/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-a47f07a [2021-04-16 07:54:22,011 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-04-16 07:54:22,014 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-04-16 07:54:22,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-04-16 07:54:22,076 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-04-16 07:54:22,078 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-04-16 07:54:22,079 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-04-16 07:54:22,081 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-04-16 07:54:22,083 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-04-16 07:54:22,084 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-04-16 07:54:22,087 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-04-16 07:54:22,094 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-04-16 07:54:22,095 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-04-16 07:54:22,099 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-04-16 07:54:22,100 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-04-16 07:54:22,102 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-04-16 07:54:22,108 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-04-16 07:54:22,112 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-04-16 07:54:22,113 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-04-16 07:54:22,127 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-04-16 07:54:22,128 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-04-16 07:54:22,129 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-04-16 07:54:22,129 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-04-16 07:54:22,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-04-16 07:54:22,130 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-04-16 07:54:22,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-04-16 07:54:22,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-04-16 07:54:22,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-04-16 07:54:22,134 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-04-16 07:54:22,146 INFO L113 SettingsManager]: Loading preferences was successful [2021-04-16 07:54:22,146 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-04-16 07:54:22,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-04-16 07:54:22,149 INFO L138 SettingsManager]: * sizeof long=4 [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-04-16 07:54:22,150 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-04-16 07:54:22,151 INFO L138 SettingsManager]: * sizeof long double=12 [2021-04-16 07:54:22,151 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-04-16 07:54:22,151 INFO L138 SettingsManager]: * Use constant arrays=true [2021-04-16 07:54:22,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-04-16 07:54:22,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-04-16 07:54:22,152 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-04-16 07:54:22,152 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-04-16 07:54:22,152 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-04-16 07:54:22,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-04-16 07:54:22,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-04-16 07:54:22,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-04-16 07:54:22,153 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-04-16 07:54:22,153 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-04-16 07:54:22,153 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-04-16 07:54:22,503 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-04-16 07:54:22,531 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-04-16 07:54:22,534 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-04-16 07:54:22,535 INFO L271 PluginConnector]: Initializing CDTParser... [2021-04-16 07:54:22,538 INFO L275 PluginConnector]: CDTParser initialized [2021-04-16 07:54:22,539 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-04-16 07:54:22,620 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97cfd2380/ca2b26e8c2234cec8723bbe4103b8c9c/FLAG021042db1 [2021-04-16 07:54:22,992 INFO L306 CDTParser]: Found 1 translation units. [2021-04-16 07:54:23,000 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c [2021-04-16 07:54:23,006 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97cfd2380/ca2b26e8c2234cec8723bbe4103b8c9c/FLAG021042db1 [2021-04-16 07:54:23,416 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97cfd2380/ca2b26e8c2234cec8723bbe4103b8c9c [2021-04-16 07:54:23,418 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-04-16 07:54:23,419 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-04-16 07:54:23,422 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-04-16 07:54:23,422 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-04-16 07:54:23,425 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-04-16 07:54:23,425 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,426 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fc600cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23, skipping insertion in model container [2021-04-16 07:54:23,426 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,432 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-04-16 07:54:23,457 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-04-16 07:54:23,550 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2021-04-16 07:54:23,562 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-16 07:54:23,568 INFO L203 MainTranslator]: Completed pre-run [2021-04-16 07:54:23,577 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2021-04-16 07:54:23,582 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-16 07:54:23,593 INFO L208 MainTranslator]: Completed translation [2021-04-16 07:54:23,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23 WrapperNode [2021-04-16 07:54:23,594 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-04-16 07:54:23,594 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-04-16 07:54:23,595 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-04-16 07:54:23,595 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-04-16 07:54:23,635 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,642 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,661 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,664 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,666 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (1/1) ... [2021-04-16 07:54:23,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-04-16 07:54:23,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-04-16 07:54:23,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-04-16 07:54:23,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-04-16 07:54:23,669 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (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 [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2021-04-16 07:54:23,735 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2021-04-16 07:54:23,736 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-04-16 07:54:23,736 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-04-16 07:54:23,736 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-04-16 07:54:23,736 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-04-16 07:54:23,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-04-16 07:54:23,738 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-04-16 07:54:23,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-04-16 07:54:23,739 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-04-16 07:54:23,740 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-04-16 07:54:23,740 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-04-16 07:54:24,043 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-04-16 07:54:24,043 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-04-16 07:54:24,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.04 07:54:24 BoogieIcfgContainer [2021-04-16 07:54:24,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-04-16 07:54:24,048 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-04-16 07:54:24,049 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-04-16 07:54:24,051 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-04-16 07:54:24,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.04 07:54:23" (1/3) ... [2021-04-16 