal predecessors, (65), 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) [2022-11-20 10:55:57,477 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 284 transitions. [2022-11-20 10:55:57,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-20 10:55:57,478 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:55:57,478 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:55:57,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 10:55:57,684 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:57,685 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:55:57,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:55:57,685 INFO L85 PathProgramCache]: Analyzing trace with hash 1664648962, now seen corresponding path program 1 times [2022-11-20 10:55:57,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:55:57,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622488358] [2022-11-20 10:55:57,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:57,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:55:57,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:58,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:55:58,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:58,594 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:58,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:55:58,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622488358] [2022-11-20 10:55:58,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622488358] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:55:58,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309720469] [2022-11-20 10:55:58,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:55:58,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:55:58,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:55:58,599 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:55:58,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 10:55:58,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:55:58,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-20 10:55:58,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:55:58,880 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:58,921 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:55:58,922 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:55:59,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:55:59,151 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:55:59,207 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:59,207 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 23 treesize of output 27 [2022-11-20 10:55:59,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 13 treesize of output 7 [2022-11-20 10:55:59,280 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:55:59,280 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 28 treesize of output 32 [2022-11-20 10:55:59,384 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2022-11-20 10:55:59,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 15 treesize of output 15 [2022-11-20 10:55:59,520 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:55:59,521 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:55:59,569 INFO L350 Elim1Store]: Elim1 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 34 treesize of output 30 [2022-11-20 10:55:59,613 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:59,613 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 35 treesize of output 15 [2022-11-20 10:55:59,619 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:55:59,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:55:59,632 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2284 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_2284) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2022-11-20 10:55:59,864 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:59,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2022-11-20 10:55:59,869 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:55:59,873 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:55:59,874 INFO L350 Elim1Store]: Elim1 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 64 treesize of output 34 [2022-11-20 10:55:59,881 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-20 10:55:59,882 INFO L350 Elim1Store]: Elim1 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 13 treesize of output 12 [2022-11-20 10:55:59,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2022-11-20 10:56:00,164 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:00,164 INFO L350 Elim1Store]: Elim1 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 2 case distinctions, treesize of input 27 treesize of output 33 [2022-11-20 10:56:00,186 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:00,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 141 treesize of output 147 [2022-11-20 10:56:00,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 114 treesize of output 106 [2022-11-20 10:56:00,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 102 [2022-11-20 10:56:00,638 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:00,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 61 treesize of output 169 [2022-11-20 10:56:01,167 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2022-11-20 10:56:01,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309720469] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:56:01,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:56:01,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 15] total 38 [2022-11-20 10:56:01,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106447618] [2022-11-20 10:56:01,167 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:01,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-20 10:56:01,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:01,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-20 10:56:01,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1161, Unknown=6, NotChecked=70, Total=1406 [2022-11-20 10:56:01,169 INFO L87 Difference]: Start difference. First operand 236 states and 284 transitions. Second operand has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:56:02,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:02,609 INFO L93 Difference]: Finished difference Result 223 states and 266 transitions. [2022-11-20 10:56:02,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 10:56:02,609 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2022-11-20 10:56:02,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:02,611 INFO L225 Difference]: With dead ends: 223 [2022-11-20 10:56:02,611 INFO L226 Difference]: Without dead ends: 223 [2022-11-20 10:56:02,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 50 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=426, Invalid=2122, Unknown=6, NotChecked=98, Total=2652 [2022-11-20 10:56:02,612 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 276 mSDsluCounter, 907 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 986 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 263 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:02,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 986 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 462 Invalid, 0 Unknown, 263 Unchecked, 0.5s Time] [2022-11-20 10:56:02,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-20 10:56:02,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 219. [2022-11-20 10:56:02,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 178 states have (on average 1.3651685393258426) internal successors, (243), 207 states have internal predecessors, (243), 6 states have call successors, (6), 6 states have call predecessors, (6), 6 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-20 10:56:02,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 259 transitions. [2022-11-20 10:56:02,620 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 259 transitions. Word has length 42 [2022-11-20 10:56:02,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:02,620 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 259 transitions. [2022-11-20 10:56:02,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.4210526315789473) internal successors, (92), 32 states have internal predecessors, (92), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 10:56:02,621 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 259 transitions. [2022-11-20 10:56:02,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-20 10:56:02,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:02,621 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:02,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:02,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:02,828 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:02,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:02,828 INFO L85 PathProgramCache]: Analyzing trace with hash -996553650, now seen corresponding path program 1 times [2022-11-20 10:56:02,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:02,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248759876] [2022-11-20 10:56:02,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:02,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:02,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:04,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:04,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:06,569 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:56:06,569 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:06,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248759876] [2022-11-20 10:56:06,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248759876] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:06,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836111272] [2022-11-20 10:56:06,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:06,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:06,574 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:06,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 10:56:06,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:06,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-20 10:56:06,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:06,830 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:06,880 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:56:06,880 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:56:06,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:06,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:07,447 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_2501 (Array Int Int)) (v_ArrVal_2497 (Array Int Int)) (v_ArrVal_2492 (Array Int Int))) (= (store (store (store |c_old(#memory_$Pointer$.base)| append_~node~0.base v_ArrVal_2492) |c_append_#in~head.base| v_ArrVal_2497) append_~node~0.base v_ArrVal_2501) |c_#memory_$Pointer$.base|)) (= (select |c_old(#valid)| append_~node~0.base) 0) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base 1)) (exists ((v_ArrVal_2500 (Array Int Int)) (v_ArrVal_2496 (Array Int Int)) (v_ArrVal_2493 (Array Int Int))) (= (store (store (store |c_old(#memory_$Pointer$.offset)| append_~node~0.base v_ArrVal_2493) |c_append_#in~head.base| v_ArrVal_2496) append_~node~0.base v_ArrVal_2500) |c_#memory_$Pointer$.offset|)))) is different from true [2022-11-20 10:56:07,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:07,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:07,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2022-11-20 10:56:07,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:07,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:07,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 23 [2022-11-20 10:56:07,532 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-20 10:56:07,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2022-11-20 10:56:07,848 INFO L321 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2022-11-20 10:56:07,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2022-11-20 10:56:07,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 10:56:07,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 10:56:08,041 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:08,044 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:08,120 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 10:56:08,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:13,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836111272] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:13,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:56:13,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 34 [2022-11-20 10:56:13,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281885007] [2022-11-20 10:56:13,521 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:13,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-20 10:56:13,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:13,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-20 10:56:13,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1326, Unknown=12, NotChecked=74, Total=1560 [2022-11-20 10:56:13,524 INFO L87 Difference]: Start difference. First operand 219 states and 259 transitions. Second operand has 34 states, 34 states have (on average 2.088235294117647) internal successors, (71), 30 states have internal predecessors, (71), 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) [2022-11-20 10:56:15,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:15,753 INFO L93 Difference]: Finished difference Result 260 states and 309 transitions. [2022-11-20 10:56:15,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 10:56:15,754 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.088235294117647) internal successors, (71), 30 states have internal predecessors, (71), 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 43 [2022-11-20 10:56:15,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:15,755 INFO L225 Difference]: With dead ends: 260 [2022-11-20 10:56:15,755 INFO L226 Difference]: Without dead ends: 260 [2022-11-20 10:56:15,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=181, Invalid=1699, Unknown=16, NotChecked=84, Total=1980 [2022-11-20 10:56:15,756 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 69 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 1170 SdHoareTripleChecker+Invalid, 1008 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 457 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:15,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 1170 Invalid, 1008 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 538 Invalid, 0 Unknown, 457 Unchecked, 0.8s Time] [2022-11-20 10:56:15,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2022-11-20 10:56:15,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 217. [2022-11-20 10:56:15,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 177 states have (on average 1.3615819209039548) internal successors, (241), 205 states have internal predecessors, (241), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2022-11-20 10:56:15,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 254 transitions. [2022-11-20 10:56:15,763 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 254 transitions. Word has length 43 [2022-11-20 10:56:15,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:15,763 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 254 transitions. [2022-11-20 10:56:15,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.088235294117647) internal successors, (71), 30 states have internal predecessors, (71), 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) [2022-11-20 10:56:15,764 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 254 transitions. [2022-11-20 10:56:15,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-20 10:56:15,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:15,764 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:15,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:15,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:15,971 