/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-invgen/SpamAssassin-loop.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:06:50,479 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:06:50,481 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:06:50,513 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 18:06:50,513 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 18:06:50,516 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 18:06:50,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 18:06:50,522 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 18:06:50,524 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 18:06:50,528 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 18:06:50,529 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 18:06:50,530 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 18:06:50,530 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:06:50,531 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:06:50,532 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:06:50,534 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:06:50,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:06:50,536 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:06:50,538 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:06:50,542 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:06:50,543 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:06:50,544 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:06:50,545 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:06:50,546 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:06:50,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:06:50,557 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:06:50,558 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:06:50,560 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:06:50,563 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:06:50,588 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:06:50,588 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:06:50,590 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:06:50,590 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:06:50,590 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:06:50,591 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:06:50,591 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:06:50,591 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:06:50,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:06:50,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:06:50,592 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:06:50,592 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:06:50,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:06:50,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:06:50,593 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:06:50,593 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:06:50,594 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:06:50,594 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:06:50,907 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:06:50,924 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:06:50,926 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:06:50,926 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:06:50,927 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:06:50,928 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/SpamAssassin-loop.i [2021-05-02 18:06:50,995 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38b9c35ad/0b697434bd6544c8b6587e9ad0ad58e8/FLAGb9f0ca63d [2021-05-02 18:06:51,358 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:06:51,358 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/SpamAssassin-loop.i [2021-05-02 18:06:51,363 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38b9c35ad/0b697434bd6544c8b6587e9ad0ad58e8/FLAGb9f0ca63d [2021-05-02 18:06:51,377 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/38b9c35ad/0b697434bd6544c8b6587e9ad0ad58e8 [2021-05-02 18:06:51,379 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:06:51,381 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:06:51,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:06:51,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:06:51,388 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:06:51,388 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,389 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dfb7912 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51, skipping insertion in model container [2021-05-02 18:06:51,389 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,393 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:06:51,403 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:06:51,513 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/SpamAssassin-loop.i[893,906] [2021-05-02 18:06:51,534 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:06:51,542 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:06:51,585 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/SpamAssassin-loop.i[893,906] [2021-05-02 18:06:51,603 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:06:51,613 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:06:51,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51 WrapperNode [2021-05-02 18:06:51,614 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:06:51,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:06:51,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:06:51,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:06:51,621 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,631 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,631 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,641 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,644 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,645 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (1/1) ... [2021-05-02 18:06:51,646 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:06:51,646 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:06:51,647 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:06:51,647 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:06:51,647 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (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 [2021-05-02 18:06:51,710 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:06:51,710 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:06:51,710 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:06:51,710 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 18:06:51,710 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:06:51,711 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:06:51,711 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:06:51,711 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:06:51,711 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:06:51,712 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:06:51,713 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:06:51,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:06:51,713 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:06:51,714 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:06:51,715 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:06:52,022 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:06:52,022 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 18:06:52,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:06:52 BoogieIcfgContainer [2021-05-02 18:06:52,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:06:52,024 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:06:52,024 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:06:52,024 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:06:52,026 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:06:52" (1/1) ... [2021-05-02 18:06:52,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:06:52 BasicIcfg [2021-05-02 18:06:52,047 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:06:52,049 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:06:52,049 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:06:52,051 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:06:52,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:06:51" (1/4) ... [2021-05-02 18:06:52,052 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68f9ea3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:06:52, skipping insertion in model container [2021-05-02 18:06:52,052 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:06:51" (2/4) ... [2021-05-02 18:06:52,053 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68f9ea3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:06:52, skipping insertion in model container [2021-05-02 18:06:52,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:06:52" (3/4) ... [2021-05-02 18:06:52,054 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68f9ea3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:06:52, skipping insertion in model container [2021-05-02 18:06:52,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:06:52" (4/4) ... [2021-05-02 18:06:52,055 INFO L111 eAbstractionObserver]: Analyzing ICFG SpamAssassin-loop.iJordan [2021-05-02 18:06:52,061 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:06:52,064 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:06:52,075 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:06:52,100 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:06:52,100 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:06:52,100 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:06:52,100 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:06:52,100 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:06:52,100 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:06:52,100 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:06:52,101 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:06:52,116 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 18 