07:54:24,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fdb5e47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.04 07:54:24, skipping insertion in model container [2021-04-16 07:54:24,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.04 07:54:23" (2/3) ... [2021-04-16 07:54:24,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4fdb5e47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.04 07:54:24, skipping insertion in model container [2021-04-16 07:54:24,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.04 07:54:24" (3/3) ... [2021-04-16 07:54:24,054 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2021-04-16 07:54:24,058 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-04-16 07:54:24,061 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-04-16 07:54:24,075 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-04-16 07:54:24,091 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-16 07:54:24,092 INFO L377 AbstractCegarLoop]: Hoare is true [2021-04-16 07:54:24,092 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-04-16 07:54:24,092 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-16 07:54:24,092 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-16 07:54:24,092 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-16 07:54:24,092 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-16 07:54:24,092 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-16 07:54:24,105 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-04-16 07:54:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-04-16 07:54:24,115 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:24,116 INFO L519 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] [2021-04-16 07:54:24,116 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:24,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:24,122 INFO L82 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 1 times [2021-04-16 07:54:24,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:24,128 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101083396] [2021-04-16 07:54:24,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:24,185 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-04-16 07:54:24,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:24,374 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,377 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:24,379 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,380 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,392 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,393 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,404 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,406 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,424 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,425 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,445 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,446 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-16 07:54:24,457 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,458 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-16 07:54:24,466 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,466 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:24,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:24,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:24,506 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,507 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:24,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:24,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:24,521 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,522 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:24,523 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,523 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,531 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,532 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-04-16 07:54:24,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:24,548 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,549 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:24,549 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,550 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,578 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:24,578 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:24,596 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:24,597 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101083396] [2021-04-16 07:54:24,599 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:24,599 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-04-16 07:54:24,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680589533] [2021-04-16 07:54:24,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-04-16 07:54:24,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:24,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-04-16 07:54:24,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-04-16 07:54:24,620 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:25,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:25,487 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2021-04-16 07:54:25,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-04-16 07:54:25,489 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-04-16 07:54:25,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:25,496 INFO L225 Difference]: With dead ends: 91 [2021-04-16 07:54:25,496 INFO L226 Difference]: Without dead ends: 42 [2021-04-16 07:54:25,498 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 529.1ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-04-16 07:54:25,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-04-16 07:54:25,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-04-16 07:54:25,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 6 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) [2021-04-16 07:54:25,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-04-16 07:54:25,534 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 25 [2021-04-16 07:54:25,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:25,535 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-04-16 07:54:25,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:25,535 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-04-16 07:54:25,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-04-16 07:54:25,537 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:25,537 INFO L519 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] [2021-04-16 07:54:25,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-04-16 07:54:25,537 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:25,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:25,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 1 times [2021-04-16 07:54:25,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:25,538 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024520697] [2021-04-16 07:54:25,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:25,541 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-04-16 07:54:25,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,577 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,578 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,579 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,579 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:25,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,623 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,624 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:25,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,633 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,633 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-04-16 07:54:25,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,642 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,642 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,643 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,643 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:54:25,647 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,647 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:25,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024520697] [2021-04-16 07:54:25,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:25,648 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-04-16 