./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 02:25:19,010 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:25:19,013 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:25:19,042 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:25:19,042 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:25:19,043 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:25:19,045 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:25:19,046 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:25:19,048 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:25:19,049 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:25:19,050 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:25:19,051 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:25:19,052 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:25:19,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:25:19,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:25:19,055 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:25:19,056 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:25:19,057 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:25:19,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:25:19,061 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:25:19,062 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:25:19,064 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:25:19,065 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:25:19,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:25:19,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:25:19,070 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:25:19,070 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:25:19,071 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:25:19,072 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:25:19,073 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:25:19,073 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:25:19,074 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:25:19,075 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:25:19,075 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:25:19,076 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:25:19,077 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:25:19,078 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:25:19,078 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:25:19,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:25:19,079 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:25:19,080 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:25:19,085 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-03 02:25:19,124 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:25:19,131 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:25:19,132 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:25:19,132 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:25:19,133 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:25:19,133 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:25:19,133 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:25:19,134 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:25:19,134 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:25:19,134 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:25:19,135 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:25:19,136 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:25:19,136 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:25:19,136 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:25:19,136 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:25:19,137 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:25:19,137 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:25:19,137 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:25:19,138 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 02:25:19,138 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 02:25:19,138 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:25:19,138 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:25:19,139 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 02:25:19,139 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:25:19,139 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:25:19,139 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:25:19,139 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 02:25:19,140 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 02:25:19,140 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 02:25:19,140 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:25:19,141 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 02:25:19,141 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:25:19,141 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:25:19,141 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:25:19,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:25:19,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:25:19,143 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:25:19,143 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:25:19,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:25:19,144 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:25:19,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:25:19,144 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:25:19,144 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2022-11-03 02:25:19,438 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:25:19,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:25:19,477 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:25:19,478 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:25:19,479 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:25:19,480 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2022-11-03 02:25:19,555 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/data/b27951320/d2e1903126af42b7a42d4dc4721b3ad1/FLAG04ffd5c7a [2022-11-03 02:25:20,049 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:25:20,050 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2022-11-03 02:25:20,061 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/data/b27951320/d2e1903126af42b7a42d4dc4721b3ad1/FLAG04ffd5c7a [2022-11-03 02:25:20,381 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/data/b27951320/d2e1903126af42b7a42d4dc4721b3ad1 [2022-11-03 02:25:20,383 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:25:20,385 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:25:20,386 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:25:20,386 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:25:20,390 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:25:20,391 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,392 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69c662be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20, skipping insertion in model container [2022-11-03 02:25:20,392 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,399 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:25:20,430 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:25:20,850 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:25:20,859 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:25:20,918 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:25:20,950 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:25:20,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20 WrapperNode [2022-11-03 02:25:20,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:25:20,952 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:25:20,952 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:25:20,952 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:25:20,960 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,993 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,030 INFO L138 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 160 [2022-11-03 02:25:21,030 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:25:21,031 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:25:21,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:25:21,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:25:21,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,045 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,045 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,066 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,068 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,069 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:25:21,073 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:25:21,073 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:25:21,073 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:25:21,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:21,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:25:21,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:21,105 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:25:21,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:25:21,144 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-03 02:25:21,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 02:25:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 02:25:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 02:25:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:25:21,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:25:21,265 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:25:21,267 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:25:21,630 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:25:21,766 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:25:21,766 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-11-03 02:25:21,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:25:21 BoogieIcfgContainer [2022-11-03 02:25:21,769 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:25:21,771 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:25:21,771 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:25:21,786 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:25:21,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:25:20" (1/3) ... [2022-11-03 02:25:21,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4445a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:25:21, skipping insertion in model container [2022-11-03 02:25:21,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (2/3) ... [2022-11-03 02:25:21,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4445a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:25:21, skipping insertion in model container [2022-11-03 02:25:21,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:25:21" (3/3) ... [2022-11-03 02:25:21,789 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2022-11-03 02:25:21,805 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:25:21,806 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2022-11-03 02:25:21,852 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:25:21,859 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@cb1c3e0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:25:21,859 INFO L358 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2022-11-03 02:25:21,864 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:21,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 02:25:21,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:21,871 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 02:25:21,872 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:21,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:21,877 INFO L85 PathProgramCache]: Analyzing trace with hash 220807, now seen corresponding path program 1 times [2022-11-03 02:25:21,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:21,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735583120] [2022-11-03 02:25:21,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:21,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:22,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:22,376 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:22,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:22,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735583120] [2022-11-03 02:25:22,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735583120] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:22,378 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:22,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-03 02:25:22,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849795595] [2022-11-03 02:25:22,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:22,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:25:22,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:22,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:25:22,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:22,416 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 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) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:22,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:22,495 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2022-11-03 02:25:22,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:25:22,498 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-03 02:25:22,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:22,506 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:25:22,507 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 02:25:22,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:22,511 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:22,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:25:22,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 02:25:22,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-03 02:25:22,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:22,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2022-11-03 02:25:22,544 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2022-11-03 02:25:22,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:22,545 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2022-11-03 02:25:22,545 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:22,545 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2022-11-03 02:25:22,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 02:25:22,546 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:22,546 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 02:25:22,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:25:22,547 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:22,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:22,547 INFO L85 PathProgramCache]: Analyzing trace with hash 220808, now seen corresponding path program 1 times [2022-11-03 02:25:22,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:22,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302227159] [2022-11-03 02:25:22,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:22,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:22,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:22,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:22,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:22,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302227159] [2022-11-03 02:25:22,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302227159] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:22,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:22,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:25:22,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777886531] [2022-11-03 02:25:22,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:22,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:25:22,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:22,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:25:22,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:22,855 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:23,106 INFO L93 Difference]: Finished difference Result 112 states and 132 transitions. [2022-11-03 02:25:23,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:25:23,106 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-03 02:25:23,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:23,111 INFO L225 Difference]: With dead ends: 112 [2022-11-03 02:25:23,111 INFO L226 Difference]: Without dead ends: 112 [2022-11-03 02:25:23,118 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:23,120 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 127 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:23,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 109 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:25:23,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-11-03 02:25:23,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 59. [2022-11-03 02:25:23,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 58 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2022-11-03 02:25:23,137 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 3 [2022-11-03 02:25:23,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:23,137 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2022-11-03 02:25:23,138 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,138 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2022-11-03 02:25:23,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 02:25:23,138 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:23,138 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 02:25:23,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:25:23,139 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:23,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:23,140 INFO L85 PathProgramCache]: Analyzing trace with hash 7020437, now seen corresponding path program 1 times [2022-11-03 02:25:23,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:23,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468448921] [2022-11-03 02:25:23,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:23,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:23,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:23,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:23,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468448921] [2022-11-03 02:25:23,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468448921] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:23,215 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:23,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:25:23,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824814342] [2022-11-03 02:25:23,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:23,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:25:23,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:23,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:25:23,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:23,219 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:23,272 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2022-11-03 02:25:23,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:25:23,273 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-03 02:25:23,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:23,276 INFO L225 Difference]: With dead ends: 63 [2022-11-03 02:25:23,276 INFO L226 Difference]: Without dead ends: 63 [2022-11-03 02:25:23,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:23,284 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 69 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:23,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 100 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:23,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-03 02:25:23,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2022-11-03 02:25:23,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 59 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 71 transitions. [2022-11-03 02:25:23,294 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 71 transitions. Word has length 4 [2022-11-03 02:25:23,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:23,295 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 71 transitions. [2022-11-03 02:25:23,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,298 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 71 transitions. [2022-11-03 02:25:23,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 02:25:23,299 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:23,299 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 02:25:23,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 02:25:23,300 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:23,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:23,302 INFO L85 PathProgramCache]: Analyzing trace with hash 7015653, now seen corresponding path program 1 times [2022-11-03 02:25:23,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:23,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382583192] [2022-11-03 02:25:23,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:23,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:23,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:23,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:23,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:23,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382583192] [2022-11-03 02:25:23,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382583192] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:23,365 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:23,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-03 02:25:23,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108261561] [2022-11-03 