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:15,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:15,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1373746222, now seen corresponding path program 1 times [2022-11-20 10:56:15,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:15,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270891275] [2022-11-20 10:56:15,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:15,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:16,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:16,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:16,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:16,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-11-20 10:56:16,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:16,099 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:56:16,099 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:16,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270891275] [2022-11-20 10:56:16,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270891275] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:16,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1047161235] [2022-11-20 10:56:16,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:16,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:16,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:16,102 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:16,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 10:56:16,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:16,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 10:56:16,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:16,417 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:56:16,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:16,444 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:56:16,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1047161235] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:56:16,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:56:16,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-11-20 10:56:16,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550720532] [2022-11-20 10:56:16,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:16,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 10:56:16,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:16,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 10:56:16,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:56:16,448 INFO L87 Difference]: Start difference. First operand 217 states and 254 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 10:56:16,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:16,595 INFO L93 Difference]: Finished difference Result 237 states and 258 transitions. [2022-11-20 10:56:16,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-20 10:56:16,595 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2022-11-20 10:56:16,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:16,597 INFO L225 Difference]: With dead ends: 237 [2022-11-20 10:56:16,597 INFO L226 Difference]: Without dead ends: 237 [2022-11-20 10:56:16,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-11-20 10:56:16,598 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 48 mSDsluCounter, 410 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:16,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 510 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 10:56:16,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-11-20 10:56:16,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 222. [2022-11-20 10:56:16,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 178 states have (on average 1.3258426966292134) internal successors, (236), 207 states have internal predecessors, (236), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-20 10:56:16,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 258 transitions. [2022-11-20 10:56:16,608 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 258 transitions. Word has length 46 [2022-11-20 10:56:16,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:16,608 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 258 transitions. [2022-11-20 10:56:16,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 10:56:16,608 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 258 transitions. [2022-11-20 10:56:16,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-20 10:56:16,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:16,609 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:16,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:16,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-20 10:56:16,816 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:16,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:16,816 INFO L85 PathProgramCache]: Analyzing trace with hash -1542173709, now seen corresponding path program 1 times [2022-11-20 10:56:16,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:16,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459735220] [2022-11-20 10:56:16,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:16,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:16,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:17,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:17,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:17,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-11-20 10:56:17,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:18,250 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:56:18,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:18,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459735220] [2022-11-20 10:56:18,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459735220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:18,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302078463] [2022-11-20 10:56:18,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:18,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:18,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:18,252 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:18,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 10:56:18,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:18,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-20 10:56:18,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:18,582 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:18,657 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_3064 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_3064))) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2022-11-20 10:56:18,736 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:56:18,736 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:56:18,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:18,998 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:18,999 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:56:19,014 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:56:19,114 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:19,114 INFO L350 Elim1Store]: Elim1 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 31 treesize of output 37 [2022-11-20 10:56:19,137 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:56:19,272 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:19,281 INFO L321 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-11-20 10:56:19,281 INFO L350 Elim1Store]: Elim1 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 29 treesize of output 28 [2022-11-20 10:56:19,469 INFO L321 Elim1Store]: treesize reduction 54, result has 36.5 percent of original size [2022-11-20 10:56:19,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 28 treesize of output 45 [2022-11-20 10:56:19,551 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:56:19,680 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:56:19,728 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 36 [2022-11-20 10:56:19,792 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:19,792 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2022-11-20 10:56:19,838 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 18 not checked. [2022-11-20 10:56:19,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:22,248 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:22,249 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 34 [2022-11-20 10:56:22,262 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:22,263 INFO L350 Elim1Store]: Elim1 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 170 treesize of output 118 [2022-11-20 10:56:22,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 86 treesize of output 78 [2022-11-20 10:56:22,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 36 [2022-11-20 10:56:22,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302078463] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:22,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:56:22,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14] total 32 [2022-11-20 10:56:22,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058364871] [2022-11-20 10:56:22,639 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:22,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 10:56:22,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:22,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 10:56:22,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1192, Unknown=12, NotChecked=70, Total=1406 [2022-11-20 10:56:22,640 INFO L87 Difference]: Start difference. First operand 222 states and 258 transitions. Second operand has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:56:24,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:24,802 INFO L93 Difference]: Finished difference Result 315 states and 381 transitions. [2022-11-20 10:56:24,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-20 10:56:24,803 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 58 [2022-11-20 10:56:24,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:24,805 INFO L225 Difference]: With dead ends: 315 [2022-11-20 10:56:24,805 INFO L226 Difference]: Without dead ends: 315 [2022-11-20 10:56:24,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 60 SyntacticMatches, 11 SemanticMatches, 54 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=379, Invalid=2583, Unknown=12, NotChecked=106, Total=3080 [2022-11-20 10:56:24,806 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 226 mSDsluCounter, 825 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:24,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [226 Valid, 895 Invalid, 960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 668 Invalid, 0 Unknown, 266 Unchecked, 0.6s Time] [2022-11-20 10:56:24,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2022-11-20 10:56:24,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 246. [2022-11-20 10:56:24,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 202 states have (on average 1.316831683168317) internal successors, (266), 229 states have internal predecessors, (266), 10 states have call successors, (10), 8 states have call predecessors, (10), 5 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-20 10:56:24,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 288 transitions. [2022-11-20 10:56:24,815 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 288 transitions. Word has length 58 [2022-11-20 10:56:24,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:24,816 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 288 transitions. [2022-11-20 10:56:24,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:56:24,816 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 288 transitions. [2022-11-20 10:56:24,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-20 10:56:24,817 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:24,817 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:24,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:25,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-20 10:56:25,024 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:25,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:25,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1542173708, now seen corresponding path program 1 times [2022-11-20 10:56:25,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:25,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314516393] [2022-11-20 10:56:25,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:25,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:25,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:26,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:26,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:26,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-11-20 10:56:26,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:26,901 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:56:26,902 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:26,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314516393] [2022-11-20 10:56:26,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314516393] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:26,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831191713] [2022-11-20 10:56:26,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:26,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:26,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:26,904 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:26,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 10:56:27,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:27,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-20 10:56:27,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:27,229 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:27,302 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_3370 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_3370))) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2022-11-20 10:56:27,390 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:56:27,390 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:56:27,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:27,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:27,764 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:27,764 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:56:27,781 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:27,782 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 22 [2022-11-20 10:56:27,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:56:27,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:56:27,931 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:27,932 INFO L350 Elim1Store]: Elim1 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 40 treesize of output 46 [2022-11-20 10:56:27,951 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:27,951 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 44 [2022-11-20 10:56:27,981 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:56:28,024 WARN L207 Elim1Store]: Array PQE input equivalent to false [2022-11-20 10:56:28,215 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:28,224 INFO L321 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2022-11-20 10:56:28,225 INFO L350 Elim1Store]: Elim1 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 29 treesize of output 28 [2022-11-20 10:56:28,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:28,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-20 10:56:28,451 INFO L321 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2022-11-20 10:56:28,452 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 24 [2022-11-20 10:56:28,530 INFO L350 Elim1Store]: Elim1 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 46 treesize of output 44 [2022-11-20 10:56:28,536 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:28,693 INFO L350 Elim1Store]: Elim1 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 