/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 22:04:13,976 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 22:04:13,980 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 22:04:14,040 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 22:04:14,041 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 22:04:14,045 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 22:04:14,050 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 22:04:14,059 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 22:04:14,063 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 22:04:14,069 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 22:04:14,071 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 22:04:14,072 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 22:04:14,073 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 22:04:14,077 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 22:04:14,079 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 22:04:14,081 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 22:04:14,083 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 22:04:14,086 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 22:04:14,094 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 22:04:14,102 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 22:04:14,104 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 22:04:14,106 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 22:04:14,108 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 22:04:14,112 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 22:04:14,121 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-23 22:04:14,122 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-23 22:04:14,122 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-23 22:04:14,140 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-23 22:04:14,141 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-23 22:04:14,143 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-23 22:04:14,144 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-23 22:04:14,145 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-23 22:04:14,147 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-23 22:04:14,148 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-23 22:04:14,149 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-23 22:04:14,150 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-23 22:04:14,151 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-23 22:04:14,151 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-23 22:04:14,151 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 22:04:14,152 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 22:04:14,153 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 22:04:14,154 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 22:04:14,177 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 22:04:14,178 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 22:04:14,182 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 22:04:14,183 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 22:04:14,183 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 22:04:14,183 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 22:04:14,183 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 22:04:14,184 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 22:04:14,184 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 22:04:14,184 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 22:04:14,185 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 22:04:14,186 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 22:04:14,186 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 22:04:14,186 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 22:04:14,187 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 22:04:14,187 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 22:04:14,187 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 22:04:14,187 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 22:04:14,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 22:04:14,188 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 22:04:14,188 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 22:04:14,188 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 22:04:14,188 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 22:04:14,647 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 22:04:14,682 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 22:04:14,686 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 22:04:14,688 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 22:04:14,689 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 22:04:14,690 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-10-23 22:04:14,774 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c76678ee/b3862b870e2d4aadb2dee09496bfbcc4/FLAG5a824cad5 [2020-10-23 22:04:15,380 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 22:04:15,381 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-10-23 22:04:15,390 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c76678ee/b3862b870e2d4aadb2dee09496bfbcc4/FLAG5a824cad5 [2020-10-23 22:04:15,723 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c76678ee/b3862b870e2d4aadb2dee09496bfbcc4 [2020-10-23 22:04:15,726 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 22:04:15,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 22:04:15,741 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 22:04:15,742 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 22:04:15,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 22:04:15,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:04:15" (1/1) ... [2020-10-23 22:04:15,751 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74627431 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:15, skipping insertion in model container [2020-10-23 22:04:15,751 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:04:15" (1/1) ... [2020-10-23 22:04:15,761 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 22:04:15,791 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 22:04:16,017 WARN L1500 CHandler]: Possible shadowing of function min [2020-10-23 22:04:16,061 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:04:16,093 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 22:04:16,153 WARN L1500 CHandler]: Possible shadowing of function min [2020-10-23 22:04:16,166 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 22:04:16,195 INFO L208 MainTranslator]: Completed translation [2020-10-23 22:04:16,196 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16 WrapperNode [2020-10-23 22:04:16,196 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 22:04:16,197 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 22:04:16,198 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 22:04:16,198 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 22:04:16,216 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,230 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,250 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,256 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,262 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... [2020-10-23 22:04:16,277 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 22:04:16,278 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 22:04:16,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 22:04:16,278 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 22:04:16,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 22:04:16,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 22:04:16,378 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 22:04:16,378 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-10-23 22:04:16,378 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 22:04:16,378 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 22:04:16,379 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-10-23 22:04:16,379 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-10-23 22:04:16,380 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-10-23 22:04:16,380 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-10-23 22:04:16,380 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-10-23 