02:25:23,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:23,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:25:23,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:23,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:25:23,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:23,369 INFO L87 Difference]: Start difference. First operand 60 states and 71 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:23,413 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2022-11-03 02:25:23,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:25:23,414 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-03 02:25:23,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:23,414 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:25:23,414 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 02:25:23,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:23,416 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 60 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:23,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 36 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:23,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 02:25:23,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-11-03 02:25:23,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.864864864864865) internal successors, (69), 57 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2022-11-03 02:25:23,420 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 4 [2022-11-03 02:25:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:23,421 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2022-11-03 02:25:23,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,421 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2022-11-03 02:25:23,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 02:25:23,422 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:23,422 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 02:25:23,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 02:25:23,422 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:23,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:23,423 INFO L85 PathProgramCache]: Analyzing trace with hash 7015654, now seen corresponding path program 1 times [2022-11-03 02:25:23,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:23,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572746085] [2022-11-03 02:25:23,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:23,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:23,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:23,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:23,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:23,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572746085] [2022-11-03 02:25:23,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572746085] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:23,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:23,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:25:23,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986165630] [2022-11-03 02:25:23,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:23,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:25:23,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:23,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:25:23,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:23,471 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:23,506 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2022-11-03 02:25:23,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:25:23,507 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-03 02:25:23,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:23,508 INFO L225 Difference]: With dead ends: 58 [2022-11-03 02:25:23,508 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 02:25:23,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:25:23,509 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 1 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:23,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 97 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:23,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 02:25:23,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-11-03 02:25:23,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.837837837837838) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2022-11-03 02:25:23,513 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 4 [2022-11-03 02:25:23,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:23,514 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2022-11-03 02:25:23,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:23,514 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2022-11-03 02:25:23,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 02:25:23,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:23,514 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-03 02:25:23,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 02:25:23,515 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:23,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:23,515 INFO L85 PathProgramCache]: Analyzing trace with hash 212351948, now seen corresponding path program 1 times [2022-11-03 02:25:23,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:23,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167520331] [2022-11-03 02:25:23,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:23,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:23,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:23,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:23,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:23,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167520331] [2022-11-03 02:25:23,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167520331] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:23,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582563684] [2022-11-03 02:25:23,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:23,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:23,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:23,818 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:23,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:25:23,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:23,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:25:23,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:24,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:24,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 13 [2022-11-03 02:25:24,071 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:25:24,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:24,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:24,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:25:24,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582563684] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:24,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089041077] [2022-11-03 02:25:24,465 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-03 02:25:24,465 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:24,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:24,476 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:24,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:24,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:24,581 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:24,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:24,765 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:24,810 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:24,851 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:25,189 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '758#(and (not (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|))) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet25#1|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_main_#t~nondet25#1| 127) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:25,190 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:25,190 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:25,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-03 02:25:25,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386918096] [2022-11-03 02:25:25,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:25,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:25:25,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:25,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:25:25,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:25:25,192 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:25,516 INFO L93 Difference]: Finished difference Result 110 states and 130 transitions. [2022-11-03 02:25:25,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:25:25,517 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-03 02:25:25,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:25,518 INFO L225 Difference]: With dead ends: 110 [2022-11-03 02:25:25,518 INFO L226 Difference]: Without dead ends: 110 [2022-11-03 02:25:25,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:25:25,519 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 186 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:25,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 170 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:25:25,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-03 02:25:25,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 62. [2022-11-03 02:25:25,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 42 states have (on average 1.7857142857142858) internal successors, (75), 61 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 75 transitions. [2022-11-03 02:25:25,524 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 75 transitions. Word has length 5 [2022-11-03 02:25:25,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:25,524 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 75 transitions. [2022-11-03 02:25:25,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,525 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 75 transitions. [2022-11-03 02:25:25,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 02:25:25,525 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:25,525 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 02:25:25,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:25,725 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:25,726 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:25,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:25,727 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853598, now seen corresponding path program 1 times [2022-11-03 02:25:25,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:25,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523506388] [2022-11-03 02:25:25,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:25,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:25,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:25,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:25,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:25,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523506388] [2022-11-03 02:25:25,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523506388] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:25,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:25,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:25:25,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049396502] [2022-11-03 02:25:25,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:25,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:25:25,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:25,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:25:25,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:25,886 INFO L87 Difference]: Start difference. First operand 62 states and 75 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:25,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:25,986 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2022-11-03 02:25:25,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:25:25,987 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 02:25:25,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:25,988 INFO L225 Difference]: With dead ends: 64 [2022-11-03 02:25:25,988 INFO L226 Difference]: Without dead ends: 64 [2022-11-03 02:25:25,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:25:25,989 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 63 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:25,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 102 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:25:25,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-03 02:25:26,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-11-03 02:25:26,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 44 states have (on average 1.75) internal successors, (77), 63 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:26,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2022-11-03 02:25:26,011 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 6 [2022-11-03 02:25:26,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:26,011 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2022-11-03 02:25:26,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:26,014 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2022-11-03 02:25:26,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-03 02:25:26,014 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:26,014 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:26,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-03 02:25:26,016 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:26,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:26,016 INFO L85 PathProgramCache]: Analyzing trace with hash -145849192, now seen corresponding path program 1 times [2022-11-03 02:25:26,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:26,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426190980] [2022-11-03 02:25:26,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:26,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:26,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:26,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:26,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426190980] [2022-11-03 02:25:26,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426190980] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:26,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352625786] [2022-11-03 02:25:26,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:26,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:26,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:26,317 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:26,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:25:26,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:26,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 02:25:26,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:26,444 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 02:25:26,444 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-03 02:25:26,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:26,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:26,843 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:26,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352625786] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:26,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952224362] [2022-11-03 02:25:26,845 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-03 02:25:26,846 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:26,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:26,846 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:26,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:26,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:26,890 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:26,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:27,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,106 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,163 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,284 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:27,323 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:27,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1128#(and (not (<= (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|))) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_#t~nondet27#1| 127) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet27#1|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:27,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:27,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:27,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-11-03 02:25:27,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030415957] [2022-11-03 02:25:27,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:27,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:25:27,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:27,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:25:27,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2022-11-03 02:25:27,899 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:28,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:28,086 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2022-11-03 02:25:28,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:25:28,087 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-03 02:25:28,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:28,087 INFO L225 Difference]: With dead ends: 62 [2022-11-03 02:25:28,088 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 02:25:28,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:25:28,088 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 120 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:28,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 104 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:25:28,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 02:25:28,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-11-03 02:25:28,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 42 states have (on average 1.7142857142857142) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:28,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-03 02:25:28,091 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 8 [2022-11-03 02:25:28,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:28,092 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-03 02:25:28,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:28,092 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-03 02:25:28,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:25:28,092 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:28,092 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:28,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:28,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:28,305 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:28,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:28,306 INFO L85 PathProgramCache]: Analyzing trace with hash -1003133821, now seen corresponding path program 1 times [2022-11-03 02:25:28,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:28,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974457302] [2022-11-03 02:25:28,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:28,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:28,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:28,442 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:28,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:28,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974457302] [2022-11-03 02:25:28,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974457302] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:28,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415412842] [2022-11-03 02:25:28,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:28,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:28,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:28,444 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:28,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:25:28,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:28,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:25:28,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:28,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:28,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:28,722 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2022-11-03 02:25:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:28,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415412842] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:28,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117935172] [2022-11-03 02:25:28,774 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 02:25:28,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:28,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:28,775 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:28,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:28,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:28,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:28,852 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:28,895 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:28,918 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:28,990 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:29,036 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:29,065 