46 treesize of output 44 [2022-11-20 10:56:28,701 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:28,758 INFO L350 Elim1Store]: Elim1 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 46 treesize of output 44 [2022-11-20 10:56:28,766 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:28,844 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:28,845 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 21 [2022-11-20 10:56:28,849 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:28,850 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 14 [2022-11-20 10:56:28,889 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 18 not checked. [2022-11-20 10:56:28,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:28,988 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_append_~head.offset 4))) (and (forall ((v_ArrVal_3385 (Array Int Int)) (v_ArrVal_3386 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3386) c_append_~head.base) .cse0) 9) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_3385) c_append_~head.base) .cse0)))) (forall ((v_ArrVal_3386 (Array Int Int))) (<= 0 (+ 5 (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_3386) c_append_~head.base) .cse0)))))) is different from false [2022-11-20 10:56:29,543 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:29,544 INFO L350 Elim1Store]: Elim1 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 102 treesize of output 103 [2022-11-20 10:56:29,560 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:29,560 INFO L350 Elim1Store]: Elim1 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 122 treesize of output 113 [2022-11-20 10:56:29,577 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:29,578 INFO L350 Elim1Store]: Elim1 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 481 treesize of output 345 [2022-11-20 10:56:29,601 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:29,601 INFO L350 Elim1Store]: Elim1 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 1940 treesize of output 1828 [2022-11-20 10:56:29,670 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:29,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 3160 treesize of output 2910 [2022-11-20 10:56:29,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2831 treesize of output 2695 [2022-11-20 10:56:29,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2736 treesize of output 2596 [2022-11-20 10:56:29,813 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2567 treesize of output 2311 [2022-11-20 10:56:29,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2348 treesize of output 2080 [2022-11-20 10:56:29,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 2055 treesize of output 2039 [2022-11-20 10:56:33,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831191713] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:33,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:56:33,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14] total 32 [2022-11-20 10:56:33,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778947404] [2022-11-20 10:56:33,496 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:33,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 10:56:33,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:33,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 10:56:33,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1215, Unknown=3, NotChecked=142, Total=1482 [2022-11-20 10:56:33,498 INFO L87 Difference]: Start difference. First operand 246 states and 288 transitions. Second operand has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:56:36,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:36,515 INFO L93 Difference]: Finished difference Result 370 states and 433 transitions. [2022-11-20 10:56:36,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-20 10:56:36,516 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 58 [2022-11-20 10:56:36,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:36,518 INFO L225 Difference]: With dead ends: 370 [2022-11-20 10:56:36,518 INFO L226 Difference]: Without dead ends: 370 [2022-11-20 10:56:36,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 55 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=330, Invalid=2645, Unknown=3, NotChecked=214, Total=3192 [2022-11-20 10:56:36,519 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 278 mSDsluCounter, 1250 mSDsCounter, 0 mSdLazyCounter, 863 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 1342 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 863 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 752 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:36,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [278 Valid, 1342 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 863 Invalid, 0 Unknown, 752 Unchecked, 0.8s Time] [2022-11-20 10:56:36,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2022-11-20 10:56:36,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 246. [2022-11-20 10:56:36,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 202 states have (on average 1.306930693069307) internal successors, (264), 229 states have internal predecessors, (264), 10 states have call successors, (10), 8 states have call predecessors, (10), 5 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-20 10:56:36,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 286 transitions. [2022-11-20 10:56:36,529 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 286 transitions. Word has length 58 [2022-11-20 10:56:36,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:36,529 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 286 transitions. [2022-11-20 10:56:36,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.28125) internal successors, (105), 29 states have internal predecessors, (105), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:56:36,530 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 286 transitions. [2022-11-20 10:56:36,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-20 10:56:36,530 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:36,530 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:36,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:36,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-20 10:56:36,744 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:36,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:36,744 INFO L85 PathProgramCache]: Analyzing trace with hash 2096051094, now seen corresponding path program 1 times [2022-11-20 10:56:36,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:36,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549503610] [2022-11-20 10:56:36,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:36,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:36,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:37,346 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:37,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:37,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-11-20 10:56:37,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:56:37,741 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:37,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549503610] [2022-11-20 10:56:37,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549503610] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:37,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599242554] [2022-11-20 10:56:37,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:37,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:37,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:37,743 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:37,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-20 10:56:38,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:38,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-20 10:56:38,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:38,064 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:38,125 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_3689 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_3689))) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2022-11-20 10:56:38,198 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:56:38,198 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:56:38,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:56:38,415 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:56:38,475 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:38,476 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 23 treesize of output 27 [2022-11-20 10:56:38,481 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:38,482 INFO L350 Elim1Store]: Elim1 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 13 treesize of output 7 [2022-11-20 10:56:38,549 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:56:38,549 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 28 treesize of output 32 [2022-11-20 10:56:38,644 INFO L321 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2022-11-20 10:56:38,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 15 treesize of output 15 [2022-11-20 10:56:38,766 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:56:38,767 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:38,812 INFO L350 Elim1Store]: Elim1 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 34 treesize of output 30 [2022-11-20 10:56:38,868 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:38,868 INFO L350 Elim1Store]: Elim1 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 1 case distinctions, treesize of input 35 treesize of output 15 [2022-11-20 10:56:38,873 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 17 not checked. [2022-11-20 10:56:38,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:38,941 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_75 Int) (v_ArrVal_3696 (Array Int Int))) (or (not (= (select |c_#valid| v_append_~node~0.base_75) 0)) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_75 v_ArrVal_3696) |c_append_#in~head.base|) |c_append_#in~head.offset|) 0)))) is different from false [2022-11-20 10:56:38,949 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_append_~node~0.base_75 Int) (v_ArrVal_3696 (Array Int Int))) (or (not (= (select |c_#valid| v_append_~node~0.base_75) 0)) (not (= (select (select (store |c_#memory_$Pointer$.base| v_append_~node~0.base_75 v_ArrVal_3696) |c_ULTIMATE.start_main_~list2~0#1.base|) |c_ULTIMATE.start_main_~list2~0#1.offset|) 0)))) is different from false [2022-11-20 10:56:39,053 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:39,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 33 [2022-11-20 10:56:39,057 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:39,061 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:39,061 INFO L350 Elim1Store]: Elim1 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 72 treesize of output 34 [2022-11-20 10:56:39,067 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-20 10:56:39,067 INFO L350 Elim1Store]: Elim1 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 13 treesize of output 12 [2022-11-20 10:56:39,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2022-11-20 10:56:39,311 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:39,311 INFO L350 Elim1Store]: Elim1 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 2 case distinctions, treesize of input 27 treesize of output 33 [2022-11-20 10:56:39,329 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:39,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 75 treesize of output 85 [2022-11-20 10:56:39,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 48 [2022-11-20 10:56:39,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 46 [2022-11-20 10:56:39,735 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:39,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 56 treesize of output 96 [2022-11-20 10:56:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2022-11-20 10:56:40,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599242554] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:56:40,254 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:56:40,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 16] total 43 [2022-11-20 10:56:40,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572925694] [2022-11-20 10:56:40,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:40,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-20 10:56:40,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:40,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-20 10:56:40,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1377, Unknown=11, NotChecked=234, Total=1806 [2022-11-20 10:56:40,256 INFO L87 Difference]: Start difference. First operand 246 states and 286 transitions. Second operand has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:56:42,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:42,895 INFO L93 Difference]: Finished difference Result 406 states and 449 transitions. [2022-11-20 10:56:42,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-20 10:56:42,895 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 60 [2022-11-20 10:56:42,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:42,897 INFO L225 Difference]: With dead ends: 406 [2022-11-20 10:56:42,898 INFO L226 Difference]: Without dead ends: 406 [2022-11-20 10:56:42,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 101 SyntacticMatches, 11 SemanticMatches, 59 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 977 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=537, Invalid=2770, Unknown=11, NotChecked=342, Total=3660 [2022-11-20 10:56:42,899 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 490 mSDsluCounter, 1384 mSDsCounter, 0 mSdLazyCounter, 1291 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 1470 SdHoareTripleChecker+Invalid, 1989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 1291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 608 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:42,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 1470 Invalid, 1989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 1291 Invalid, 0 Unknown, 608 Unchecked, 1.0s Time] [2022-11-20 10:56:42,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2022-11-20 10:56:42,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 278. [2022-11-20 10:56:42,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 229 states have (on average 1.275109170305677) internal successors, (292), 256 states have internal predecessors, (292), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (19), 12 states have call predecessors, (19), 13 states have call successors, (19) [2022-11-20 10:56:42,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 324 transitions. [2022-11-20 10:56:42,908 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 324 transitions. Word has length 60 [2022-11-20 10:56:42,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:42,908 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 324 transitions. [2022-11-20 10:56:42,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.1627906976744184) internal successors, (136), 37 states have internal predecessors, (136), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:56:42,908 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 324 transitions. [2022-11-20 10:56:42,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-20 10:56:42,909 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:42,909 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:42,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:43,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-20 10:56:43,118 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:43,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:43,119 INFO L85 PathProgramCache]: Analyzing trace with hash 115708675, now seen corresponding path program 1 times [2022-11-20 