/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/nla-digbench/sqrt1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-24 02:40:37,507 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 02:40:37,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 02:40:37,559 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-24 02:40:37,560 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-24 02:40:37,562 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-24 02:40:37,564 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-24 02:40:37,567 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-24 02:40:37,570 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-24 02:40:37,571 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-24 02:40:37,573 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-24 02:40:37,575 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-24 02:40:37,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-24 02:40:37,577 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-24 02:40:37,578 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-24 02:40:37,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-24 02:40:37,583 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-24 02:40:37,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-24 02:40:37,591 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-24 02:40:37,596 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-24 02:40:37,601 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-24 02:40:37,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-24 02:40:37,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-24 02:40:37,611 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-24 02:40:37,620 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-24 02:40:37,645 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-24 02:40:37,646 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-24 02:40:37,647 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-24 02:40:37,648 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-24 02:40:37,680 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 02:40:37,680 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 02:40:37,685 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 02:40:37,685 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 02:40:37,685 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-24 02:40:37,686 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 02:40:37,686 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 02:40:37,686 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 02:40:37,686 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 02:40:37,687 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 02:40:37,688 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 02:40:37,688 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 02:40:37,689 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 02:40:37,689 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 02:40:37,689 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 02:40:37,690 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-24 02:40:37,690 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 02:40:37,690 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 02:40:37,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 02:40:37,691 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 02:40:37,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-24 02:40:37,691 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 02:40:37,692 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-10-24 02:40:38,131 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 02:40:38,193 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 02:40:38,196 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 02:40:38,198 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 02:40:38,199 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 02:40:38,200 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-10-24 02:40:38,302 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b4b4ffe1/c15626ef5e5e43f691b43b8448440454/FLAG13e818e88 [2020-10-24 02:40:39,008 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 02:40:39,008 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/sqrt1.c [2020-10-24 02:40:39,017 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b4b4ffe1/c15626ef5e5e43f691b43b8448440454/FLAG13e818e88 [2020-10-24 02:40:39,380 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b4b4ffe1/c15626ef5e5e43f691b43b8448440454 [2020-10-24 02:40:39,384 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 02:40:39,391 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-24 02:40:39,394 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 02:40:39,394 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 02:40:39,398 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 02:40:39,399 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,404 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c218121 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39, skipping insertion in model container [2020-10-24 02:40:39,404 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,413 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 02:40:39,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 02:40:39,676 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:40:39,687 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 02:40:39,709 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:40:39,728 INFO L208 MainTranslator]: Completed translation [2020-10-24 02:40:39,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39 WrapperNode [2020-10-24 02:40:39,729 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 02:40:39,733 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 02:40:39,734 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 02:40:39,734 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 02:40:39,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,767 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,768 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,790 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,796 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,800 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... [2020-10-24 02:40:39,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 02:40:39,814 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 02:40:39,814 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 02:40:39,814 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 02:40:39,817 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 02:40:39,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-24 02:40:39,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 02:40:39,917 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-24 02:40:39,917 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-24 02:40:39,918 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-24 02:40:39,918 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-24 02:40:39,918 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-24 02:40:39,918 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-24 02:40:39,918 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-24 02:40:39,918 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 02:40:39,919 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-24 02:40:39,919 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-24 02:40:39,919 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-24 02:40:39,919 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-24 02:40:39,919 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-24 02:40:39,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-24 02:40:39,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 02:40:39,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-24 02:40:39,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-24 02:40:39,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-24 02:40:40,323 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 02:40:40,324 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-24 02:40:40,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:40:40 BoogieIcfgContainer [2020-10-24 02:40:40,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 02:40:40,328 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 02:40:40,329 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 02:40:40,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 02:40:40,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 02:40:39" (1/3) ... [2020-10-24 02:40:40,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dbdbe88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:40:40, skipping insertion in model container [2020-10-24 02:40:40,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:40:39" (2/3) ... [2020-10-24 02:40:40,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dbdbe88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:40:40, skipping insertion in model container [2020-10-24 02:40:40,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:40:40" (3/3) ... [2020-10-24 02:40:40,337 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1.c [2020-10-24 02:40:40,349 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-24 02:40:40,354 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 02:40:40,381 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 02:40:40,408 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 02:40:40,408 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 02:40:40,408 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-24 02:40:40,408 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 02:40:40,409 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 02:40:40,409 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 02:40:40,409 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 02:40:40,409 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 02:40:40,428 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-10-24 