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:29,116 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:30,013 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1330#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (not (< |ULTIMATE.start_main_~i~1#1| |ULTIMATE.start_main_~length2~0#1|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (not (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|))) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:30,013 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:30,014 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:30,014 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2022-11-03 02:25:30,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131032281] [2022-11-03 02:25:30,014 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:30,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 02:25:30,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:30,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 02:25:30,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=383, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:25:30,015 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 17 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:30,274 INFO L93 Difference]: Finished difference Result 104 states and 124 transitions. [2022-11-03 02:25:30,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:25:30,274 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 02:25:30,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:30,275 INFO L225 Difference]: With dead ends: 104 [2022-11-03 02:25:30,275 INFO L226 Difference]: Without dead ends: 104 [2022-11-03 02:25:30,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=176, Invalid=526, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:25:30,276 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 461 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 461 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:30,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [461 Valid, 272 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:25:30,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-03 02:25:30,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 53. [2022-11-03 02:25:30,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.75) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-11-03 02:25:30,279 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 10 [2022-11-03 02:25:30,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:30,279 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-11-03 02:25:30,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,279 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-11-03 02:25:30,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:25:30,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:30,280 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:30,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:30,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 02:25:30,481 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:30,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:30,481 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447746, now seen corresponding path program 1 times [2022-11-03 02:25:30,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:30,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187659660] [2022-11-03 02:25:30,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:30,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:30,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:30,531 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:30,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:30,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187659660] [2022-11-03 02:25:30,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187659660] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:30,532 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:30,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:25:30,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344476418] [2022-11-03 02:25:30,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:30,533 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:25:30,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:30,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:25:30,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:30,534 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:30,597 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2022-11-03 02:25:30,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:25:30,598 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 02:25:30,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:30,598 INFO L225 Difference]: With dead ends: 52 [2022-11-03 02:25:30,599 INFO L226 Difference]: Without dead ends: 52 [2022-11-03 02:25:30,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:30,599 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:30,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 63 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:25:30,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-03 02:25:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-03 02:25:30,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 51 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2022-11-03 02:25:30,608 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2022-11-03 02:25:30,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:30,608 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2022-11-03 02:25:30,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:30,608 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2022-11-03 02:25:30,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:25:30,609 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:30,609 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:30,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-03 02:25:30,610 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:30,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:30,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447747, now seen corresponding path program 1 times [2022-11-03 02:25:30,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:30,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335100039] [2022-11-03 02:25:30,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:30,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:30,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:30,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:30,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:30,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335100039] [2022-11-03 02:25:30,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335100039] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:30,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479748933] [2022-11-03 02:25:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:30,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:30,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:30,804 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:30,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:25:30,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:30,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:25:30,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:30,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:30,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:30,967 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2022-11-03 02:25:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:30,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479748933] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:30,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788327738] [2022-11-03 02:25:30,988 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-03 02:25:30,988 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:30,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:30,989 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:30,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:31,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:31,037 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:31,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,125 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,148 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,206 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:31,251 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,281 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:31,497 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:31,497 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:31,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:32,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [788327738] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:32,672 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:32,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 4, 4] total 14 [2022-11-03 02:25:32,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268660656] [2022-11-03 02:25:32,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:32,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 02:25:32,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:32,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 02:25:32,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:25:32,674 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:32,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:32,883 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2022-11-03 02:25:32,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:25:32,883 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-03 02:25:32,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:32,884 INFO L225 Difference]: With dead ends: 51 [2022-11-03 02:25:32,884 INFO L226 Difference]: Without dead ends: 51 [2022-11-03 02:25:32,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:25:32,885 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 146 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:32,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 87 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:25:32,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-03 02:25:32,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-03 02:25:32,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:32,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2022-11-03 02:25:32,887 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2022-11-03 02:25:32,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:32,887 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2022-11-03 02:25:32,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:32,887 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2022-11-03 02:25:32,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-03 02:25:32,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:32,888 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:32,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:33,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 02:25:33,101 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:33,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:33,102 INFO L85 PathProgramCache]: Analyzing trace with hash -196055170, now seen corresponding path program 1 times [2022-11-03 02:25:33,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:33,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062856592] [2022-11-03 02:25:33,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:33,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:33,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:33,225 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:33,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:33,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062856592] [2022-11-03 02:25:33,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062856592] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:33,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:33,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:25:33,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292659773] [2022-11-03 02:25:33,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:33,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:25:33,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:33,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:25:33,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:33,229 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:33,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:33,293 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2022-11-03 02:25:33,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:25:33,294 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-03 02:25:33,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:33,294 INFO L225 Difference]: With dead ends: 52 [2022-11-03 02:25:33,295 INFO L226 Difference]: Without dead ends: 52 [2022-11-03 02:25:33,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:25:33,296 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 139 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:33,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 37 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:33,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-03 02:25:33,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2022-11-03 02:25:33,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:33,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-03 02:25:33,300 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2022-11-03 02:25:33,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:33,300 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-03 02:25:33,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:33,301 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-03 02:25:33,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-03 02:25:33,302 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:33,302 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:33,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-03 02:25:33,302 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:33,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:33,303 INFO L85 PathProgramCache]: Analyzing trace with hash -196055169, now seen corresponding path program 1 times [2022-11-03 02:25:33,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:33,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828657292] [2022-11-03 02:25:33,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:33,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:33,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:33,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:33,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:33,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828657292] [2022-11-03 02:25:33,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828657292] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:33,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91350885] [2022-11-03 02:25:33,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:33,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:33,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:33,920 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:33,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:25:34,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:34,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:25:34,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:34,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,139 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:25:34,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:25:34,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:34,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:34,183 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2022-11-03 02:25:34,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-03 02:25:34,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:34,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91350885] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:34,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1160816050] [2022-11-03 02:25:34,279 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-03 02:25:34,279 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:34,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:34,280 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:34,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:34,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:34,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:34,365 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:34,418 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,585 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,641 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,677 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,724 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:34,764 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:34,765 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:34,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:36,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1160816050] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:36,438 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:36,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 28 [2022-11-03 02:25:36,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618442347] [2022-11-03 02:25:36,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:36,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:25:36,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:36,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:25:36,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:25:36,440 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:36,777 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2022-11-03 02:25:36,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:25:36,778 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-03 02:25:36,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:36,778 INFO L225 Difference]: With dead ends: 55 [2022-11-03 02:25:36,778 INFO L226 Difference]: Without dead ends: 55 [2022-11-03 02:25:36,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:25:36,779 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 112 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:36,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 109 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:25:36,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-03 02:25:36,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2022-11-03 02:25:36,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2022-11-03 02:25:36,781 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2022-11-03 02:25:36,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:36,782 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2022-11-03 02:25:36,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:36,782 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2022-11-03 02:25:36,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:25:36,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:36,782 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:36,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:36,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:36,983 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:36,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:36,984 INFO L85 PathProgramCache]: Analyzing trace with hash 569547529, now seen corresponding path program 1 times [2022-11-03 02:25:36,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:36,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495744508] [2022-11-03 02:25:36,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:36,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:37,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:37,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:37,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495744508] [2022-11-03 02:25:37,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1495744508] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:37,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141655582] [2022-11-03 02:25:37,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:37,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:37,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:37,428 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:37,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:25:37,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:37,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:25:37,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:37,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:37,681 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:25:37,681 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:25:37,702 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:37,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:37,731 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2022-11-03 02:25:37,733 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-03 02:25:37,842 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:37,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141655582] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:37,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1458787768] [2022-11-03 02:25:37,844 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:25:37,844 