10:56:43,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:43,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083056218] [2022-11-20 10:56:43,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:43,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:43,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:43,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:43,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:43,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:56:43,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:44,095 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:56:44,095 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:44,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083056218] [2022-11-20 10:56:44,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083056218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:44,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986349820] [2022-11-20 10:56:44,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:44,096 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:44,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:44,099 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:44,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-20 10:56:44,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:44,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-20 10:56:44,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:44,534 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:44,642 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:44,781 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-20 10:56:44,781 INFO L350 Elim1Store]: Elim1 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 28 treesize of output 45 [2022-11-20 10:56:44,844 INFO L350 Elim1Store]: Elim1 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 28 treesize of output 28 [2022-11-20 10:56:45,017 INFO L350 Elim1Store]: Elim1 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 28 treesize of output 28 [2022-11-20 10:56:45,066 INFO L350 Elim1Store]: Elim1 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 28 treesize of output 28 [2022-11-20 10:56:45,120 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:45,121 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2022-11-20 10:56:45,138 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:56:45,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:45,494 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:45,494 INFO L350 Elim1Store]: Elim1 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 30 treesize of output 31 [2022-11-20 10:56:45,508 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-20 10:56:45,509 INFO L350 Elim1Store]: Elim1 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 84 treesize of output 57 [2022-11-20 10:56:45,571 INFO L321 Elim1Store]: treesize reduction 10, result has 83.6 percent of original size [2022-11-20 10:56:45,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 192 treesize of output 228 [2022-11-20 10:56:45,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2022-11-20 10:56:45,757 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:45,757 INFO L350 Elim1Store]: Elim1 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 27 treesize of output 28 [2022-11-20 10:56:45,770 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:45,770 INFO L350 Elim1Store]: Elim1 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 46 treesize of output 45 [2022-11-20 10:56:45,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-20 10:56:48,301 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 14 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:56:48,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986349820] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:56:48,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:56:48,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 28 [2022-11-20 10:56:48,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189422720] [2022-11-20 10:56:48,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:56:48,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-20 10:56:48,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:56:48,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-20 10:56:48,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=712, Unknown=5, NotChecked=0, Total=812 [2022-11-20 10:56:48,304 INFO L87 Difference]: Start difference. First operand 278 states and 324 transitions. Second operand has 29 states, 28 states have (on average 3.9285714285714284) internal successors, (110), 25 states have internal predecessors, (110), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 10:56:49,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:56:49,188 INFO L93 Difference]: Finished difference Result 306 states and 349 transitions. [2022-11-20 10:56:49,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 10:56:49,189 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.9285714285714284) internal successors, (110), 25 states have internal predecessors, (110), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 60 [2022-11-20 10:56:49,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:56:49,190 INFO L225 Difference]: With dead ends: 306 [2022-11-20 10:56:49,190 INFO L226 Difference]: Without dead ends: 306 [2022-11-20 10:56:49,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 99 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=168, Invalid=1017, Unknown=5, NotChecked=0, Total=1190 [2022-11-20 10:56:49,191 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 237 mSDsluCounter, 1080 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 1152 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 407 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 10:56:49,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 1152 Invalid, 1041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 615 Invalid, 0 Unknown, 407 Unchecked, 0.5s Time] [2022-11-20 10:56:49,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2022-11-20 10:56:49,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 278. [2022-11-20 10:56:49,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 229 states have (on average 1.2707423580786026) internal successors, (291), 256 states have internal predecessors, (291), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (19), 12 states have call predecessors, (19), 13 states have call successors, (19) [2022-11-20 10:56:49,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 323 transitions. [2022-11-20 10:56:49,200 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 323 transitions. Word has length 60 [2022-11-20 10:56:49,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:56:49,200 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 323 transitions. [2022-11-20 10:56:49,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.9285714285714284) internal successors, (110), 25 states have internal predecessors, (110), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 10:56:49,201 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 323 transitions. [2022-11-20 10:56:49,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-20 10:56:49,202 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:56:49,202 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:56:49,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-20 10:56:49,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-20 10:56:49,408 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting appendErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:56:49,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:56:49,409 INFO L85 PathProgramCache]: Analyzing trace with hash 115708676, now seen corresponding path program 1 times [2022-11-20 10:56:49,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:56:49,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710097081] [2022-11-20 10:56:49,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:49,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:56:49,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:50,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:56:50,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:50,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:56:50,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:50,609 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:56:50,609 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:56:50,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710097081] [2022-11-20 10:56:50,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710097081] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:56:50,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970081518] [2022-11-20 10:56:50,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:56:50,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:56:50,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:56:50,611 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:56:50,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-20 10:56:50,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:56:51,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-20 10:56:51,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:56:51,052 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:56:51,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:51,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:56:51,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:56:51,609 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-11-20 10:56:51,638 INFO L321 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2022-11-20 10:56:51,639 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 24 [2022-11-20 10:56:51,718 INFO L350 Elim1Store]: Elim1 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 36 treesize of output 36 [2022-11-20 10:56:51,723 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:51,857 INFO L350 Elim1Store]: Elim1 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 36 treesize of output 36 [2022-11-20 10:56:51,864 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:51,918 INFO L350 Elim1Store]: Elim1 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 36 treesize of output 36 [2022-11-20 10:56:51,925 INFO L350 Elim1Store]: Elim1 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 35 treesize of output 35 [2022-11-20 10:56:51,996 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:51,997 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-20 10:56:52,001 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:52,003 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:52,003 INFO L350 Elim1Store]: Elim1 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 32 treesize of output 17 [2022-11-20 10:56:52,037 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:56:52,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:56:52,716 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:52,717 INFO L350 Elim1Store]: Elim1 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 93 treesize of output 94 [2022-11-20 10:56:52,729 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:52,729 INFO L350 Elim1Store]: Elim1 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 95 treesize of output 86 [2022-11-20 10:56:52,746 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-20 10:56:52,747 INFO L350 Elim1Store]: Elim1 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 140 treesize of output 113 [2022-11-20 10:56:52,753 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:52,754 INFO L350 Elim1Store]: Elim1 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 172 treesize of output 142 [2022-11-20 10:56:52,783 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:52,784 INFO L350 Elim1Store]: Elim1 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 207 treesize of output 221 [2022-11-20 10:56:52,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 185 treesize of output 169 [2022-11-20 10:56:52,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 194 treesize of output 170 [2022-11-20 10:56:52,827 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:52,827 INFO L350 Elim1Store]: Elim1 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 169 treesize of output 187 [2022-11-20 10:56:52,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 149 treesize of output 145 [2022-11-20 10:56:55,180 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,181 INFO L350 Elim1Store]: Elim1 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 48 treesize of output 49 [2022-11-20 10:56:55,190 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,190 INFO L350 Elim1Store]: Elim1 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 38 treesize of output 39 [2022-11-20 10:56:55,203 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,203 INFO L350 Elim1Store]: Elim1 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 68 treesize of output 67 [2022-11-20 10:56:55,219 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,220 INFO L350 Elim1Store]: Elim1 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 108 treesize of output 101 [2022-11-20 10:56:55,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 38 [2022-11-20 10:56:55,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 70 [2022-11-20 10:56:55,400 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,400 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 25 [2022-11-20 10:56:55,404 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:56:55,416 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:56:55,416 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 21 [2022-11-20 10:57:29,703 WARN L233 SmtUtils]: Spent 34.18s on a formula simplification. DAG size of input: 52 DAG size of output: 44 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-20 10:57:29,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 107 treesize of output 103 [2022-11-20 10:57:30,492 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 14 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:57:30,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970081518] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:57:30,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:57:30,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 11] total 32 [2022-11-20 10:57:30,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040743045] [2022-11-20 10:57:30,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:57:30,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-20 10:57:30,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:57:30,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-20 10:57:30,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=931, Unknown=13, NotChecked=0, Total=1056 [2022-11-20 10:57:30,494 INFO L87 Difference]: Start difference. First operand 278 states and 323 transitions. Second operand has 33 states, 32 states have (on average 3.90625) internal successors, (125), 29 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 10:57:31,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:57:31,640 INFO L93 Difference]: Finished difference Result 279 states and 323 transitions. [2022-11-20 10:57:31,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 10:57:31,655 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.90625) internal successors, (125), 29 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) Word has length 60 [2022-11-20 10:57:31,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:57:31,656 INFO L225 Difference]: With dead ends: 279 [2022-11-20 10:57:31,657 INFO L226 Difference]: Without dead ends: 279 [2022-11-20 10:57:31,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 106 SyntacticMatches, 7 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 38.4s TimeCoverageRelationStatistics Valid=233, Invalid=1476, Unknown=13, NotChecked=0, Total=1722 [2022-11-20 10:57:31,659 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 133 mSDsluCounter, 