02:40:40,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-24 02:40:40,440 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:40:40,441 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:40:40,442 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:40:40,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:40:40,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1636349943, now seen corresponding path program 1 times [2020-10-24 02:40:40,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:40:40,462 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524165184] [2020-10-24 02:40:40,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:40:40,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:40:40,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:40:40,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:40:40,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:40:40,754 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524165184] [2020-10-24 02:40:40,757 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 02:40:40,757 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-24 02:40:40,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062298505] [2020-10-24 02:40:40,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-24 02:40:40,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:40:40,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-24 02:40:40,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-24 02:40:40,798 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-10-24 02:40:41,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:40:41,075 INFO L93 Difference]: Finished difference Result 70 states and 93 transitions. [2020-10-24 02:40:41,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-24 02:40:41,079 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-10-24 02:40:41,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:40:41,097 INFO L225 Difference]: With dead ends: 70 [2020-10-24 02:40:41,097 INFO L226 Difference]: Without dead ends: 40 [2020-10-24 02:40:41,108 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-24 02:40:41,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-24 02:40:41,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-10-24 02:40:41,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-24 02:40:41,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-10-24 02:40:41,212 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 28 [2020-10-24 02:40:41,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:40:41,214 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-10-24 02:40:41,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-24 02:40:41,214 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-10-24 02:40:41,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-24 02:40:41,216 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:40:41,216 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:40:41,217 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-24 02:40:41,217 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:40:41,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:40:41,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1258629854, now seen corresponding path program 1 times [2020-10-24 02:40:41,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:40:41,220 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1509935951] [2020-10-24 02:40:41,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:40:41,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:40:41,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:40:41,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:40:41,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:40:41,476 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1509935951] [2020-10-24 02:40:41,476 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 02:40:41,477 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-24 02:40:41,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589550437] [2020-10-24 02:40:41,479 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-24 02:40:41,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:40:41,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-24 02:40:41,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-10-24 02:40:41,480 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 7 states. [2020-10-24 02:40:42,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:40:42,053 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2020-10-24 02:40:42,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-24 02:40:42,054 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-10-24 02:40:42,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:40:42,056 INFO L225 Difference]: With dead ends: 56 [2020-10-24 02:40:42,056 INFO L226 Difference]: Without dead ends: 53 [2020-10-24 02:40:42,058 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:40:42,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-24 02:40:42,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-10-24 02:40:42,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-24 02:40:42,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2020-10-24 02:40:42,079 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 28 [2020-10-24 02:40:42,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:40:42,080 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2020-10-24 02:40:42,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-24 02:40:42,080 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2020-10-24 02:40:42,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-24 02:40:42,081 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:40:42,082 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-24 02:40:42,082 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-24 02:40:42,082 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:40:42,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:40:42,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1821019559, now seen corresponding path program 1 times [2020-10-24 02:40:42,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:40:42,084 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445514772] [2020-10-24 02:40:42,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:40:42,102 ERROR L270 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2020-10-24 02:40:42,102 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2020-10-24 02:40:42,102 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 02:40:42,108 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-24 02:40:42,125 WARN L238 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-10-24 02:40:42,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 02:40:42 BoogieIcfgContainer [2020-10-24 02:40:42,125 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 02:40:42,128 INFO L168 Benchmark]: Toolchain (without parser) took 2741.21 ms. Allocated memory was 167.8 MB in the beginning and 201.3 MB in the end (delta: 33.6 MB). Free memory was 143.6 MB in the beginning and 131.8 MB in the end (delta: 11.8 MB). Peak memory consumption was 46.7 MB. Max. memory is 8.0 GB. [2020-10-24 02:40:42,129 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 167.8 MB. Free memory is still 149.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-24 02:40:42,130 INFO L168 Benchmark]: CACSL2BoogieTranslator took 335.85 ms. Allocated memory is still 167.8 MB. Free memory was 143.0 MB in the beginning and 133.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-24 02:40:42,131 INFO L168 Benchmark]: Boogie Preprocessor took 76.54 ms. Allocated memory is still 167.8 MB. Free memory was 133.5 MB in the beginning and 131.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-24 02:40:42,133 INFO L168 Benchmark]: RCFGBuilder took 512.77 ms. Allocated memory is still 167.8 MB. Free memory was 131.9 MB in the beginning and 117.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-10-24 02:40:42,134 INFO L168 Benchmark]: TraceAbstraction took 1797.10 ms. Allocated memory was 167.8 MB in the beginning and 201.3 MB in the end (delta: 33.6 MB). Free memory was 116.7 MB in the beginning and 131.8 MB in the end (delta: -15.0 MB). Peak memory consumption was 19.4 MB. Max. memory is 8.0 GB. [2020-10-24 02:40:42,139 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 167.8 MB. Free memory is still 149.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 335.85 ms. Allocated memory is still 167.8 MB. Free memory was 143.0 MB in the beginning and 133.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 76.54 ms. Allocated memory is still 167.8 MB. Free memory was 133.5 MB in the beginning and 131.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 512.77 ms. Allocated memory is still 167.8 MB. Free memory was 131.9 MB in the beginning and 117.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1797.10 ms. Allocated memory was 167.8 MB in the beginning and 201.3 MB in the end (delta: 33.6 MB). Free memory was 116.7 MB in the beginning and 131.8 MB in the end (delta: -15.0 MB). Peak memory consumption was 19.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 5]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L21] int n, a, s, t; [L22] n = __VERIFIER_nondet_int() [L24] a = 0 [L25] s = 1 [L26] t = 1 [L28] COND TRUE 1 [L29] CALL __VERIFIER_assert(t == 2*a + 1) [L12] COND FALSE !(!(cond)) [L29] RET __VERIFIER_assert(t == 2*a + 1) [L30] CALL __VERIFIER_assert(s == (a + 1) * (a + 1)) [L12] COND TRUE !(cond) [L14] CALL reach_error() [L5] __assert_fail("0", "sqrt1.c", 5, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 52 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1.7s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 81 SDtfs, 62 SDslu, 58 SDs, 0 SdLazy, 125 SolverSat, 40 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 2 MinimizatonAttempts, 3 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 56 NumberOfCodeBlocks, 56 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 4104 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...