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:37,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:37,844 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:37,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:37,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:37,891 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:37,933 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:37,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:37,997 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,113 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,169 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,219 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,270 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:38,323 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:38,327 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:38,850 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:41,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2193#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:41,638 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:41,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:41,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 21 [2022-11-03 02:25:41,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032901106] [2022-11-03 02:25:41,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:41,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-03 02:25:41,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:41,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-03 02:25:41,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=886, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:25:41,640 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:42,173 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2022-11-03 02:25:42,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:25:42,174 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 02:25:42,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:42,174 INFO L225 Difference]: With dead ends: 66 [2022-11-03 02:25:42,174 INFO L226 Difference]: Without dead ends: 66 [2022-11-03 02:25:42,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=161, Invalid=1245, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 02:25:42,175 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 35 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:42,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 522 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 337 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2022-11-03 02:25:42,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-03 02:25:42,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 57. [2022-11-03 02:25:42,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 56 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2022-11-03 02:25:42,178 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2022-11-03 02:25:42,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:42,178 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2022-11-03 02:25:42,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,179 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2022-11-03 02:25:42,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:25:42,179 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:42,179 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:42,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:42,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:25:42,385 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:42,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:42,386 INFO L85 PathProgramCache]: Analyzing trace with hash 572774269, now seen corresponding path program 1 times [2022-11-03 02:25:42,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:42,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421428061] [2022-11-03 02:25:42,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:42,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:42,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:42,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:42,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:42,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421428061] [2022-11-03 02:25:42,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421428061] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:42,527 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:42,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:25:42,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685257511] [2022-11-03 02:25:42,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:42,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:25:42,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:42,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:25:42,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:42,528 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:42,581 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2022-11-03 02:25:42,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:25:42,581 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-03 02:25:42,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:42,582 INFO L225 Difference]: With dead ends: 56 [2022-11-03 02:25:42,582 INFO L226 Difference]: Without dead ends: 48 [2022-11-03 02:25:42,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:42,585 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:42,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 64 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:42,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-03 02:25:42,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-11-03 02:25:42,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.6) internal successors, (56), 47 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2022-11-03 02:25:42,588 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2022-11-03 02:25:42,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:42,588 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2022-11-03 02:25:42,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:42,588 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2022-11-03 02:25:42,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-03 02:25:42,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:42,589 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:42,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-03 02:25:42,590 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:42,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:42,590 INFO L85 PathProgramCache]: Analyzing trace with hash 922644863, now seen corresponding path program 2 times [2022-11-03 02:25:42,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:42,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440450044] [2022-11-03 02:25:42,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:42,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:42,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:43,102 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:43,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:43,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440450044] [2022-11-03 02:25:43,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440450044] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:43,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257648107] [2022-11-03 02:25:43,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:25:43,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:43,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:43,105 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:43,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:25:43,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:25:43,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:43,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-03 02:25:43,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:43,218 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:25:43,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-03 02:25:43,261 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-03 02:25:43,420 INFO L356 Elim1Store]: treesize reduction 4, result has 78.9 percent of original size [2022-11-03 02:25:43,421 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 25 [2022-11-03 02:25:43,491 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:25:43,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:43,711 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2022-11-03 02:25:43,717 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 23 [2022-11-03 02:25:43,919 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:25:43,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257648107] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:43,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [942058672] [2022-11-03 02:25:43,923 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:25:43,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:43,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:43,924 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:43,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:43,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:43,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:44,001 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,085 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,294 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,336 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:44,378 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:44,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:44,876 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:48,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2561#(and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |#NULL.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2022-11-03 02:25:48,120 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:48,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:48,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 23 [2022-11-03 02:25:48,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487585288] [2022-11-03 02:25:48,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:48,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 02:25:48,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:48,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 02:25:48,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1035, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 02:25:48,122 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:48,865 INFO L93 Difference]: Finished difference Result 122 states and 143 transitions. [2022-11-03 02:25:48,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:25:48,865 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-03 02:25:48,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:48,866 INFO L225 Difference]: With dead ends: 122 [2022-11-03 02:25:48,866 INFO L226 Difference]: Without dead ends: 122 [2022-11-03 02:25:48,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=246, Invalid=1734, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:25:48,867 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 97 mSDsluCounter, 678 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:48,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 684 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 512 Invalid, 0 Unknown, 102 Unchecked, 0.4s Time] [2022-11-03 02:25:48,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-03 02:25:48,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 58. [2022-11-03 02:25:48,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 45 states have (on average 1.511111111111111) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2022-11-03 02:25:48,870 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2022-11-03 02:25:48,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:48,870 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2022-11-03 02:25:48,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:48,871 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2022-11-03 02:25:48,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:25:48,871 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:48,871 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:48,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:49,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:25:49,073 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:49,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:49,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515559, now seen corresponding path program 1 times [2022-11-03 02:25:49,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:49,074 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210017561] [2022-11-03 02:25:49,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:49,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:49,149 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:25:49,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:49,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210017561] [2022-11-03 02:25:49,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210017561] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:49,149 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:49,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:25:49,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602867276] [2022-11-03 02:25:49,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:49,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:25:49,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:49,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:25:49,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:49,151 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:49,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:49,217 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2022-11-03 02:25:49,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:25:49,217 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-03 02:25:49,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:49,219 INFO L225 Difference]: With dead ends: 57 [2022-11-03 02:25:49,220 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 02:25:49,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:25:49,220 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 78 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:49,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 49 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:49,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 02:25:49,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-03 02:25:49,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.488888888888889) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:49,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2022-11-03 02:25:49,223 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2022-11-03 02:25:49,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:49,223 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2022-11-03 02:25:49,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:49,223 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2022-11-03 02:25:49,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:25:49,225 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:49,225 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:49,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-03 02:25:49,226 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:49,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:49,226 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515558, now seen corresponding path program 1 times [2022-11-03 02:25:49,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:49,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405947495] [2022-11-03 02:25:49,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:49,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:49,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:25:49,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:49,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405947495] [2022-11-03 02:25:49,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405947495] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:49,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924652052] [2022-11-03 02:25:49,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:49,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:49,396 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:49,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:25:49,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:49,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 02:25:49,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:49,596 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:25:49,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:49,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2022-11-03 02:25:49,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:25:49,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924652052] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:49,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [444669249] [2022-11-03 02:25:49,687 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-03 02:25:49,688 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:49,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:49,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:49,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:49,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:49,720 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:49,761 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:49,806 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:49,833 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:49,883 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:25:49,965 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:49,993 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:50,048 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:50,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:50,246 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:53,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [444669249] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:53,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:53,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 4, 4] total 18 [2022-11-03 02:25:53,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248696604] [2022-11-03 02:25:53,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:53,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:25:53,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:53,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:25:53,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=272, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:25:53,753 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:54,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:54,170 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2022-11-03 02:25:54,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:25:54,171 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-03 02:25:54,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:54,171 INFO L225 Difference]: With dead ends: 62 [2022-11-03 02:25:54,171 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 02:25:54,171 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=108, Invalid=272, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:25:54,172 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 59 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:54,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 108 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:25:54,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 02:25:54,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-11-03 02:25:54,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 60 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:54,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2022-11-03 02:25:54,174 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 19 [2022-11-03 02:25:54,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:54,174 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2022-11-03 02:25:54,174 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:54,174 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2022-11-03 02:25:54,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 02:25:54,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:54,175 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:54,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:54,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:25:54,376 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:54,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:54,376 INFO L85 PathProgramCache]: Analyzing trace with hash -690501505, now seen corresponding path program 3 times [2022-11-03 02:25:54,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:54,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805153365] [2022-11-03 02:25:54,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:54,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:54,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:54,856 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:54,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:54,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805153365] [2022-11-03 