1096 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 1185 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 386 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:57:31,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 1185 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 372 Invalid, 0 Unknown, 386 Unchecked, 0.3s Time] [2022-11-20 10:57:31,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-11-20 10:57:31,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 266. [2022-11-20 10:57:31,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 217 states have (on average 1.2811059907834101) internal successors, (278), 245 states have internal predecessors, (278), 13 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (19), 12 states have call predecessors, (19), 13 states have call successors, (19) [2022-11-20 10:57:31,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 310 transitions. [2022-11-20 10:57:31,675 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 310 transitions. Word has length 60 [2022-11-20 10:57:31,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:57:31,675 INFO L495 AbstractCegarLoop]: Abstraction has 266 states and 310 transitions. [2022-11-20 10:57:31,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.90625) internal successors, (125), 29 states have internal predecessors, (125), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-20 10:57:31,676 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 310 transitions. [2022-11-20 10:57:31,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-20 10:57:31,676 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:57:31,676 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:57:31,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-20 10:57:31,883 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:57:31,883 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:57:31,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:57:31,884 INFO L85 PathProgramCache]: Analyzing trace with hash -452149625, now seen corresponding path program 1 times [2022-11-20 10:57:31,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:57:31,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415894583] [2022-11-20 10:57:31,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:57:31,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:57:31,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:33,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:57:33,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:36,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:57:36,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:40,205 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:57:40,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:57:40,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415894583] [2022-11-20 10:57:40,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415894583] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:57:40,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974155189] [2022-11-20 10:57:40,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:57:40,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:57:40,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:57:40,207 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:57:40,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-20 10:57:40,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:40,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-20 10:57:40,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:57:40,602 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:40,630 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:57:40,630 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:57:40,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:57:40,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:57:40,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:40,802 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:57:40,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:40,817 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:57:41,469 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2022-11-20 10:57:41,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:41,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:41,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2022-11-20 10:57:42,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:42,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:42,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2022-11-20 10:57:42,045 INFO L321 Elim1Store]: treesize reduction 65, result has 28.6 percent of original size [2022-11-20 10:57:42,045 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2022-11-20 10:57:43,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,334 INFO L321 Elim1Store]: treesize reduction 38, result has 34.5 percent of original size [2022-11-20 10:57:43,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 65 [2022-11-20 10:57:43,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:57:43,364 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-20 10:57:43,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 34 [2022-11-20 10:57:43,373 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:57:43,374 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 27 [2022-11-20 10:57:43,407 INFO L321 Elim1Store]: treesize reduction 40, result has 32.2 percent of original size [2022-11-20 10:57:43,407 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 24 treesize of output 28 [2022-11-20 10:57:43,724 INFO L321 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2022-11-20 10:57:43,724 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:43,805 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:43,812 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:43,912 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:43,914 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:57:43,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:57:43,940 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_4636 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_4636) c_append_~head.base) c_append_~head.offset) 0)) (forall ((v_ArrVal_4637 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_4637) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2022-11-20 10:57:45,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974155189] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:57:45,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:57:45,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 45 [2022-11-20 10:57:45,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049876422] [2022-11-20 10:57:45,339 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:57:45,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-20 10:57:45,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:57:45,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-20 10:57:45,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2032, Unknown=45, NotChecked=92, Total=2352 [2022-11-20 10:57:45,341 INFO L87 Difference]: Start difference. First operand 266 states and 310 transitions. Second operand has 45 states, 45 states have (on average 2.1777777777777776) internal successors, (98), 41 states have internal predecessors, (98), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 10:57:49,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:57:49,892 INFO L93 Difference]: Finished difference Result 277 states and 319 transitions. [2022-11-20 10:57:49,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-20 10:57:49,902 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.1777777777777776) internal successors, (98), 41 states have internal predecessors, (98), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 61 [2022-11-20 10:57:49,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:57:49,903 INFO L225 Difference]: With dead ends: 277 [2022-11-20 10:57:49,904 INFO L226 Difference]: Without dead ends: 277 [2022-11-20 10:57:49,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 63 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=386, Invalid=3552, Unknown=98, NotChecked=124, Total=4160 [2022-11-20 10:57:49,905 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 104 mSDsluCounter, 1179 mSDsCounter, 0 mSdLazyCounter, 625 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 1264 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 497 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:57:49,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 1264 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 625 Invalid, 0 Unknown, 497 Unchecked, 1.3s Time] [2022-11-20 10:57:49,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2022-11-20 10:57:49,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 273. [2022-11-20 10:57:49,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 223 states have (on average 1.2600896860986548) internal successors, (281), 251 states have internal predecessors, (281), 14 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (19), 12 states have call predecessors, (19), 14 states have call successors, (19) [2022-11-20 10:57:49,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 314 transitions. [2022-11-20 10:57:49,913 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 314 transitions. Word has length 61 [2022-11-20 10:57:49,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:57:49,913 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 314 transitions. [2022-11-20 10:57:49,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.1777777777777776) internal successors, (98), 41 states have internal predecessors, (98), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 10:57:49,914 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 314 transitions. [2022-11-20 10:57:49,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-20 10:57:49,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:57:49,915 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:57:49,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-20 10:57:50,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-20 10:57:50,122 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:57:50,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:57:50,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1637175594, now seen corresponding path program 2 times [2022-11-20 10:57:50,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:57:50,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509281056] [2022-11-20 10:57:50,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:57:50,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:57:50,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:51,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:57:51,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:54,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:57:54,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:57:58,636 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:57:58,636 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:57:58,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509281056] [2022-11-20 10:57:58,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509281056] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:57:58,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930500659] [2022-11-20 10:57:58,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-20 10:57:58,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:57:58,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:57:58,638 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:57:58,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-20 10:57:59,146 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-20 10:57:59,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 10:57:59,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 111 conjunts are in the unsatisfiable core [2022-11-20 10:57:59,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:57:59,162 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:57:59,195 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:57:59,195 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:57:59,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:57:59,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:57:59,777 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2022-11-20 10:58:00,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:00,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:00,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 27 [2022-11-20 10:58:00,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:00,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:00,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 27 [2022-11-20 10:58:00,216 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:58:00,249 INFO L321 Elim1Store]: treesize reduction 49, result has 34.7 percent of original size [2022-11-20 10:58:00,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2022-11-20 10:58:01,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,585 INFO L321 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2022-11-20 10:58:01,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 72 [2022-11-20 10:58:01,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:01,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 8 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 30 [2022-11-20 10:58:01,649 INFO L321 Elim1Store]: treesize reduction 66, result has 35.3 percent of original size [2022-11-20 10:58:01,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 31 treesize of output 53 [2022-11-20 10:58:01,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 14 [2022-11-20 10:58:02,019 INFO L321 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2022-11-20 10:58:02,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2022-11-20 10:58:02,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 10:58:02,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-20 10:58:02,078 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:02,080 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:02,197 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-20 10:58:02,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:03,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930500659] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:03,538 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:58:03,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 26] total 43 [2022-11-20 10:58:03,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483353965] [2022-11-20 10:58:03,539 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:03,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-20 10:58:03,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:03,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-20 10:58:03,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2133, Unknown=43, NotChecked=0, Total=2352 [2022-11-20 10:58:03,541 INFO L87 Difference]: Start difference. First operand 273 states and 314 transitions. Second operand has 43 states, 43 states have (on average 2.2093023255813953) internal successors, (95), 39 states have internal predecessors, (95), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:58:07,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:07,146 INFO L93 Difference]: Finished difference Result 286 states and 331 transitions. [2022-11-20 10:58:07,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-20 10:58:07,147 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.2093023255813953) internal successors, (95), 39 states have internal predecessors, (95), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 63 [2022-11-20 10:58:07,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:07,149 INFO L225 Difference]: With dead ends: 286 [2022-11-20 10:58:07,149 INFO L226 Difference]: Without dead ends: 286 [2022-11-20 10:58:07,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 