22:04:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-10-23 22:04:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 22:04:16,381 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-10-23 22:04:16,381 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-10-23 22:04:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-10-23 22:04:16,382 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-10-23 22:04:16,383 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 22:04:16,383 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-10-23 22:04:16,384 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-10-23 22:04:16,384 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 22:04:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 22:04:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 22:04:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 22:04:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 22:04:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-10-23 22:04:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-23 22:04:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 22:04:16,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-23 22:04:16,387 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-10-23 22:04:16,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 22:04:16,387 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-10-23 22:04:16,388 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 22:04:16,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 22:04:16,389 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 22:04:16,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 22:04:17,222 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 22:04:17,222 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-23 22:04:17,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:04:17 BoogieIcfgContainer [2020-10-23 22:04:17,225 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 22:04:17,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 22:04:17,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 22:04:17,233 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 22:04:17,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:04:15" (1/3) ... [2020-10-23 22:04:17,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62c8b5a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:04:17, skipping insertion in model container [2020-10-23 22:04:17,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:04:16" (2/3) ... [2020-10-23 22:04:17,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62c8b5a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:04:17, skipping insertion in model container [2020-10-23 22:04:17,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:04:17" (3/3) ... [2020-10-23 22:04:17,237 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2020-10-23 22:04:17,257 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 22:04:17,269 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 22:04:17,304 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 22:04:17,342 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 22:04:17,342 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 22:04:17,353 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 22:04:17,354 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 22:04:17,354 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 22:04:17,354 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 22:04:17,354 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 22:04:17,354 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 22:04:17,378 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2020-10-23 22:04:17,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-10-23 22:04:17,395 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:04:17,397 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:04:17,397 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:04:17,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:04:17,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1791888388, now seen corresponding path program 1 times [2020-10-23 22:04:17,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:04:17,415 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702423133] [2020-10-23 22:04:17,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:17,501 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:04:17,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:17,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:04:17,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:17,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-23 22:04:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-10-23 22:04:18,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2020-10-23 22:04:18,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-10-23 22:04:18,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-10-23 22:04:18,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2020-10-23 22:04:18,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:18,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 22:04:18,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702423133] [2020-10-23 22:04:18,244 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:04:18,244 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-10-23 22:04:18,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729141940] [2020-10-23 22:04:18,253 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-23 22:04:18,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:04:18,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-23 22:04:18,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-10-23 22:04:18,277 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 11 states. [2020-10-23 22:04:19,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:04:19,907 INFO L93 Difference]: Finished difference Result 376 states and 438 transitions. [2020-10-23 22:04:19,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-23 22:04:19,909 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 66 [2020-10-23 22:04:19,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:04:19,925 INFO L225 Difference]: With dead ends: 376 [2020-10-23 22:04:19,926 INFO L226 Difference]: Without dead ends: 216 [2020-10-23 22:04:19,932 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2020-10-23 22:04:19,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-10-23 22:04:20,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 202. [2020-10-23 22:04:20,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2020-10-23 22:04:20,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 226 transitions. [2020-10-23 22:04:20,033 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 226 transitions. Word has length 66 [2020-10-23 22:04:20,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:04:20,034 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 226 transitions. [2020-10-23 22:04:20,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-23 22:04:20,034 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 226 transitions. [2020-10-23 22:04:20,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-10-23 22:04:20,040 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:04:20,040 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:04:20,041 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 22:04:20,041 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:04:20,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:04:20,042 INFO L82 PathProgramCache]: Analyzing trace with hash 753948554, now seen corresponding path program 1 times [2020-10-23 22:04:20,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:04:20,043 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375836240] [2020-10-23 22:04:20,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:20,051 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:04:20,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:04:20,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-23 22:04:20,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-10-23 22:04:20,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2020-10-23 22:04:20,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 22:04:20,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-10-23 