02:25:54,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805153365] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:54,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607436928] [2022-11-03 02:25:54,857 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:25:54,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:54,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:54,859 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:54,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:25:54,963 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:25:54,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:25:54,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 02:25:54,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:55,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:25:55,137 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:55,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:55,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-03 02:25:55,158 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:25:55,261 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:55,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607436928] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:55,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [408744513] [2022-11-03 02:25:55,263 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:25:55,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:55,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:55,264 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:55,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:55,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:25:55,295 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:25:55,327 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,377 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,400 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,457 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:25:55,515 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,545 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,624 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:25:55,678 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:25:55,679 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:25:55,963 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:58,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3282#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:25:58,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:25:58,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:25:58,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2022-11-03 02:25:58,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815376037] [2022-11-03 02:25:58,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:25:58,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:25:58,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:58,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:25:58,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=878, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:25:58,631 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:59,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:59,422 INFO L93 Difference]: Finished difference Result 168 states and 195 transitions. [2022-11-03 02:25:59,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:25:59,422 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-03 02:25:59,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:59,423 INFO L225 Difference]: With dead ends: 168 [2022-11-03 02:25:59,423 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 02:25:59,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=256, Invalid=1724, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:25:59,424 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 752 mSDsluCounter, 1023 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 752 SdHoareTripleChecker+Valid, 1001 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:59,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [752 Valid, 1001 Invalid, 606 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:25:59,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 02:25:59,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 71. [2022-11-03 02:25:59,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.4067796610169492) internal successors, (83), 70 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:59,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2022-11-03 02:25:59,428 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 20 [2022-11-03 02:25:59,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:59,428 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2022-11-03 02:25:59,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:25:59,429 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2022-11-03 02:25:59,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 02:25:59,429 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:59,430 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:59,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:59,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:59,653 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:25:59,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:59,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1890947467, now seen corresponding path program 4 times [2022-11-03 02:25:59,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:59,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674447110] [2022-11-03 02:25:59,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:59,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:59,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:59,984 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:25:59,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:59,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674447110] [2022-11-03 02:25:59,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674447110] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:25:59,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466958221] [2022-11-03 02:25:59,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:25:59,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:59,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:59,986 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:00,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:26:00,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:00,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-03 02:26:00,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:00,177 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:26:00,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:00,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:26:00,374 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:26:00,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466958221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:00,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737503574] [2022-11-03 02:26:00,375 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:26:00,376 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:00,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:00,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:00,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:00,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:00,403 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:00,451 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:00,493 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:00,516 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:00,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:00,613 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:00,640 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:00,710 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:00,763 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:00,764 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:01,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:03,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3703#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:03,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:03,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:03,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2022-11-03 02:26:03,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076177604] [2022-11-03 02:26:03,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:03,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 02:26:03,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:03,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 02:26:03,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:26:03,642 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand has 20 states, 19 states have (on average 2.0) internal successors, (38), 20 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:04,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:04,374 INFO L93 Difference]: Finished difference Result 231 states and 270 transitions. [2022-11-03 02:26:04,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:26:04,374 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 20 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-03 02:26:04,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:04,376 INFO L225 Difference]: With dead ends: 231 [2022-11-03 02:26:04,377 INFO L226 Difference]: Without dead ends: 231 [2022-11-03 02:26:04,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=249, Invalid=1311, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:26:04,378 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 985 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 985 SdHoareTripleChecker+Valid, 819 SdHoareTripleChecker+Invalid, 821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:04,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [985 Valid, 819 Invalid, 821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:26:04,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2022-11-03 02:26:04,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 73. [2022-11-03 02:26:04,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 61 states have (on average 1.4098360655737705) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:04,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2022-11-03 02:26:04,382 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 22 [2022-11-03 02:26:04,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:04,382 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2022-11-03 02:26:04,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.0) internal successors, (38), 20 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:04,382 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2022-11-03 02:26:04,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 02:26:04,383 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:04,383 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:04,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:04,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:04,593 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:04,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:04,593 INFO L85 PathProgramCache]: Analyzing trace with hash 460224418, now seen corresponding path program 1 times [2022-11-03 02:26:04,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:04,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779602929] [2022-11-03 02:26:04,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:04,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:04,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:04,991 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:04,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:04,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779602929] [2022-11-03 02:26:04,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779602929] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:04,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316210139] [2022-11-03 02:26:04,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:04,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:04,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:04,994 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:05,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:26:05,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:05,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-03 02:26:05,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:05,115 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:26:05,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:05,267 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:26:05,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:26:05,323 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:05,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:05,344 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_402 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_402) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0)) is different from false [2022-11-03 02:26:05,350 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:05,351 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2022-11-03 02:26:05,397 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:05,397 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 30 [2022-11-03 02:26:05,568 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:05,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316210139] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:05,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [164747729] [2022-11-03 02:26:05,570 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:26:05,570 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:05,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:05,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:05,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:05,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:05,604 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:05,632 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:05,668 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:05,697 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:05,751 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:26:05,751 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:26:05,864 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:05,922 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:05,974 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:05,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:06,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:11,107 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4188#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:11,107 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:11,107 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:11,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2022-11-03 02:26:11,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894224246] [2022-11-03 02:26:11,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:11,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:26:11,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:11,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:26:11,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1043, Unknown=1, NotChecked=66, Total=1260 [2022-11-03 02:26:11,109 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:11,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:11,342 INFO L93 Difference]: Finished difference Result 121 states and 141 transitions. [2022-11-03 02:26:11,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:26:11,343 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-03 02:26:11,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:11,343 INFO L225 Difference]: With dead ends: 121 [2022-11-03 02:26:11,343 INFO L226 Difference]: Without dead ends: 110 [2022-11-03 02:26:11,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=182, Invalid=1303, Unknown=1, NotChecked=74, Total=1560 [2022-11-03 02:26:11,345 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 25 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:11,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 359 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 193 Invalid, 0 Unknown, 64 Unchecked, 0.1s Time] [2022-11-03 02:26:11,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-03 02:26:11,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 107. [2022-11-03 02:26:11,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 95 states have (on average 1.3263157894736841) internal successors, (126), 106 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:11,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 126 transitions. [2022-11-03 02:26:11,348 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 126 transitions. Word has length 23 [2022-11-03 02:26:11,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:11,349 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 126 transitions. [2022-11-03 02:26:11,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:11,349 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 126 transitions. [2022-11-03 02:26:11,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-03 02:26:11,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:11,353 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:11,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:11,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 02:26:11,573 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:11,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:11,574 INFO L85 PathProgramCache]: Analyzing trace with hash 2062077594, now seen corresponding path program 1 times [2022-11-03 02:26:11,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:11,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580086125] [2022-11-03 02:26:11,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:11,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:11,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:11,721 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:11,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:11,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580086125] [2022-11-03 02:26:11,721 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [580086125] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:11,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697854478] [2022-11-03 02:26:11,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:11,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:11,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:11,725 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:11,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:26:11,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:11,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 02:26:11,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:11,924 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:11,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:12,000 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2022-11-03 02:26:12,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:12,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697854478] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:12,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2082849593] [2022-11-03 02:26:12,018 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-03 02:26:12,018 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:12,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:12,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:12,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:12,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:12,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:12,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:12,124 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:12,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:12,223 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:26:12,225 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:26:12,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:12,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:12,364 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:12,365 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:12,602 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:15,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4580#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:15,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:15,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:15,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2022-11-03 02:26:15,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310319321] [2022-11-03 02:26:15,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:15,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:26:15,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:15,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:26:15,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2022-11-03 02:26:15,041 INFO L87 Difference]: Start difference. First operand 107 states and 126 transitions. Second operand has 7 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:15,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:15,164 INFO L93 Difference]: Finished difference Result 110 states and 128 transitions. [2022-11-03 02:26:15,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:26:15,166 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-03 