72 SyntacticMatches, 4 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1205 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=445, Invalid=4139, Unknown=108, NotChecked=0, Total=4692 [2022-11-20 10:58:07,152 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 69 mSDsluCounter, 929 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 1013 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 317 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:07,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 1013 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 403 Invalid, 0 Unknown, 317 Unchecked, 0.7s Time] [2022-11-20 10:58:07,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-11-20 10:58:07,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 275. [2022-11-20 10:58:07,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 225 states have (on average 1.2577777777777779) internal successors, (283), 253 states have internal predecessors, (283), 14 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:07,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 315 transitions. [2022-11-20 10:58:07,160 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 315 transitions. Word has length 63 [2022-11-20 10:58:07,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:07,161 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 315 transitions. [2022-11-20 10:58:07,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.2093023255813953) internal successors, (95), 39 states have internal predecessors, (95), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-20 10:58:07,161 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 315 transitions. [2022-11-20 10:58:07,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-20 10:58:07,162 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:07,162 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:07,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:07,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:07,370 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:07,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:07,370 INFO L85 PathProgramCache]: Analyzing trace with hash 131306784, now seen corresponding path program 1 times [2022-11-20 10:58:07,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:07,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200466439] [2022-11-20 10:58:07,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:07,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:07,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:07,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:07,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:07,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2022-11-20 10:58:07,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:07,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-11-20 10:58:07,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:07,783 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 23 proven. 5 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-20 10:58:07,783 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:58:07,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200466439] [2022-11-20 10:58:07,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200466439] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:07,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193353256] [2022-11-20 10:58:07,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:07,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:07,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:58:07,785 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:58:07,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-20 10:58:08,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:08,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-20 10:58:08,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:58:08,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:08,364 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:08,373 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:58:08,373 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:08,379 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 26 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-20 10:58:08,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:08,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 41 [2022-11-20 10:58:08,623 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:58:08,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 62 [2022-11-20 10:58:08,774 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-20 10:58:08,775 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 30 [2022-11-20 10:58:08,894 INFO L321 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2022-11-20 10:58:08,894 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 37 [2022-11-20 10:58:08,952 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 21 proven. 7 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-20 10:58:08,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193353256] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 10:58:08,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-20 10:58:08,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 18 [2022-11-20 10:58:08,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980152132] [2022-11-20 10:58:08,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:08,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-20 10:58:08,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:08,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-20 10:58:08,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2022-11-20 10:58:08,955 INFO L87 Difference]: Start difference. First operand 275 states and 315 transitions. Second operand has 19 states, 18 states have (on average 4.888888888888889) internal successors, (88), 15 states have internal predecessors, (88), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 10:58:09,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:09,358 INFO L93 Difference]: Finished difference Result 310 states and 339 transitions. [2022-11-20 10:58:09,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 10:58:09,359 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 4.888888888888889) internal successors, (88), 15 states have internal predecessors, (88), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) Word has length 68 [2022-11-20 10:58:09,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:09,360 INFO L225 Difference]: With dead ends: 310 [2022-11-20 10:58:09,361 INFO L226 Difference]: Without dead ends: 310 [2022-11-20 10:58:09,361 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2022-11-20 10:58:09,362 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 268 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 228 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:09,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 504 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 382 Invalid, 0 Unknown, 228 Unchecked, 0.3s Time] [2022-11-20 10:58:09,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2022-11-20 10:58:09,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 293. [2022-11-20 10:58:09,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 242 states have (on average 1.2272727272727273) internal successors, (297), 271 states have internal predecessors, (297), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:09,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 329 transitions. [2022-11-20 10:58:09,375 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 329 transitions. Word has length 68 [2022-11-20 10:58:09,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:09,377 INFO L495 AbstractCegarLoop]: Abstraction has 293 states and 329 transitions. [2022-11-20 10:58:09,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 4.888888888888889) internal successors, (88), 15 states have internal predecessors, (88), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-20 10:58:09,377 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 329 transitions. [2022-11-20 10:58:09,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-20 10:58:09,378 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:09,378 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:09,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:09,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:09,586 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:09,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:09,586 INFO L85 PathProgramCache]: Analyzing trace with hash 575607356, now seen corresponding path program 1 times [2022-11-20 10:58:09,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:09,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047217623] [2022-11-20 10:58:09,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:09,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:09,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:10,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:10,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:10,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:58:10,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:10,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-20 10:58:10,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:10,499 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:58:10,499 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:58:10,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047217623] [2022-11-20 10:58:10,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047217623] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:10,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391006434] [2022-11-20 10:58:10,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:10,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:10,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:58:10,501 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:58:10,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-20 10:58:10,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:10,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-20 10:58:10,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:58:10,947 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:10,951 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:11,021 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_5731 Int)) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_5731))) (exists ((v_ArrVal_5732 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_5732))))) is different from true [2022-11-20 10:58:11,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:11,112 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:11,127 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:58:11,127 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:58:11,159 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_5733 Int)) (= (store |c_old(#length)| append_~node~0.base v_ArrVal_5733) |c_#length|)))) is different from true [2022-11-20 10:58:11,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:11,224 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:11,231 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:58:11,231 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:11,366 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:58:11,366 INFO L350 Elim1Store]: Elim1 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 18 [2022-11-20 10:58:11,487 INFO L321 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-11-20 10:58:11,488 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 10:58:11,547 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 3 trivial. 33 not checked. [2022-11-20 10:58:11,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:11,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391006434] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:11,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:58:11,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2022-11-20 10:58:11,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698776000] [2022-11-20 10:58:11,965 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:11,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 10:58:11,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:11,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 10:58:11,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=518, Unknown=5, NotChecked=94, Total=702 [2022-11-20 10:58:11,966 INFO L87 Difference]: Start difference. First operand 293 states and 329 transitions. Second operand has 24 states, 23 states have (on average 5.130434782608695) internal successors, (118), 19 states have internal predecessors, (118), 5 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:14,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:14,145 INFO L93 Difference]: Finished difference Result 320 states and 354 transitions. [2022-11-20 10:58:14,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 10:58:14,145 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 5.130434782608695) internal successors, (118), 19 states have internal predecessors, (118), 5 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 72 [2022-11-20 10:58:14,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:14,147 INFO L225 Difference]: With dead ends: 320 [2022-11-20 10:58:14,147 INFO L226 Difference]: Without dead ends: 320 [2022-11-20 10:58:14,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 74 SyntacticMatches, 5 SemanticMatches, 34 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=171, Invalid=952, Unknown=7, NotChecked=130, Total=1260 [2022-11-20 10:58:14,148 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 155 mSDsluCounter, 768 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 647 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:14,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 853 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 531 Invalid, 0 Unknown, 647 Unchecked, 0.5s Time] [2022-11-20 10:58:14,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2022-11-20 10:58:14,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 292. [2022-11-20 10:58:14,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 242 states have (on average 1.2231404958677685) internal successors, (296), 270 states have internal predecessors, (296), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:14,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 328 transitions. [2022-11-20 10:58:14,156 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 328 transitions. Word has length 72 [2022-11-20 10:58:14,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:14,157 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 328 transitions. [2022-11-20 10:58:14,157 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 5.130434782608695) internal successors, (118), 19 states have internal predecessors, (118), 5 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:14,157 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 328 transitions. [2022-11-20 10:58:14,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-20 10:58:14,158 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:14,159 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:14,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:14,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-20 10:58:14,366 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting appendErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:14,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:14,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1885598739, now seen corresponding path program 1 times [2022-11-20 10:58:14,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:14,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183071278] [2022-11-20 