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:52,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:06:52,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:52,124 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:52,124 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:52,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:52,129 INFO L82 PathProgramCache]: Analyzing trace with hash -868390563, now seen corresponding path program 1 times [2021-05-02 18:06:52,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:52,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465218025] [2021-05-02 18:06:52,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:52,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:52,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:52,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:52,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:06:52,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:52,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465218025] [2021-05-02 18:06:52,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465218025] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:52,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:52,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:06:52,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560415161] [2021-05-02 18:06:52,386 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:06:52,386 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:52,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:06:52,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:06:52,395 INFO L87 Difference]: Start difference. First operand has 43 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 18 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:52,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:52,685 INFO L93 Difference]: Finished difference Result 52 states and 74 transitions. [2021-05-02 18:06:52,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:06:52,686 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:06:52,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:52,691 INFO L225 Difference]: With dead ends: 52 [2021-05-02 18:06:52,691 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:06:52,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 122.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:06:52,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:06:52,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-05-02 18:06:52,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 19 states have call successors, (19), 4 states have call predecessors, (19), 3 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:52,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 61 transitions. [2021-05-02 18:06:52,719 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 61 transitions. Word has length 14 [2021-05-02 18:06:52,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:52,720 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 61 transitions. [2021-05-02 18:06:52,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:52,720 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 61 transitions. [2021-05-02 18:06:52,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:06:52,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:52,721 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:52,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:06:52,721 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:52,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:52,721 INFO L82 PathProgramCache]: Analyzing trace with hash -867437251, now seen corresponding path program 1 times [2021-05-02 18:06:52,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:52,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475716371] [2021-05-02 18:06:52,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:52,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:52,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:52,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:52,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:06:52,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:52,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475716371] [2021-05-02 18:06:52,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475716371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:52,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:52,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:06:52,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308484165] [2021-05-02 18:06:52,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:06:52,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:52,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:06:52,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:06:52,782 INFO L87 Difference]: Start difference. First operand 43 states and 61 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:53,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:53,028 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2021-05-02 18:06:53,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:06:53,028 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 18:06:53,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:53,031 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:06:53,031 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:06:53,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:06:53,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:06:53,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 18:06:53,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 19 states have call successors, (19), 6 states have call predecessors, (19), 5 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:53,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 67 transitions. [2021-05-02 18:06:53,039 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 67 transitions. Word has length 14 [2021-05-02 18:06:53,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:53,040 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 67 transitions. [2021-05-02 18:06:53,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:06:53,040 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 67 transitions. [2021-05-02 18:06:53,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 18:06:53,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:53,041 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:53,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:06:53,041 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:53,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:53,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1607544442, now seen corresponding path program 1 times [2021-05-02 18:06:53,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:53,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91156037] [2021-05-02 18:06:53,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:53,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:53,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:53,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,113 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:06:53,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:53,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91156037] [2021-05-02 18:06:53,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91156037] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:53,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:53,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:06:53,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916866052] [2021-05-02 18:06:53,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:06:53,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:53,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:06:53,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:06:53,115 INFO L87 Difference]: Start difference. First operand 51 states and 67 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:06:53,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:53,307 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2021-05-02 18:06:53,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:06:53,308 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-05-02 18:06:53,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:53,309 INFO L225 Difference]: With dead ends: 55 [2021-05-02 18:06:53,309 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 18:06:53,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 84.