02:26:15,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:15,166 INFO L225 Difference]: With dead ends: 110 [2022-11-03 02:26:15,166 INFO L226 Difference]: Without dead ends: 98 [2022-11-03 02:26:15,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:26:15,168 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 97 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:15,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 88 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:26:15,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-03 02:26:15,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2022-11-03 02:26:15,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 80 states have (on average 1.35) internal successors, (108), 91 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:15,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2022-11-03 02:26:15,176 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 23 [2022-11-03 02:26:15,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:15,176 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2022-11-03 02:26:15,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:15,176 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2022-11-03 02:26:15,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 02:26:15,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:15,181 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:15,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:15,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:15,396 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:15,397 INFO L85 PathProgramCache]: Analyzing trace with hash -429345665, now seen corresponding path program 5 times [2022-11-03 02:26:15,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:15,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112868103] [2022-11-03 02:26:15,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:15,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:15,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:15,866 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:26:15,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:15,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112868103] [2022-11-03 02:26:15,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112868103] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:15,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707626455] [2022-11-03 02:26:15,866 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:26:15,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:15,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:15,867 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:15,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:26:15,990 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:26:15,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:26:15,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 02:26:15,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:16,098 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:17,655 INFO L356 Elim1Store]: treesize reduction 12, result has 87.6 percent of original size [2022-11-03 02:26:17,656 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 42 treesize of output 103 [2022-11-03 02:26:18,223 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:26:18,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:18,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 45 [2022-11-03 02:26:18,997 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:18,998 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 85 treesize of output 125 [2022-11-03 02:26:19,286 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 41 [2022-11-03 02:26:19,349 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:26:19,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707626455] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:19,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443598119] [2022-11-03 02:26:19,351 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:26:19,351 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:19,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:19,351 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:19,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:19,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:19,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:19,429 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:19,473 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,493 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,537 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,576 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,625 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,663 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,693 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:19,734 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:19,735 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:20,051 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:23,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4980#(and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |#NULL.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2022-11-03 02:26:23,588 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:23,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:23,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 39 [2022-11-03 02:26:23,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036081564] [2022-11-03 02:26:23,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:23,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-03 02:26:23,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:23,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-03 02:26:23,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=2313, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:26:23,591 INFO L87 Difference]: Start difference. First operand 92 states and 108 transitions. Second operand has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:26,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:26,022 INFO L93 Difference]: Finished difference Result 163 states and 190 transitions. [2022-11-03 02:26:26,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-03 02:26:26,023 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-03 02:26:26,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:26,024 INFO L225 Difference]: With dead ends: 163 [2022-11-03 02:26:26,025 INFO L226 Difference]: Without dead ends: 153 [2022-11-03 02:26:26,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1862 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=607, Invalid=6035, Unknown=0, NotChecked=0, Total=6642 [2022-11-03 02:26:26,026 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 109 mSDsluCounter, 910 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 249 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:26,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 893 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 623 Invalid, 0 Unknown, 249 Unchecked, 0.4s Time] [2022-11-03 02:26:26,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-11-03 02:26:26,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 114. [2022-11-03 02:26:26,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 102 states have (on average 1.3235294117647058) internal successors, (135), 113 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:26,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 135 transitions. [2022-11-03 02:26:26,031 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 135 transitions. Word has length 24 [2022-11-03 02:26:26,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:26,032 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 135 transitions. [2022-11-03 02:26:26,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 39 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:26,032 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 135 transitions. [2022-11-03 02:26:26,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 02:26:26,033 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:26,033 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:26,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:26,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-03 02:26:26,253 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:26,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:26,253 INFO L85 PathProgramCache]: Analyzing trace with hash -761001242, now seen corresponding path program 2 times [2022-11-03 02:26:26,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:26,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182551877] [2022-11-03 02:26:26,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:26,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:26,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:26,450 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:26,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:26,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182551877] [2022-11-03 02:26:26,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182551877] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:26,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628743667] [2022-11-03 02:26:26,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:26:26,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:26,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:26,453 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:26,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:26:26,565 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:26:26,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:26:26,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:26:26,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:26,624 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:26,680 INFO L356 Elim1Store]: treesize reduction 22, result has 47.6 percent of original size [2022-11-03 02:26:26,680 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 33 [2022-11-03 02:26:27,029 INFO L356 Elim1Store]: treesize reduction 12, result has 58.6 percent of original size [2022-11-03 02:26:27,031 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 45 [2022-11-03 02:26:27,177 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:26:27,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:27,574 INFO L356 Elim1Store]: treesize reduction 12, result has 67.6 percent of original size [2022-11-03 02:26:27,574 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 459 treesize of output 379 [2022-11-03 02:26:27,593 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:27,594 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 246 treesize of output 234 [2022-11-03 02:26:27,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:26:27,630 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:26:27,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2022-11-03 02:26:27,804 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:27,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 217 [2022-11-03 02:26:28,233 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:26:28,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628743667] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:28,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501715381] [2022-11-03 02:26:28,235 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:26:28,235 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:28,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:28,236 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:28,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:28,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:28,269 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:28,295 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:28,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:28,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:28,412 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:26:28,458 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:28,507 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:28,562 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:28,563 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:28,885 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:33,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5501#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:33,526 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:33,526 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:33,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2022-11-03 02:26:33,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061900212] [2022-11-03 02:26:33,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:33,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-03 02:26:33,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:33,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-03 02:26:33,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1602, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:26:33,528 INFO L87 Difference]: Start difference. First operand 114 states and 135 transitions. Second operand has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:34,055 INFO L93 Difference]: Finished difference Result 152 states and 179 transitions. [2022-11-03 02:26:34,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:26:34,056 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-03 02:26:34,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:34,057 INFO L225 Difference]: With dead ends: 152 [2022-11-03 02:26:34,057 INFO L226 Difference]: Without dead ends: 152 [2022-11-03 02:26:34,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=391, Invalid=2365, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:26:34,058 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 172 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:34,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 288 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 263 Invalid, 0 Unknown, 64 Unchecked, 0.2s Time] [2022-11-03 02:26:34,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-03 02:26:34,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 137. [2022-11-03 02:26:34,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 125 states have (on average 1.392) internal successors, (174), 136 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 174 transitions. [2022-11-03 02:26:34,066 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 174 transitions. Word has length 25 [2022-11-03 02:26:34,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:34,067 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 174 transitions. [2022-11-03 02:26:34,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,067 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 174 transitions. [2022-11-03 02:26:34,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 02:26:34,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:34,068 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:34,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:34,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 02:26:34,273 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:34,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:34,273 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242575, now seen corresponding path program 1 times [2022-11-03 02:26:34,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:34,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310293045] [2022-11-03 02:26:34,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:34,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:34,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:34,358 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:26:34,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:34,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310293045] [2022-11-03 02:26:34,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310293045] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:26:34,359 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:26:34,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:26:34,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488043449] [2022-11-03 02:26:34,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:26:34,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:26:34,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:34,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:26:34,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:26:34,361 INFO L87 Difference]: Start difference. First operand 137 states and 174 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:34,421 INFO L93 Difference]: Finished difference Result 144 states and 180 transitions. [2022-11-03 02:26:34,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:26:34,422 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-03 02:26:34,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:34,423 INFO L225 Difference]: With dead ends: 144 [2022-11-03 02:26:34,423 INFO L226 Difference]: Without dead ends: 144 [2022-11-03 02:26:34,423 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:26:34,424 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 94 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:34,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 39 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:26:34,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-03 02:26:34,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 135. [2022-11-03 02:26:34,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 125 states have (on average 1.36) internal successors, (170), 134 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 170 transitions. [2022-11-03 02:26:34,434 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 170 transitions. Word has length 26 [2022-11-03 02:26:34,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:34,434 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 170 transitions. [2022-11-03 02:26:34,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:34,435 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 170 transitions. [2022-11-03 02:26:34,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-03 02:26:34,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:34,436 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:34,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-11-03 02:26:34,436 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:34,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:34,437 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242574, now seen corresponding path program 1 times [2022-11-03 02:26:34,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:34,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200678127] [2022-11-03 02:26:34,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:34,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:34,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:34,641 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:34,641 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:34,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200678127] [2022-11-03 02:26:34,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200678127] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:34,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990717012] [2022-11-03 02:26:34,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:34,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:34,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:34,643 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:34,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:26:34,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:34,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 02:26:34,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:34,856 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:34,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:35,027 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:26:35,044 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:35,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990717012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:35,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001267507] [2022-11-03 02:26:35,047 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-03 02:26:35,047 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:35,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:35,048 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:35,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:35,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:35,070 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:35,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:35,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:35,176 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:35,224 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:26:35,268 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:35,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:35,358 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:35,359 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:35,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:41,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2001267507] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:26:41,719 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:41,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [7, 7, 7] total 32 [2022-11-03 02:26:41,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42597304] [2022-11-03 