10:58:14,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:14,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:14,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:15,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:15,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:15,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:58:15,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:15,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-20 10:58:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:58:15,443 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:58:15,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183071278] [2022-11-20 10:58:15,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183071278] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:15,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606077345] [2022-11-20 10:58:15,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:15,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:15,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:58:15,445 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:58:15,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-20 10:58:15,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:15,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-20 10:58:15,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:58:15,923 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:15,927 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:16,022 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_6101 Int)) (= (store |c_old(#length)| append_~node~0.base v_ArrVal_6101) |c_#length|)) (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_6102 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_6102))))) is different from true [2022-11-20 10:58:16,138 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:58:16,138 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:58:16,144 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:16,180 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (exists ((v_ArrVal_6103 Int)) (= (store |c_old(#length)| append_~node~0.base v_ArrVal_6103) |c_#length|)) (= (select |c_old(#valid)| append_~node~0.base) 0))) is different from true [2022-11-20 10:58:16,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:16,249 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:16,258 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:58:16,258 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:16,436 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:58:16,437 INFO L350 Elim1Store]: Elim1 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 18 [2022-11-20 10:58:16,591 INFO L321 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-11-20 10:58:16,592 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 17 treesize of output 38 [2022-11-20 10:58:16,739 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 38 not checked. [2022-11-20 10:58:16,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:17,028 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606077345] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:17,028 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:58:17,029 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13] total 23 [2022-11-20 10:58:17,029 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718727955] [2022-11-20 10:58:17,029 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:17,029 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-20 10:58:17,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:17,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-20 10:58:17,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=561, Unknown=6, NotChecked=98, Total=756 [2022-11-20 10:58:17,030 INFO L87 Difference]: Start difference. First operand 292 states and 328 transitions. Second operand has 24 states, 23 states have (on average 5.3478260869565215) internal successors, (123), 19 states have internal predecessors, (123), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:21,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:21,248 INFO L93 Difference]: Finished difference Result 295 states and 331 transitions. [2022-11-20 10:58:21,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 10:58:21,248 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 5.3478260869565215) internal successors, (123), 19 states have internal predecessors, (123), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 75 [2022-11-20 10:58:21,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:21,250 INFO L225 Difference]: With dead ends: 295 [2022-11-20 10:58:21,250 INFO L226 Difference]: Without dead ends: 295 [2022-11-20 10:58:21,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=178, Invalid=1012, Unknown=8, NotChecked=134, Total=1332 [2022-11-20 10:58:21,251 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 114 mSDsluCounter, 1089 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 1192 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 547 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:21,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 1192 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 449 Invalid, 0 Unknown, 547 Unchecked, 0.4s Time] [2022-11-20 10:58:21,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2022-11-20 10:58:21,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 291. [2022-11-20 10:58:21,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 242 states have (on average 1.21900826446281) internal successors, (295), 269 states have internal predecessors, (295), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:21,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 327 transitions. [2022-11-20 10:58:21,259 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 327 transitions. Word has length 75 [2022-11-20 10:58:21,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:21,260 INFO L495 AbstractCegarLoop]: Abstraction has 291 states and 327 transitions. [2022-11-20 10:58:21,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 5.3478260869565215) internal successors, (123), 19 states have internal predecessors, (123), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:21,260 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 327 transitions. [2022-11-20 10:58:21,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-20 10:58:21,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:21,262 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:21,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:21,469 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-20 10:58:21,469 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting appendErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:21,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:21,469 INFO L85 PathProgramCache]: Analyzing trace with hash 1675987782, now seen corresponding path program 1 times [2022-11-20 10:58:21,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:21,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609274136] [2022-11-20 10:58:21,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:21,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:21,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:22,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:22,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:22,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:58:22,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:22,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-20 10:58:22,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:22,310 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-20 10:58:22,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:58:22,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609274136] [2022-11-20 10:58:22,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609274136] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:22,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173325823] [2022-11-20 10:58:22,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:22,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:22,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:58:22,312 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:58:22,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-20 10:58:22,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:22,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-20 10:58:22,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:58:22,806 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:22,896 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_6471 Int)) (= |c_#valid| (store |c_old(#valid)| append_~node~0.base v_ArrVal_6471))) (exists ((v_ArrVal_6470 Int)) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_6470))))) is different from true [2022-11-20 10:58:23,001 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:58:23,001 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:58:23,007 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 16 [2022-11-20 10:58:23,041 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int)) (and (= (select |c_old(#valid)| append_~node~0.base) 0) (exists ((v_ArrVal_6472 Int)) (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_6472))))) is different from true [2022-11-20 10:58:23,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:23,119 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 16 [2022-11-20 10:58:23,131 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-20 10:58:23,132 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:23,191 WARN L859 $PredicateComparison]: unable to prove that (exists ((append_~node~0.base Int) (v_ArrVal_6473 Int)) (and (= |c_#length| (store |c_old(#length)| append_~node~0.base v_ArrVal_6473)) (<= 9 v_ArrVal_6473))) is different from true [2022-11-20 10:58:23,263 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-20 10:58:23,263 INFO L350 Elim1Store]: Elim1 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 14 treesize of output 20 [2022-11-20 10:58:23,404 INFO L321 Elim1Store]: treesize reduction 20, result has 57.4 percent of original size [2022-11-20 10:58:23,404 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 19 treesize of output 40 [2022-11-20 10:58:23,550 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 46 not checked. [2022-11-20 10:58:23,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:23,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173325823] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:23,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:58:23,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-11-20 10:58:23,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667448826] [2022-11-20 10:58:23,815 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:23,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-20 10:58:23,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:23,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-20 10:58:23,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=564, Unknown=3, NotChecked=150, Total=812 [2022-11-20 10:58:23,817 INFO L87 Difference]: Start difference. First operand 291 states and 327 transitions. Second operand has 25 states, 24 states have (on average 5.291666666666667) internal successors, (127), 20 states have internal predecessors, (127), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:26,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:26,769 INFO L93 Difference]: Finished difference Result 329 states and 369 transitions. [2022-11-20 10:58:26,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 10:58:26,769 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 5.291666666666667) internal successors, (127), 20 states have internal predecessors, (127), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 76 [2022-11-20 10:58:26,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:26,771 INFO L225 Difference]: With dead ends: 329 [2022-11-20 10:58:26,772 INFO L226 Difference]: Without dead ends: 329 [2022-11-20 10:58:26,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 81 SyntacticMatches, 9 SemanticMatches, 35 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=168, Invalid=963, Unknown=3, NotChecked=198, Total=1332 [2022-11-20 10:58:26,773 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 128 mSDsluCounter, 733 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 812 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 577 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:26,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 812 Invalid, 1036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 444 Invalid, 0 Unknown, 577 Unchecked, 0.3s Time] [2022-11-20 10:58:26,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-11-20 10:58:26,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 289. [2022-11-20 10:58:26,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 241 states have (on average 1.2157676348547717) internal successors, (293), 267 states have internal predecessors, (293), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:26,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 325 transitions. [2022-11-20 10:58:26,781 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 325 transitions. Word has length 76 [2022-11-20 10:58:26,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:26,782 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 325 transitions. [2022-11-20 10:58:26,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 5.291666666666667) internal successors, (127), 20 states have internal predecessors, (127), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-20 10:58:26,782 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 325 transitions. [2022-11-20 10:58:26,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-20 10:58:26,783 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:26,784 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:26,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:26,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-20 10:58:26,992 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:26,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:26,992 INFO L85 PathProgramCache]: Analyzing trace with hash -233094045, now seen corresponding path program 3 times [2022-11-20 10:58:26,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:26,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401665743] [2022-11-20 10:58:26,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:26,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:27,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:29,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:29,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:31,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:58:31,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:35,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-20 10:58:35,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:39,467 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:58:39,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:58:39,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401665743] [2022-11-20 10:58:39,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401665743] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:39,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045067010] [2022-11-20 10:58:39,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 10:58:39,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:39,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:58:39,469 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:58:39,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-20 10:58:40,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 10:58:40,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 10:58:40,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 144 conjunts are in the unsatisfiable core [2022-11-20 10:58:40,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:58:40,505 