22:04:20,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2020-10-23 22:04:20,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2020-10-23 22:04:20,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2020-10-23 22:04:20,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:20,390 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 22:04:20,390 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375836240] [2020-10-23 22:04:20,391 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:04:20,391 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-10-23 22:04:20,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885760267] [2020-10-23 22:04:20,392 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 22:04:20,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:04:20,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 22:04:20,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-10-23 22:04:20,394 INFO L87 Difference]: Start difference. First operand 202 states and 226 transitions. Second operand 12 states. [2020-10-23 22:04:21,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:04:21,963 INFO L93 Difference]: Finished difference Result 361 states and 407 transitions. [2020-10-23 22:04:21,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-23 22:04:21,963 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 86 [2020-10-23 22:04:21,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:04:21,972 INFO L225 Difference]: With dead ends: 361 [2020-10-23 22:04:21,974 INFO L226 Difference]: Without dead ends: 215 [2020-10-23 22:04:21,982 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2020-10-23 22:04:21,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-10-23 22:04:22,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 204. [2020-10-23 22:04:22,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-10-23 22:04:22,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 229 transitions. [2020-10-23 22:04:22,095 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 229 transitions. Word has length 86 [2020-10-23 22:04:22,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:04:22,096 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 229 transitions. [2020-10-23 22:04:22,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 22:04:22,096 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 229 transitions. [2020-10-23 22:04:22,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-10-23 22:04:22,107 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:04:22,110 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:04:22,111 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 22:04:22,111 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:04:22,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:04:22,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1318257437, now seen corresponding path program 1 times [2020-10-23 22:04:22,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:04:22,112 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587996690] [2020-10-23 22:04:22,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:22,117 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:04:22,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:04:22,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-23 22:04:22,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-23 22:04:22,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-10-23 22:04:22,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-10-23 22:04:22,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-10-23 22:04:22,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 22:04:22,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-10-23 22:04:22,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80 [2020-10-23 22:04:22,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86 [2020-10-23 22:04:22,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2020-10-23 22:04:22,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:22,472 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-23 22:04:22,472 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587996690] [2020-10-23 22:04:22,473 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:04:22,473 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2020-10-23 22:04:22,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262537317] [2020-10-23 22:04:22,474 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-23 22:04:22,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:04:22,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-23 22:04:22,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2020-10-23 22:04:22,475 INFO L87 Difference]: Start difference. First operand 204 states and 229 transitions. Second operand 14 states. [2020-10-23 22:04:24,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:04:24,106 INFO L93 Difference]: Finished difference Result 360 states and 406 transitions. [2020-10-23 22:04:24,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-23 22:04:24,106 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 107 [2020-10-23 22:04:24,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:04:24,110 INFO L225 Difference]: With dead ends: 360 [2020-10-23 22:04:24,110 INFO L226 Difference]: Without dead ends: 217 [2020-10-23 22:04:24,112 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2020-10-23 22:04:24,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-10-23 22:04:24,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 206. [2020-10-23 22:04:24,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-10-23 22:04:24,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 232 transitions. [2020-10-23 22:04:24,154 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 232 transitions. Word has length 107 [2020-10-23 22:04:24,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:04:24,155 INFO L481 AbstractCegarLoop]: Abstraction has 206 states and 232 transitions. [2020-10-23 22:04:24,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-23 22:04:24,155 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 232 transitions. [2020-10-23 22:04:24,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-10-23 22:04:24,157 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:04:24,158 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:04:24,158 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 22:04:24,158 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:04:24,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:04:24,159 INFO L82 PathProgramCache]: Analyzing trace with hash 782152357, now seen corresponding path program 1 times [2020-10-23 22:04:24,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:04:24,159 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219282793] [2020-10-23 22:04:24,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:24,164 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:04:24,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 22:04:24,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-10-23 22:04:24,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-23 22:04:24,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-10-23 22:04:24,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-10-23 22:04:24,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 22:04:24,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-10-23 22:04:24,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-10-23 22:04:24,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-23 22:04:24,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-10-23 22:04:24,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2020-10-23 22:04:24,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 112 [2020-10-23 22:04:24,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2020-10-23 22:04:24,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 22:04:24,678 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-10-23 22:04:24,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219282793] [2020-10-23 22:04:24,688 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 22:04:24,688 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2020-10-23 22:04:24,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184111950] [2020-10-23 22:04:24,689 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-23 