02:26:41,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:26:41,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:26:41,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:41,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:26:41,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:26:41,721 INFO L87 Difference]: Start difference. First operand 135 states and 170 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:42,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:42,399 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2022-11-03 02:26:42,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 02:26:42,400 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-11-03 02:26:42,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:42,401 INFO L225 Difference]: With dead ends: 129 [2022-11-03 02:26:42,401 INFO L226 Difference]: Without dead ends: 129 [2022-11-03 02:26:42,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:26:42,402 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 161 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 426 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:42,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 124 Invalid, 426 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:26:42,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-11-03 02:26:42,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 126. [2022-11-03 02:26:42,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 116 states have (on average 1.2844827586206897) internal successors, (149), 125 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:42,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 149 transitions. [2022-11-03 02:26:42,405 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 149 transitions. Word has length 26 [2022-11-03 02:26:42,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:42,405 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 149 transitions. [2022-11-03 02:26:42,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:42,405 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 149 transitions. [2022-11-03 02:26:42,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:26:42,406 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:42,406 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:42,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:42,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 02:26:42,609 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:42,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:42,610 INFO L85 PathProgramCache]: Analyzing trace with hash 2141288174, now seen corresponding path program 3 times [2022-11-03 02:26:42,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:42,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659632037] [2022-11-03 02:26:42,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:42,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:42,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:43,645 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:43,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:43,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659632037] [2022-11-03 02:26:43,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659632037] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:43,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604487013] [2022-11-03 02:26:43,646 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:26:43,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:43,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:43,647 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:43,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:26:43,799 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:26:43,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:26:43,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-03 02:26:43,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:43,993 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:44,068 INFO L356 Elim1Store]: treesize reduction 22, result has 47.6 percent of original size [2022-11-03 02:26:44,069 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 33 [2022-11-03 02:26:44,368 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:26:44,372 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:44,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:46,585 WARN L833 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int) (v_ArrVal_602 Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) v_ArrVal_602))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0))))) is different from false [2022-11-03 02:26:46,615 INFO L356 Elim1Store]: treesize reduction 14, result has 65.9 percent of original size [2022-11-03 02:26:46,615 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 173 treesize of output 176 [2022-11-03 02:26:46,631 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:46,631 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 45 [2022-11-03 02:26:46,645 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2022-11-03 02:26:46,835 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:26:46,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 59 [2022-11-03 02:26:47,132 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:26:47,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604487013] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:47,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1640063350] [2022-11-03 02:26:47,134 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:26:47,134 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:47,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:47,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:47,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:47,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:47,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:47,193 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:26:47,233 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:47,255 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:47,291 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:26:47,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:47,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:47,433 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:47,433 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:47,795 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:52,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6757#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:52,850 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:52,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:26:52,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 34 [2022-11-03 02:26:52,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058580813] [2022-11-03 02:26:52,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:52,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 02:26:52,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:52,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 02:26:52,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=2351, Unknown=1, NotChecked=98, Total=2652 [2022-11-03 02:26:52,853 INFO L87 Difference]: Start difference. First operand 126 states and 149 transitions. Second operand has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:55,168 WARN L833 $PredicateComparison]: unable to prove that (and (= 0 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) (< 1 |c_ULTIMATE.start_main_~length1~0#1|) (<= |c_ULTIMATE.start_main_~length1~0#1| 2) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length1~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0))) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int) (v_ArrVal_602 Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) v_ArrVal_602))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0)))))) is different from false [2022-11-03 02:26:55,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:55,864 INFO L93 Difference]: Finished difference Result 226 states and 267 transitions. [2022-11-03 02:26:55,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:26:55,865 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-03 02:26:55,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:55,866 INFO L225 Difference]: With dead ends: 226 [2022-11-03 02:26:55,866 INFO L226 Difference]: Without dead ends: 206 [2022-11-03 02:26:55,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=275, Invalid=3153, Unknown=2, NotChecked=230, Total=3660 [2022-11-03 02:26:55,868 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 100 mSDsluCounter, 1514 mSDsCounter, 0 mSdLazyCounter, 834 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 1312 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 834 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 231 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:55,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 1312 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 834 Invalid, 0 Unknown, 231 Unchecked, 0.6s Time] [2022-11-03 02:26:55,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-11-03 02:26:55,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 157. [2022-11-03 02:26:55,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 147 states have (on average 1.251700680272109) internal successors, (184), 156 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:55,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 184 transitions. [2022-11-03 02:26:55,873 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 184 transitions. Word has length 29 [2022-11-03 02:26:55,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:55,873 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 184 transitions. [2022-11-03 02:26:55,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:26:55,874 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 184 transitions. [2022-11-03 02:26:55,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 02:26:55,874 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:55,875 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:55,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:56,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 02:26:56,089 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:26:56,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:56,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1537708518, now seen corresponding path program 1 times [2022-11-03 02:26:56,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:56,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675874622] [2022-11-03 02:26:56,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:56,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:56,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:56,340 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:56,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675874622] [2022-11-03 02:26:56,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675874622] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:56,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432944248] [2022-11-03 02:26:56,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:56,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:56,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:56,342 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:56,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:26:56,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:56,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 02:26:56,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:56,540 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:56,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:56,725 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:26:56,741 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:26:56,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432944248] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:56,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1040789037] [2022-11-03 02:26:56,743 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:26:56,744 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:56,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:56,744 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:56,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:56,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:26:56,769 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:26:56,807 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:56,837 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:56,862 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:56,902 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:26:56,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:56,995 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:26:57,051 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:26:57,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:26:57,433 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:01,262 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7360#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:01,262 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:01,262 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:01,262 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-11-03 02:27:01,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22189566] [2022-11-03 02:27:01,263 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:01,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:27:01,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:01,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:27:01,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2022-11-03 02:27:01,264 INFO L87 Difference]: Start difference. First operand 157 states and 184 transitions. Second operand has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 15 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:01,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:01,666 INFO L93 Difference]: Finished difference Result 188 states and 219 transitions. [2022-11-03 02:27:01,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:27:01,666 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 15 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-03 02:27:01,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:01,668 INFO L225 Difference]: With dead ends: 188 [2022-11-03 02:27:01,668 INFO L226 Difference]: Without dead ends: 188 [2022-11-03 02:27:01,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=213, Invalid=1193, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 02:27:01,669 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 330 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 330 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:01,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [330 Valid, 198 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 352 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:27:01,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2022-11-03 02:27:01,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 173. [2022-11-03 02:27:01,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.3067484662576687) internal successors, (213), 172 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:01,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 213 transitions. [2022-11-03 02:27:01,674 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 213 transitions. Word has length 29 [2022-11-03 02:27:01,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:01,674 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 213 transitions. [2022-11-03 02:27:01,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 15 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:01,675 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 213 transitions. [2022-11-03 02:27:01,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:27:01,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:01,675 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:01,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:01,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 02:27:01,893 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:01,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:01,894 INFO L85 PathProgramCache]: Analyzing trace with hash 424283250, now seen corresponding path program 1 times [2022-11-03 02:27:01,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:01,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587372284] [2022-11-03 02:27:01,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:01,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:01,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:02,149 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:02,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:02,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587372284] [2022-11-03 02:27:02,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587372284] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:02,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700311527] [2022-11-03 02:27:02,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:02,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:02,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:02,151 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:02,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:27:02,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:02,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 02:27:02,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:02,364 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:02,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:02,548 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:27:02,565 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:02,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700311527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:02,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [41121485] [2022-11-03 02:27:02,567 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-03 02:27:02,567 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:02,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:02,568 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:02,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:02,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:02,597 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:02,626 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:02,660 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:02,687 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:27:02,745 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:27:02,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:27:02,806 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:02,835 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:02,884 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:02,885 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:03,127 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:08,669 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7940#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:08,669 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:08,669 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:08,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2022-11-03 02:27:08,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931703004] [2022-11-03 02:27:08,670 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:08,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:27:08,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:08,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:27:08,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:27:08,671 INFO L87 Difference]: Start difference. First operand 173 states and 213 transitions. Second operand has 16 states, 15 states have (on average 3.4) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:09,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:09,173 INFO L93 Difference]: Finished difference Result 214 states and 248 transitions. [2022-11-03 02:27:09,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:27:09,174 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-03 02:27:09,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:09,175 INFO L225 Difference]: With dead ends: 214 [2022-11-03 02:27:09,175 INFO L226 Difference]: Without dead ends: 214 [2022-11-03 02:27:09,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=253, Invalid=1469, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:27:09,176 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 278 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:09,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [278 Valid, 223 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:27:09,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-11-03 02:27:09,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 173. [2022-11-03 02:27:09,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 164 states have (on average 1.2926829268292683) internal successors, (212), 172 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:09,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 212 transitions. [2022-11-03 02:27:09,181 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 212 transitions. Word has length 30 [2022-11-03 02:27:09,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:09,182 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 212 transitions. [2022-11-03 