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:40,533 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:58:40,533 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:58:40,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:58:40,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2022-11-20 10:58:40,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:40,765 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:58:40,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:40,773 INFO L350 Elim1Store]: Elim1 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 21 treesize of output 20 [2022-11-20 10:58:41,743 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2022-11-20 10:58:42,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:42,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:42,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2022-11-20 10:58:42,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:42,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:42,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 25 [2022-11-20 10:58:42,526 INFO L321 Elim1Store]: treesize reduction 65, result has 28.6 percent of original size [2022-11-20 10:58:42,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2022-11-20 10:58:44,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,742 INFO L321 Elim1Store]: treesize reduction 91, result has 27.2 percent of original size [2022-11-20 10:58:44,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 116 treesize of output 171 [2022-11-20 10:58:44,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:44,777 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-20 10:58:44,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 7 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 38 [2022-11-20 10:58:44,791 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:58:44,793 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 170 treesize of output 113 [2022-11-20 10:58:44,807 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:58:44,849 INFO L321 Elim1Store]: treesize reduction 49, result has 34.7 percent of original size [2022-11-20 10:58:44,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 46 [2022-11-20 10:58:44,896 INFO L321 Elim1Store]: treesize reduction 25, result has 35.9 percent of original size [2022-11-20 10:58:44,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 112 treesize of output 57 [2022-11-20 10:58:46,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,669 INFO L321 Elim1Store]: treesize reduction 42, result has 27.6 percent of original size [2022-11-20 10:58:46,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 64 [2022-11-20 10:58:46,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:58:46,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 28 [2022-11-20 10:58:46,735 INFO L321 Elim1Store]: treesize reduction 66, result has 32.7 percent of original size [2022-11-20 10:58:46,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 31 treesize of output 44 [2022-11-20 10:58:46,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 14 [2022-11-20 10:58:47,296 INFO L321 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2022-11-20 10:58:47,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2022-11-20 10:58:47,418 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:47,421 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:47,534 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:47,538 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:58:47,544 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 27 proven. 44 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:58:47,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 10:58:47,561 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_6908 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| c_append_~node~0.base v_ArrVal_6908) c_append_~head.base) c_append_~head.offset) 0)) (forall ((v_ArrVal_6907 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| c_append_~node~0.base v_ArrVal_6907) c_append_~head.base) c_append_~head.offset) 0))) is different from false [2022-11-20 10:58:49,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045067010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:58:49,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 10:58:49,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 58 [2022-11-20 10:58:49,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855685200] [2022-11-20 10:58:49,179 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 10:58:49,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-20 10:58:49,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-20 10:58:49,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-20 10:58:49,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=3300, Unknown=68, NotChecked=118, Total=3782 [2022-11-20 10:58:49,181 INFO L87 Difference]: Start difference. First operand 289 states and 325 transitions. Second operand has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 54 states have internal predecessors, (129), 8 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 10:58:56,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 10:58:56,152 INFO L93 Difference]: Finished difference Result 290 states and 323 transitions. [2022-11-20 10:58:56,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-20 10:58:56,152 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 54 states have internal predecessors, (129), 8 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 81 [2022-11-20 10:58:56,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 10:58:56,154 INFO L225 Difference]: With dead ends: 290 [2022-11-20 10:58:56,154 INFO L226 Difference]: Without dead ends: 290 [2022-11-20 10:58:56,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 84 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=651, Invalid=6351, Unknown=142, NotChecked=166, Total=7310 [2022-11-20 10:58:56,155 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 142 mSDsluCounter, 1167 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 1259 SdHoareTripleChecker+Invalid, 904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 359 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-20 10:58:56,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 1259 Invalid, 904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 530 Invalid, 0 Unknown, 359 Unchecked, 0.9s Time] [2022-11-20 10:58:56,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2022-11-20 10:58:56,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 288. [2022-11-20 10:58:56,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 240 states have (on average 1.2125) internal successors, (291), 266 states have internal predecessors, (291), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (18), 12 states have call predecessors, (18), 14 states have call successors, (18) [2022-11-20 10:58:56,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 323 transitions. [2022-11-20 10:58:56,163 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 323 transitions. Word has length 81 [2022-11-20 10:58:56,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 10:58:56,163 INFO L495 AbstractCegarLoop]: Abstraction has 288 states and 323 transitions. [2022-11-20 10:58:56,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 54 states have internal predecessors, (129), 8 states have call successors, (8), 4 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 10:58:56,164 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 323 transitions. [2022-11-20 10:58:56,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-20 10:58:56,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 10:58:56,165 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 10:58:56,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-20 10:58:56,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:58:56,375 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting appendErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 56 more)] === [2022-11-20 10:58:56,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 10:58:56,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1696190470, now seen corresponding path program 4 times [2022-11-20 10:58:56,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-20 10:58:56,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865491103] [2022-11-20 10:58:56,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 10:58:56,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 10:58:56,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:58:59,148 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-20 10:58:59,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:59:01,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-11-20 10:59:01,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:59:13,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-11-20 10:59:13,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 10:59:23,186 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 2 proven. 71 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 10:59:23,186 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-20 10:59:23,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865491103] [2022-11-20 10:59:23,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865491103] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 10:59:23,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106985173] [2022-11-20 10:59:23,186 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 10:59:23,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 10:59:23,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 [2022-11-20 10:59:23,187 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 10:59:23,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ff82a61-3f35-4d3f-98c4-e43fd5cbc6d4/bin/uautomizer-ug76WZFUDN/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-20 10:59:23,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 10:59:23,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 10:59:23,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 161 conjunts are in the unsatisfiable core [2022-11-20 10:59:23,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 10:59:23,860 INFO L350 Elim1Store]: Elim1 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 [2022-11-20 10:59:23,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:59:23,967 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-20 10:59:24,833 INFO L350 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 17 [2022-11-20 10:59:25,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:25,420 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-20 10:59:25,421 INFO L350 Elim1Store]: Elim1 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 2 case distinctions, treesize of input 22 treesize of output 31 [2022-11-20 10:59:25,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:59:25,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:25,462 INFO L321 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2022-11-20 10:59:25,462 INFO L350 Elim1Store]: Elim1 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 2 case distinctions, treesize of input 22 treesize of output 31 [2022-11-20 10:59:25,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:59:25,495 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-20 10:59:25,496 INFO L350 Elim1Store]: Elim1 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 17 treesize of output 21 [2022-11-20 10:59:25,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-20 10:59:27,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:27,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:27,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:27,943 INFO L321 Elim1Store]: treesize reduction 308, result has 29.5 percent of original size [2022-11-20 10:59:27,943 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 4 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 7 new quantified variables, introduced 19 case distinctions, treesize of input 191 treesize of output 465 [2022-11-20 10:59:28,253 INFO L321 Elim1Store]: treesize reduction 75, result has 29.2 percent of original size [2022-11-20 10:59:28,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 50 treesize of output 71 [2022-11-20 10:59:28,655 INFO L321 Elim1Store]: treesize reduction 118, result has 36.2 percent of original size [2022-11-20 10:59:28,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 60 treesize of output 137 [2022-11-20 10:59:28,897 INFO L350 Elim1Store]: Elim1 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 10 treesize of output 9 [2022-11-20 10:59:29,038 INFO L350 Elim1Store]: Elim1 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 10 treesize of output 9 [2022-11-20 10:59:29,490 INFO L321 Elim1Store]: treesize reduction 14, result has 61.1 percent of original size [2022-11-20 10:59:29,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 60 treesize of output 69 [2022-11-20 10:59:29,910 INFO L321 Elim1Store]: treesize reduction 13, result has 38.1 percent of original size [2022-11-20 10:59:29,911 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 46 [2022-11-20 10:59:30,131 INFO L321 Elim1Store]: treesize reduction 27, result has 3.6 percent of original size [2022-11-20 10:59:30,132 INFO L350 Elim1Store]: Elim1 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 1 [2022-11-20 10:59:30,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:30,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 1 [2022-11-20 10:59:30,898 INFO L321 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2022-11-20 10:59:30,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 106 treesize of output 98 [2022-11-20 10:59:31,308 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:59:31,351 INFO L321 Elim1Store]: treesize reduction 25, result has 24.2 percent of original size [2022-11-20 10:59:31,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 229 [2022-11-20 10:59:32,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:32,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:32,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-20 10:59:32,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 47 [2022-11-20 10:59:32,542 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 10:59:33,078 INFO L321 Elim1Store]: treesize reduction 310, result has 20.1 percent of original size [2022-11-20 10:59:33,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 3 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 1769 treesize of output 1501 [2022-11-20 10:59:59,998 INFO L321 Elim1Store]: treesize reduction 19, result has 34.5 percent of original size [2022-11-20 10:59:59,998 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 42 treesize of output 23 [2022-11-20 11:00:00,719 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 11:00:00,720 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 11:00:00,721 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 29 treesize of output 3 [2022-11-20 11:00:01,173 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 11:00:01,174 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-20 11:00:01,175 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 29 treesize of output 3 [2022-11-20 11:00:02,836 INFO L321 Elim1Store]: treesize reduction 19, result has 34.5 percent of original size [2022-11-20 11:00:02,836 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 48 treesize of output 25 [2022-11-20 11:00:07,494 INFO L321 Elim1Store]: treesize reduction 19, result has 34.5 percent of original size [2022-11-20 11:00:07,495 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 42 treesize of output 23 [2022-11-20 11:00:10,643 INFO L321 Elim1Store]: treesize reduction 19, result has 34.5 percent of original size [2022-11-20 11:00:10,644 INFO L350 Elim1Store]: Elim1 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 3 case distinctions, treesize of input 42 treesize of output 23