22:04:24,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 22:04:24,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-23 22:04:24,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2020-10-23 22:04:24,694 INFO L87 Difference]: Start difference. First operand 206 states and 232 transitions. Second operand 17 states. [2020-10-23 22:04:26,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 22:04:26,759 INFO L93 Difference]: Finished difference Result 343 states and 385 transitions. [2020-10-23 22:04:26,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-23 22:04:26,760 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 133 [2020-10-23 22:04:26,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 22:04:26,764 INFO L225 Difference]: With dead ends: 343 [2020-10-23 22:04:26,764 INFO L226 Difference]: Without dead ends: 217 [2020-10-23 22:04:26,766 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2020-10-23 22:04:26,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-10-23 22:04:26,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 208. [2020-10-23 22:04:26,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-10-23 22:04:26,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 236 transitions. [2020-10-23 22:04:26,824 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 236 transitions. Word has length 133 [2020-10-23 22:04:26,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 22:04:26,824 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 236 transitions. [2020-10-23 22:04:26,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-23 22:04:26,825 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 236 transitions. [2020-10-23 22:04:26,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-10-23 22:04:26,827 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 22:04:26,828 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 22:04:26,828 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-23 22:04:26,828 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 22:04:26,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 22:04:26,829 INFO L82 PathProgramCache]: Analyzing trace with hash 2078905262, now seen corresponding path program 1 times [2020-10-23 22:04:26,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 22:04:26,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894083289] [2020-10-23 22:04:26,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 22:04:26,837 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 22:04:26,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:04:26,882 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:04:26,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 22:04:26,943 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 22:04:27,031 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 22:04:27,031 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 22:04:27,034 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-23 22:04:27,071 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:04:27 BoogieIcfgContainer [2020-10-23 22:04:27,071 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 22:04:27,076 INFO L168 Benchmark]: Toolchain (without parser) took 11343.74 ms. Allocated memory was 151.0 MB in the beginning and 269.5 MB in the end (delta: 118.5 MB). Free memory was 126.7 MB in the beginning and 158.1 MB in the end (delta: -31.4 MB). Peak memory consumption was 87.3 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:27,077 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 151.0 MB. Free memory is still 126.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 22:04:27,079 INFO L168 Benchmark]: CACSL2BoogieTranslator took 455.43 ms. Allocated memory is still 151.0 MB. Free memory was 126.0 MB in the beginning and 114.4 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:27,086 INFO L168 Benchmark]: Boogie Preprocessor took 79.43 ms. Allocated memory is still 151.0 MB. Free memory was 114.4 MB in the beginning and 112.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:27,086 INFO L168 Benchmark]: RCFGBuilder took 947.31 ms. Allocated memory is still 151.0 MB. Free memory was 111.8 MB in the beginning and 101.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:27,087 INFO L168 Benchmark]: TraceAbstraction took 9843.72 ms. Allocated memory was 151.0 MB in the beginning and 269.5 MB in the end (delta: 118.5 MB). Free memory was 101.3 MB in the beginning and 158.1 MB in the end (delta: -56.9 MB). Peak memory consumption was 62.2 MB. Max. memory is 8.0 GB. [2020-10-23 22:04:27,090 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 151.0 MB. Free memory is still 126.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 455.43 ms. Allocated memory is still 151.0 MB. Free memory was 126.0 MB in the beginning and 114.4 MB in the end (delta: 11.7 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 79.43 ms. Allocated memory is still 151.0 MB. Free memory was 114.4 MB in the beginning and 112.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 947.31 ms. Allocated memory is still 151.0 MB. Free memory was 111.8 MB in the beginning and 101.8 MB in the end (delta: 10.1 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 9843.72 ms. Allocated memory was 151.0 MB in the beginning and 269.5 MB in the end (delta: 118.5 MB). Free memory was 101.3 MB in the beginning and 158.1 MB in the end (delta: -56.9 MB). Peak memory consumption was 62.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L110] CALL, EXPR nondet_tree() [L25] COND FALSE !(__VERIFIER_nondet_bool()) [L28] struct node *n = (struct node *)malloc(sizeof(struct node)); [L29] n->data = __VERIFIER_nondet_int() [L30] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; [L30] RET, EXPR nondet_tree() [L30] n->left = nondet_tree() [L31] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; [L31] RET, EXPR nondet_tree() [L31] n->right = nondet_tree() [L32] return n; [L110] RET, EXPR nondet_tree() [L110] CALL task(nondet_tree()) [L86] CALL, EXPR min(t) [L37] COND FALSE !(!n) [L40] EXPR n->data [L40] int a = n->data; [L41] EXPR n->left [L41] CALL, EXPR min(n->left) [L37] COND TRUE !n [L38] return 2147483647; [L41] RET, EXPR min(n->left) [L41] int b = min(n->left); [L42] EXPR n->right [L42] CALL, EXPR min(n->right) [L37] COND TRUE !n [L38] return 2147483647; [L42] RET, EXPR min(n->right) [L42] int c = min(n->right); [L43] COND TRUE b <= a && b <= c [L43] return b; [L86] RET, EXPR min(t) [L86] int a = min(t); [L87] int b; [L89] CALL, EXPR size(t) [L81] COND FALSE !(!t) [L82] EXPR t->left [L82] CALL, EXPR size(t->left) [L81] COND TRUE !t [L81] return 0; [L82] RET, EXPR size(t->left) [L82] EXPR t->right [L82] CALL, EXPR size(t->right) [L81] COND TRUE !t [L81] return 0; [L82] RET, EXPR size(t->right) [L82] return size(t->left) + size(t->right) + 1; [L89] RET, EXPR size(t) [L89] int n = size(t); [L90] CALL assume_cycle_if_not(n != 0) [L9] COND FALSE !(!cond) [L90] RET assume_cycle_if_not(n != 0) [L91] EXPR, FCALL calloc(n, sizeof(int)) [L91] int *x = calloc(n, sizeof(int)); [L92] CALL tree_inorder(t, x, n) [L70] COND FALSE !(!t) [L73] EXPR t->left [L73] CALL, EXPR tree_inorder(t->left, a, i) [L70] COND TRUE !t [L71] return i; [L73] RET, EXPR tree_inorder(t->left, a, i) [L73] i = tree_inorder(t->left, a, i) [L74] EXPR i++ [L74] EXPR t->data [L74] a[i++] = t->data [L75] EXPR t->right [L75] CALL, EXPR tree_inorder(t->right, a, i) [L70] COND TRUE !t [L71] return i; [L75] RET, EXPR tree_inorder(t->right, a, i) [L75] i = tree_inorder(t->right, a, i) [L76] return i; [L92] RET tree_inorder(t, x, n) [L93] EXPR x[0] [L93] CALL __VERIFIER_assert(a == x[0]) [L16] COND TRUE !cond [L16] CALL reach_error() [L14] __assert_fail("0", "tree_del_iter.c", 14, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 13 procedures, 215 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.7s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 6.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 741 SDtfs, 1336 SDslu, 2383 SDs, 0 SdLazy, 5192 SolverSat, 451 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 163 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=215occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 4 MinimizatonAttempts, 45 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...