07:54:25,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553714586] [2021-04-16 07:54:25,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-04-16 07:54:25,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:25,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-04-16 07:54:25,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-04-16 07:54:25,658 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-04-16 07:54:25,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:25,773 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2021-04-16 07:54:25,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-04-16 07:54:25,774 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2021-04-16 07:54:25,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:25,776 INFO L225 Difference]: With dead ends: 55 [2021-04-16 07:54:25,776 INFO L226 Difference]: Without dead ends: 42 [2021-04-16 07:54:25,777 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-04-16 07:54:25,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-04-16 07:54:25,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-04-16 07:54:25,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 6 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) [2021-04-16 07:54:25,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-04-16 07:54:25,802 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 27 [2021-04-16 07:54:25,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:25,803 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-04-16 07:54:25,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-04-16 07:54:25,803 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-04-16 07:54:25,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-04-16 07:54:25,804 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:25,804 INFO L519 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] [2021-04-16 07:54:25,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-04-16 07:54:25,804 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:25,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:25,804 INFO L82 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 1 times [2021-04-16 07:54:25,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:25,805 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231926974] [2021-04-16 07:54:25,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:25,807 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-04-16 07:54:25,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,825 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,826 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,826 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,826 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:25,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,865 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,866 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:25,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,876 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,877 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,878 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,879 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:54:25,884 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,884 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-04-16 07:54:25,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:25,890 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:25,890 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:25,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:25,891 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231926974] [2021-04-16 07:54:25,891 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:25,892 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-04-16 07:54:25,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340817165] [2021-04-16 07:54:25,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-04-16 07:54:25,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:25,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-04-16 07:54:25,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-04-16 07:54:25,894 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:25,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:25,987 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2021-04-16 07:54:25,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-04-16 07:54:25,988 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-04-16 07:54:25,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:25,989 INFO L225 Difference]: With dead ends: 72 [2021-04-16 07:54:25,989 INFO L226 Difference]: Without dead ends: 43 [2021-04-16 07:54:25,989 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-04-16 07:54:25,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-04-16 07:54:25,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-04-16 07:54:25,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 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) [2021-04-16 07:54:25,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-04-16 07:54:25,997 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 27 [2021-04-16 07:54:25,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:25,997 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-04-16 07:54:25,998 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:25,998 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-04-16 07:54:25,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-04-16 07:54:25,998 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:25,998 INFO L519 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] [2021-04-16 07:54:25,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-04-16 07:54:25,999 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:25,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:25,999 INFO L82 PathProgramCache]: Analyzing trace with hash 743790053, now seen corresponding path program 1 times [2021-04-16 07:54:25,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:25,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500146192] [2021-04-16 07:54:25,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:26,021 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,030 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,030 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_student_version_~i~1_10 v_student_version_~w_8) InVars {student_version_~i~1=v_student_version_~i~1_10, student_version_~w=v_student_version_~w_8} OutVars{student_version_~i~1=v_student_version_~i~1_10, student_version_~w=v_student_version_~w_8} AuxVars[] AssignedVars[] [2021-04-16 07:54:26,040 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size [2021-04-16 07:54:26,046 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,049 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,052 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,065 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:54:26,067 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:26,073 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,075 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,077 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,079 INFO L108 tifierPushTermWalker]: treesize reduction 8, result has 11.1 percent of original size [2021-04-16 07:54:26,082 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,084 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size 50 [2021-04-16 07:54:26,099 INFO L142 QuantifierPusher]: treesize reduction 7, result has 86.8 percent of original size [2021-04-16 07:54:26,100 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-04-16 07:54:26,101 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:54:26,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,130 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,131 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,135 INFO L142 QuantifierPusher]: treesize reduction 11, result has 72.5 percent of original size [2021-04-16 07:54:26,136 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-04-16 07:54:26,150 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,153 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:26,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,182 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,183 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:26,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,210 