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:06:53,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 18:06:53,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 18:06:53,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 19 states have call successors, (19), 7 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:53,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2021-05-02 18:06:53,313 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 19 [2021-05-02 18:06:53,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:53,314 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2021-05-02 18:06:53,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 18:06:53,314 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2021-05-02 18:06:53,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 18:06:53,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:53,314 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:53,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:06:53,315 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:53,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:53,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1153064602, now seen corresponding path program 1 times [2021-05-02 18:06:53,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:53,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039972439] [2021-05-02 18:06:53,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:53,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:53,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 18:06:53,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 18:06:53,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:53,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039972439] [2021-05-02 18:06:53,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039972439] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:53,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:53,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 18:06:53,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615436334] [2021-05-02 18:06:53,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:06:53,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:53,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:06:53,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:06:53,378 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:06:53,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:53,606 INFO L93 Difference]: Finished difference Result 59 states and 73 transitions. [2021-05-02 18:06:53,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:06:53,607 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 18:06:53,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:53,608 INFO L225 Difference]: With dead ends: 59 [2021-05-02 18:06:53,608 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:06:53,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 101.1ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:06:53,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:06:53,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 18:06:53,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 32 states have (on average 1.125) internal successors, (36), 33 states have internal predecessors, (36), 19 states have call successors, (19), 8 states have call predecessors, (19), 7 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:53,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2021-05-02 18:06:53,612 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 24 [2021-05-02 18:06:53,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:53,613 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2021-05-02 18:06:53,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 18:06:53,613 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2021-05-02 18:06:53,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:06:53,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:53,614 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:53,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 18:06:53,614 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:53,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:53,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1359459551, now seen corresponding path program 1 times [2021-05-02 18:06:53,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:53,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667325637] [2021-05-02 18:06:53,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:53,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:53,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:53,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 18:06:53,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 18:06:53,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,670 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 18:06:53,670 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:53,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667325637] [2021-05-02 18:06:53,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667325637] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:53,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:53,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:06:53,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045331415] [2021-05-02 18:06:53,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:06:53,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:53,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:06:53,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:06:53,671 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:06:53,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:53,858 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2021-05-02 18:06:53,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 18:06:53,858 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 18:06:53,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:53,859 INFO L225 Difference]: With dead ends: 64 [2021-05-02 18:06:53,859 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 18:06:53,860 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 75.3ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:06:53,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 18:06:53,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 18:06:53,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 36 states have internal predecessors, (39), 19 states have call successors, (19), 9 states have call predecessors, (19), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:53,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-02 18:06:53,863 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 29 [2021-05-02 18:06:53,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:53,864 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-02 18:06:53,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 18:06:53,864 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-02 18:06:53,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:06:53,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:53,865 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:53,865 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 18:06:53,865 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:53,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:53,865 INFO L82 PathProgramCache]: Analyzing trace with hash -1056918318, now seen corresponding path program 1 times [2021-05-02 18:06:53,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:53,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057201583] [2021-05-02 18:06:53,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:53,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:53,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:53,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 18:06:53,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 18:06:53,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 18:06:53,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 18:06:53,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 18:06:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:53,930 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 18:06:53,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:53,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057201583] [2021-05-02 18:06:53,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057201583] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:53,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:53,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 18:06:53,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474269623] [2021-05-02 18:06:53,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:06:53,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:53,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:06:53,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:06:53,931 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 18:06:54,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:54,165 INFO L93 Difference]: Finished difference Result 73 states and 89 transitions. [2021-05-02 18:06:54,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:06:54,165 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-05-02 18:06:54,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:54,166 INFO L225 Difference]: With dead ends: 73 [2021-05-02 18:06:54,166 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 18:06:54,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 91.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 18:06:54,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 18:06:54,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-05-02 18:06:54,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 38 states have (on average 1.105263157894737) internal successors, (42), 39 states have internal predecessors, (42), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:54,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-05-02 18:06:54,171 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 47 [2021-05-02 18:06:54,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:54,172 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-05-02 18:06:54,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 18:06:54,172 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-05-02 18:06:54,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 18:06:54,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:54,173 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:54,173 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 18:06:54,173 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:54,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:54,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1366093938, now seen corresponding path program 1 times [2021-05-02 18:06:54,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:54,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327930993] [2021-05-02 18:06:54,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:54,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:54,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:54,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 18:06:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 18:06:54,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 18:06:54,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 18:06:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 