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,210 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,215 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,215 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-04-16 07:54:26,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,259 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,260 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,266 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,267 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-16 07:54:26,276 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,276 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:26,288 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:26,342 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,343 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 78 [2021-04-16 07:54:26,344 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,346 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,347 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-16 07:54:26,359 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,363 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-04-16 07:54:26,376 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,377 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,379 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,380 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-04-16 07:54:26,392 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:26,397 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,397 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:26,399 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-04-16 07:54:26,419 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:26,421 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,422 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:26,423 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-04-16 07:54:26,443 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:26,448 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,450 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:26,459 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:54:26,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500146192] [2021-04-16 07:54:26,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:26,484 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-04-16 07:54:26,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068174053] [2021-04-16 07:54:26,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-04-16 07:54:26,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:26,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-04-16 07:54:26,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-04-16 07:54:26,490 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:26,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:26,807 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-04-16 07:54:26,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-04-16 07:54:26,808 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-04-16 07:54:26,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:26,809 INFO L225 Difference]: With dead ends: 56 [2021-04-16 07:54:26,809 INFO L226 Difference]: Without dead ends: 45 [2021-04-16 07:54:26,810 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 289.8ms TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-04-16 07:54:26,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-04-16 07:54:26,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2021-04-16 07:54:26,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 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) [2021-04-16 07:54:26,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-04-16 07:54:26,825 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 29 [2021-04-16 07:54:26,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:26,826 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-04-16 07:54:26,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:26,827 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-04-16 07:54:26,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-04-16 07:54:26,828 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:26,828 INFO L519 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] [2021-04-16 07:54:26,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-04-16 07:54:26,828 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:26,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:26,829 INFO L82 PathProgramCache]: Analyzing trace with hash 198429957, now seen corresponding path program 1 times [2021-04-16 07:54:26,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:26,830 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793557862] [2021-04-16 07:54:26,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:26,834 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,835 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:26,835 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_10 v_correct_version_~w_8) InVars {correct_version_~i~0=v_correct_version_~i~0_10, correct_version_~w=v_correct_version_~w_8} OutVars{correct_version_~i~0=v_correct_version_~i~0_10, correct_version_~w=v_correct_version_~w_8} AuxVars[] AssignedVars[] [2021-04-16 07:54:26,843 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size [2021-04-16 07:54:26,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,854 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,858 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:54:26,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:26,863 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,865 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,870 INFO L108 tifierPushTermWalker]: treesize reduction 8, result has 11.1 percent of original size [2021-04-16 07:54:26,873 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,876 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,879 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,881 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,883 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,884 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size 50 [2021-04-16 07:54:26,896 INFO L142 QuantifierPusher]: treesize reduction 7, result has 86.8 percent of original size [2021-04-16 07:54:26,898 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-04-16 07:54:26,899 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:54:26,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,943 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,943 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,946 INFO L142 QuantifierPusher]: treesize reduction 11, result has 72.5 percent of original size [2021-04-16 07:54:26,947 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-04-16 07:54:26,958 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,958 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:26,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:26,990 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:26,990 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:26,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:26,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,000 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,000 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,005 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,005 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-16 07:54:27,012 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,012 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-04-16 07:54:27,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,024 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,024 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,030 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,032 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:27,046 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,083 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,088 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 72 [2021-04-16 07:54:27,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,090 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,090 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 18 [2021-04-16 07:54:27,091 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,092 