18:06:54,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 18:06:54,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 18:06:54,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,252 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 18:06:54,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:54,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327930993] [2021-05-02 18:06:54,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327930993] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:54,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:54,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 18:06:54,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524380885] [2021-05-02 18:06:54,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 18:06:54,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:54,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 18:06:54,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:06:54,253 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 18:06:54,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:54,486 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2021-05-02 18:06:54,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 18:06:54,486 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 57 [2021-05-02 18:06:54,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:54,487 INFO L225 Difference]: With dead ends: 73 [2021-05-02 18:06:54,487 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 18:06:54,488 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 115.7ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:06:54,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 18:06:54,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-05-02 18:06:54,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 41 states have (on average 1.0975609756097562) internal successors, (45), 42 states have internal predecessors, (45), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 18:06:54,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2021-05-02 18:06:54,494 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 57 [2021-05-02 18:06:54,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:54,494 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2021-05-02 18:06:54,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 18:06:54,495 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2021-05-02 18:06:54,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 18:06:54,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:06:54,495 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:06:54,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 18:06:54,496 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:06:54,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:06:54,496 INFO L82 PathProgramCache]: Analyzing trace with hash -430516171, now seen corresponding path program 1 times [2021-05-02 18:06:54,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:06:54,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175162844] [2021-05-02 18:06:54,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:06:54,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:06:54,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-05-02 18:06:54,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 18:06:54,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 18:06:54,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 18:06:54,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 18:06:54,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 18:06:54,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 18:06:54,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-02 18:06:54,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-02 18:06:54,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-02 18:06:54,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:06:54,592 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-02 18:06:54,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:06:54,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175162844] [2021-05-02 18:06:54,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175162844] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:06:54,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:06:54,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 18:06:54,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900257624] [2021-05-02 18:06:54,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:06:54,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:06:54,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:06:54,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:06:54,594 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-02 18:06:54,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:06:54,861 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-05-02 18:06:54,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:06:54,862 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 68 [2021-05-02 18:06:54,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:06:54,862 INFO L225 Difference]: With dead ends: 71 [2021-05-02 18:06:54,862 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 18:06:54,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 152.9ms TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:06:54,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 18:06:54,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 18:06:54,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 18:06:54,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 18:06:54,863 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2021-05-02 18:06:54,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:06:54,863 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 18:06:54,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-05-02 18:06:54,864 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 18:06:54,864 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 18:06:54,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 18:06:54,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:06:54 BasicIcfg [2021-05-02 18:06:54,867 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:06:54,868 INFO L168 Benchmark]: Toolchain (without parser) took 3486.43 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 150.2 MB in the beginning and 126.6 MB in the end (delta: 23.6 MB). Peak memory consumption was 62.9 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,868 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 184.5 MB. Free memory is still 166.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:06:54,868 INFO L168 Benchmark]: CACSL2BoogieTranslator took 228.97 ms. Allocated memory is still 184.5 MB. Free memory was 150.0 MB in the beginning and 167.5 MB in the end (delta: -17.5 MB). Peak memory consumption was 12.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,868 INFO L168 Benchmark]: Boogie Preprocessor took 31.72 ms. Allocated memory is still 184.5 MB. Free memory was 167.5 MB in the beginning and 166.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,869 INFO L168 Benchmark]: RCFGBuilder took 376.70 ms. Allocated memory is still 184.5 MB. Free memory was 166.1 MB in the beginning and 148.2 MB in the end (delta: 17.8 MB). Peak memory consumption was 17.8 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,869 INFO L168 Benchmark]: IcfgTransformer took 23.73 ms. Allocated memory is still 184.5 MB. Free memory was 147.9 MB in the beginning and 146.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,869 INFO L168 Benchmark]: TraceAbstraction took 2818.16 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 146.1 MB in the beginning and 126.6 MB in the end (delta: 19.6 MB). Peak memory consumption was 58.2 MB. Max. memory is 8.0 GB. [2021-05-02 18:06:54,870 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 184.5 MB. Free memory is still 166.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 228.97 ms. Allocated memory is still 184.5 MB. Free memory was 150.0 MB in the beginning and 167.5 MB in the end (delta: -17.5 MB). Peak memory consumption was 12.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 31.72 ms. Allocated memory is still 184.5 MB. Free memory was 167.5 MB in the beginning and 166.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 376.70 ms. Allocated memory is still 184.5 MB. Free memory was 166.1 MB in the beginning and 148.2 MB in the end (delta: 17.8 MB). Peak memory consumption was 17.8 MB. Max. memory is 8.0 GB. * IcfgTransformer took 23.73 ms. Allocated memory is still 184.5 MB. Free memory was 147.9 MB in the beginning and 146.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2818.16 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 146.1 MB in the beginning and 126.6 MB in the end (delta: 19.6 MB). Peak memory consumption was 58.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 43 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2766.5ms, OverallIterations: 8, TraceHistogramMax: 11, EmptinessCheckTime: 14.9ms, AutomataDifference: 1908.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 286 SDtfs, 247 SDslu, 491 SDs, 0 SdLazy, 1162 SolverSat, 485 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 967.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 169 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 840.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=71occurred in iteration=7, InterpolantAutomatonStates: 63, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 51.0ms AutomataMinimizationTime, 8 MinimizatonAttempts, 15 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 26.5ms SsaConstructionTime, 88.1ms SatisfiabilityAnalysisTime, 554.6ms InterpolantComputationTime, 272 NumberOfCodeBlocks, 272 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 264 ConstructedInterpolants, 0 QuantifiedInterpolants, 732 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 8 PerfectInterpolantSequences, 428/428 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...