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,093 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-16 07:54:27,101 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,103 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-04-16 07:54:27,113 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,116 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,117 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,119 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-04-16 07:54:27,129 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,131 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,131 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:27,132 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 22 [2021-04-16 07:54:27,148 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,149 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,150 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:27,150 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-04-16 07:54:27,169 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,172 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,174 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:27,176 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 28 [2021-04-16 07:54:27,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793557862] [2021-04-16 07:54:27,197 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:27,197 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-04-16 07:54:27,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099348800] [2021-04-16 07:54:27,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-04-16 07:54:27,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:27,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-04-16 07:54:27,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-04-16 07:54:27,201 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:27,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:27,466 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-04-16 07:54:27,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-04-16 07:54:27,467 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-04-16 07:54:27,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:27,468 INFO L225 Difference]: With dead ends: 51 [2021-04-16 07:54:27,468 INFO L226 Difference]: Without dead ends: 42 [2021-04-16 07:54:27,468 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 274.5ms TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-04-16 07:54:27,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-04-16 07:54:27,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-04-16 07:54:27,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 6 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) [2021-04-16 07:54:27,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-04-16 07:54:27,478 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 29 [2021-04-16 07:54:27,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:27,478 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-04-16 07:54:27,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-04-16 07:54:27,478 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-04-16 07:54:27,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-04-16 07:54:27,485 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:27,486 INFO L519 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] [2021-04-16 07:54:27,486 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-04-16 07:54:27,486 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:27,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:27,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1589989783, now seen corresponding path program 1 times [2021-04-16 07:54:27,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:27,486 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042985550] [2021-04-16 07:54:27,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:27,491 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,493 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,494 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_16 v_correct_version_~w_12) InVars {correct_version_~i~0=v_correct_version_~i~0_16, correct_version_~w=v_correct_version_~w_12} OutVars{correct_version_~i~0=v_correct_version_~i~0_16, correct_version_~w=v_correct_version_~w_12} AuxVars[] AssignedVars[] [2021-04-16 07:54:27,497 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size [2021-04-16 07:54:27,501 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,504 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,506 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,511 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:54:27,515 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:27,521 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:54:27,525 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,527 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,529 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,532 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,534 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size 50 [2021-04-16 07:54:27,548 INFO L142 QuantifierPusher]: treesize reduction 7, result has 88.1 percent of original size [2021-04-16 07:54:27,549 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-04-16 07:54:27,550 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:54:27,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,582 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,582 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,583 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,583 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-16 07:54:27,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,604 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,605 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-04-16 07:54:27,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,612 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,612 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-04-16 07:54:27,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-16 07:54:27,621 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,621 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,623 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,623 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:54:27,626 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,627 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:54:27,631 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,631 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-16 07:54:27,634 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-04-16 07:54:27,641 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,641 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-04-16 07:54:27,643 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,644 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,644 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,648 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,649 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-04-16 07:54:27,654 INFO L142 QuantifierPusher]: treesize reduction 9, result has 10.0 percent of original size [2021-04-16 07:54:27,655 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-16 07:54:27,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042985550] [2021-04-16 07:54:27,656 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-16 07:54:27,657 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-04-16 07:54:27,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161061445] [2021-04-16 07:54:27,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-04-16 07:54:27,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-04-16 07:54:27,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-04-16 07:54:27,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-04-16 07:54:27,658 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-04-16 07:54:27,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-16 07:54:27,825 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-04-16 07:54:27,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-04-16 07:54:27,826 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-04-16 07:54:27,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-16 07:54:27,829 INFO L225 Difference]: With dead ends: 58 [2021-04-16 07:54:27,829 INFO L226 Difference]: Without dead ends: 45 [2021-04-16 07:54:27,830 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 105.6ms TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-04-16 07:54:27,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-04-16 07:54:27,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-04-16 07:54:27,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 6 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) [2021-04-16 07:54:27,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-04-16 07:54:27,843 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2021-04-16 07:54:27,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-16 07:54:27,844 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-04-16 07:54:27,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-04-16 07:54:27,845 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-04-16 07:54:27,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-04-16 07:54:27,845 INFO L511 BasicCegarLoop]: Found error trace [2021-04-16 07:54:27,845 INFO L519 BasicCegarLoop]: 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, 1, 1, 1] [2021-04-16 07:54:27,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-04-16 07:54:27,846 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-16 07:54:27,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-16 07:54:27,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1518564121, now seen corresponding path program 2 times [2021-04-16 07:54:27,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-04-16 07:54:27,846 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802565666] [2021-04-16 07:54:27,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-16 07:54:27,849 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,850 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-16 07:54:27,851 INFO L175 rdanLoopAcceleration]: Guard: Formula: (< v_correct_version_~i~0_22 v_correct_version_~w_16) InVars {correct_version_~i~0=v_correct_version_~i~0_22, correct_version_~w=v_correct_version_~w_16} OutVars{correct_version_~i~0=v_correct_version_~i~0_22, correct_version_~w=v_correct_version_~w_16} AuxVars[] AssignedVars[] [2021-04-16 07:54:27,854 WARN L240 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size [2021-04-16 07:54:27,856 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,858 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,860 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,865 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,867 INFO L108 tifierPushTermWalker]: treesize reduction 2, result has 33.3 percent of original size [2021-04-16 07:54:27,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-04-16 07:54:27,872 INFO L108 tifierPushTermWalker]: treesize reduction 8, result has 11.1 percent of original size [2021-04-16 07:54:27,874 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,876 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,878 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,880 INFO L108 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-04-16 07:54:27,881 WARN L245 tifierPushTermWalker]: treesize reduction 10, result has 83.3 percent of original size 50 [2021-04-16 07:54:27,892 INFO L142 QuantifierPusher]: treesize reduction 7, result has 86.8 percent of original size [2021-04-16 07:54:27,893 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 46 [2021-04-16 07:54:27,894 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-04-16 07:54:27,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-16 07:54:27,922 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-16 07:54:27,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-16 07:54:27,952 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-16 07:54:27,979 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-04-16 07:54:27,979 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-04-16 07:54:27,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-04-16 07:54:27,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.04 07:54:27 BoogieIcfgContainer [2021-04-16 07:54:27,995 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-04-16 07:54:27,997 INFO L168 Benchmark]: Toolchain (without parser) took 4576.80 ms. Allocated memory was 179.3 MB in the beginning and 230.7 MB in the end (delta: 51.4 MB). Free memory was 145.6 MB in the beginning and 82.7 MB in the end (delta: 62.9 MB). Peak memory consumption was 115.0 MB. Max. memory is 8.0 GB. [2021-04-16 07:54:28,004 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 179.3 MB. Free memory was 162.2 MB in the beginning and 162.1 MB in the end (delta: 108.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-04-16 07:54:28,004 INFO L168 Benchmark]: CACSL2BoogieTranslator took 172.08 ms. Allocated memory is still 179.3 MB. Free memory was 145.4 MB in the beginning and 135.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-04-16 07:54:28,005 INFO L168 Benchmark]: Boogie Preprocessor took 72.58 ms. Allocated memory is still 179.3 MB. Free memory was 135.7 MB in the beginning and 162.7 MB in the end (delta: -27.1 MB). Peak memory consumption was 4.3 MB. Max. memory is 8.0 GB. [2021-04-16 07:54:28,007 INFO L168 Benchmark]: RCFGBuilder took 376.90 ms. Allocated memory is still 179.3 MB. Free memory was 162.7 MB in the beginning and 146.0 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-04-16 07:54:28,007 INFO L168 Benchmark]: TraceAbstraction took 3946.90 ms. Allocated memory was 179.3 MB in the beginning and 230.7 MB in the end (delta: 51.4 MB). Free memory was 145.7 MB in the beginning and 82.7 MB in the end (delta: 63.0 MB). Peak memory consumption was 114.9 MB. Max. memory is 8.0 GB. [2021-04-16 07:54:28,008 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 179.3 MB. Free memory was 162.2 MB in the beginning and 162.1 MB in the end (delta: 108.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 172.08 ms. Allocated memory is still 179.3 MB. Free memory was 145.4 MB in the beginning and 135.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 72.58 ms. Allocated memory is still 179.3 MB. Free memory was 135.7 MB in the beginning and 162.7 MB in the end (delta: -27.1 MB). Peak memory consumption was 4.3 MB. Max. memory is 8.0 GB. * RCFGBuilder took 376.90 ms. Allocated memory is still 179.3 MB. Free memory was 162.7 MB in the beginning and 146.0 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3946.90 ms. Allocated memory was 179.3 MB in the beginning and 230.7 MB in the end (delta: 51.4 MB). Free memory was 145.7 MB in the beginning and 82.7 MB in the end (delta: 63.0 MB). Peak memory consumption was 114.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int true = 1; [L13] int false = 0; [L55] unsigned int w=__VERIFIER_nondet_uint(); [L57] int is_divisible1 = true, is_divisible2 = true; [L59] COND TRUE w > 0 && w < 10000000 [L61] CALL, EXPR correct_version(w) [L17] int is_divisible = true; [L19] COND FALSE !(w < 4) [L23] int i; [L24] i = 0 [L24] COND TRUE i < w [L24] i += 2 [L24] COND FALSE !(i < w) [L27] COND TRUE i != w [L28] is_divisible = false [L31] return is_divisible; [L61] RET, EXPR correct_version(w) [L61] is_divisible1 = correct_version(w) [L62] CALL, EXPR student_version(w) [L36] int is_divisible = true; [L38] COND FALSE !(w < 4) [L42] int i; [L43] i = 0 [L43] COND TRUE i < w [L43] i += 2 [L43] COND TRUE i < w [L43] i += 2 [L43] COND FALSE !(i < w) [L46] COND FALSE !(i != w) [L50] return is_divisible; [L62] RET, EXPR student_version(w) [L62] is_divisible2 = student_version(w) [L63] CALL __VERIFIER_assert(is_divisible1 == is_divisible2) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3890.4ms, OverallIterations: 7, TraceHistogramMax: 2, EmptinessCheckTime: 25.9ms, AutomataDifference: 1871.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 140 SDtfs, 275 SDslu, 184 SDs, 0 SdLazy, 989 SolverSat, 68 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 660.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 134 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1286.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=6, InterpolantAutomatonStates: 48, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 95.9ms AutomataMinimizationTime, 6 MinimizatonAttempts, 8 StatesRemovedByMinimization, 5 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...