02:27:09,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:09,182 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 212 transitions. [2022-11-03 02:27:09,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:27:09,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:09,183 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:09,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:09,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 02:27:09,397 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:09,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:09,397 INFO L85 PathProgramCache]: Analyzing trace with hash 2084865842, now seen corresponding path program 4 times [2022-11-03 02:27:09,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:09,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300845498] [2022-11-03 02:27:09,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:09,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:09,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:09,692 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:09,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:09,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300845498] [2022-11-03 02:27:09,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300845498] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:09,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247106323] [2022-11-03 02:27:09,693 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:27:09,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:09,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:09,694 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:09,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:27:09,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:09,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-03 02:27:09,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:09,959 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:09,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:10,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:27:10,193 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:10,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247106323] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:10,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70145839] [2022-11-03 02:27:10,195 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:27:10,195 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:10,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:10,196 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:10,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:10,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:10,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:10,252 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:10,285 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:10,306 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:27:10,372 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:27:10,372 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:27:10,419 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:10,461 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:10,510 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:10,510 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:10,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:15,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8561#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:15,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:15,966 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:15,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2022-11-03 02:27:15,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451569682] [2022-11-03 02:27:15,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:15,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:27:15,967 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:15,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:27:15,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1081, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 02:27:15,968 INFO L87 Difference]: Start difference. First operand 173 states and 212 transitions. Second operand has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:16,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:16,666 INFO L93 Difference]: Finished difference Result 273 states and 332 transitions. [2022-11-03 02:27:16,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:27:16,667 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:27:16,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:16,668 INFO L225 Difference]: With dead ends: 273 [2022-11-03 02:27:16,669 INFO L226 Difference]: Without dead ends: 273 [2022-11-03 02:27:16,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=290, Invalid=1780, Unknown=0, NotChecked=0, Total=2070 [2022-11-03 02:27:16,670 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 257 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 735 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:16,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 564 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 735 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:27:16,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2022-11-03 02:27:16,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 215. [2022-11-03 02:27:16,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 206 states have (on average 1.3349514563106797) internal successors, (275), 214 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:16,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 275 transitions. [2022-11-03 02:27:16,676 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 275 transitions. Word has length 31 [2022-11-03 02:27:16,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:16,676 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 275 transitions. [2022-11-03 02:27:16,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:16,677 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 275 transitions. [2022-11-03 02:27:16,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:27:16,677 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:16,678 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:16,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-03 02:27:16,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:16,893 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:16,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:16,893 INFO L85 PathProgramCache]: Analyzing trace with hash 267880938, now seen corresponding path program 1 times [2022-11-03 02:27:16,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:16,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878123881] [2022-11-03 02:27:16,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:16,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:16,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:17,010 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:27:17,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:17,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878123881] [2022-11-03 02:27:17,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878123881] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:27:17,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:27:17,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:27:17,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077020826] [2022-11-03 02:27:17,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:27:17,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:27:17,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:17,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:27:17,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:27:17,013 INFO L87 Difference]: Start difference. First operand 215 states and 275 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:17,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:17,113 INFO L93 Difference]: Finished difference Result 227 states and 287 transitions. [2022-11-03 02:27:17,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:27:17,113 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:27:17,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:17,114 INFO L225 Difference]: With dead ends: 227 [2022-11-03 02:27:17,114 INFO L226 Difference]: Without dead ends: 227 [2022-11-03 02:27:17,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:27:17,115 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 91 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:17,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 68 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:27:17,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-11-03 02:27:17,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 214. [2022-11-03 02:27:17,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 206 states have (on average 1.3203883495145632) internal successors, (272), 213 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:17,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 272 transitions. [2022-11-03 02:27:17,120 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 272 transitions. Word has length 31 [2022-11-03 02:27:17,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:17,120 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 272 transitions. [2022-11-03 02:27:17,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:17,120 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 272 transitions. [2022-11-03 02:27:17,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-03 02:27:17,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:17,122 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:17,123 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-11-03 02:27:17,123 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:17,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:17,123 INFO L85 PathProgramCache]: Analyzing trace with hash 267880939, now seen corresponding path program 1 times [2022-11-03 02:27:17,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:17,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584296531] [2022-11-03 02:27:17,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:17,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:17,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:17,447 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:17,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:17,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584296531] [2022-11-03 02:27:17,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584296531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:17,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659529559] [2022-11-03 02:27:17,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:17,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:17,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:17,449 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:17,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:27:17,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:17,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-03 02:27:17,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:17,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:17,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:17,875 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:27:17,911 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:17,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659529559] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:17,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [223863908] [2022-11-03 02:27:17,912 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-03 02:27:17,912 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:17,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:17,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:17,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:17,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:17,942 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:17,963 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:17,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:18,020 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:18,070 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:27:18,120 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:18,153 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:18,208 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:18,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:18,492 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:23,038 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9738#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrncmp_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (<= (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_#t~post5#1.base|))) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s2#1.base| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#t~post5#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1) |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:23,039 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:23,039 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:23,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-11-03 02:27:23,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183159443] [2022-11-03 02:27:23,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:23,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:27:23,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:23,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:27:23,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1144, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 02:27:23,040 INFO L87 Difference]: Start difference. First operand 214 states and 272 transitions. Second operand has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:23,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:23,745 INFO L93 Difference]: Finished difference Result 371 states and 469 transitions. [2022-11-03 02:27:23,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:27:23,746 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-03 02:27:23,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:23,747 INFO L225 Difference]: With dead ends: 371 [2022-11-03 02:27:23,747 INFO L226 Difference]: Without dead ends: 371 [2022-11-03 02:27:23,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=381, Invalid=2069, Unknown=0, NotChecked=0, Total=2450 [2022-11-03 02:27:23,749 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 364 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:23,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [364 Valid, 315 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:27:23,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-03 02:27:23,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 290. [2022-11-03 02:27:23,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 282 states have (on average 1.3971631205673758) internal successors, (394), 289 states have internal predecessors, (394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:23,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 394 transitions. [2022-11-03 02:27:23,758 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 394 transitions. Word has length 31 [2022-11-03 02:27:23,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:23,758 INFO L495 AbstractCegarLoop]: Abstraction has 290 states and 394 transitions. [2022-11-03 02:27:23,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.3333333333333335) internal successors, (60), 19 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:23,759 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 394 transitions. [2022-11-03 02:27:23,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 02:27:23,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:23,759 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:23,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:23,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:23,973 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:23,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:23,973 INFO L85 PathProgramCache]: Analyzing trace with hash 206291110, now seen corresponding path program 1 times [2022-11-03 02:27:23,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:23,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642706485] [2022-11-03 02:27:23,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:23,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:23,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:24,287 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:24,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:24,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642706485] [2022-11-03 02:27:24,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642706485] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:24,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237407074] [2022-11-03 02:27:24,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:24,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:24,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:24,289 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:24,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:27:24,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:24,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 02:27:24,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:24,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:24,748 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:27:24,776 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:27:24,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237407074] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:24,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1630891746] [2022-11-03 02:27:24,779 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-03 02:27:24,779 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:24,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:24,779 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:24,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:24,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:24,800 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:24,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:24,874 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:24,914 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:27:24,974 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:27:24,975 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:27:25,029 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:25,066 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:25,125 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:25,125 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:25,556 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:31,108 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10648#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:31,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:31,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:31,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2022-11-03 02:27:31,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406728481] [2022-11-03 02:27:31,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:31,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 02:27:31,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:31,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 02:27:31,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1274, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:27:31,110 INFO L87 Difference]: Start difference. First operand 290 states and 394 transitions. Second operand has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:31,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:31,820 INFO L93 Difference]: Finished difference Result 441 states and 568 transitions. [2022-11-03 02:27:31,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 02:27:31,820 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-03 02:27:31,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:31,822 INFO L225 Difference]: With dead ends: 441 [2022-11-03 02:27:31,822 INFO L226 Difference]: Without dead ends: 441 [2022-11-03 02:27:31,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=349, Invalid=2201, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:27:31,824 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 498 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 498 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:31,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [498 Valid, 443 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:27:31,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-03 02:27:31,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 282. [2022-11-03 02:27:31,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 274 states have (on average 1.3941605839416058) internal successors, (382), 281 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:31,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 382 transitions. [2022-11-03 02:27:31,833 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 382 transitions. Word has length 32 [2022-11-03 02:27:31,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:31,833 INFO L495 AbstractCegarLoop]: Abstraction has 282 states and 382 transitions. [2022-11-03 02:27:31,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:31,834 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 382 transitions. [2022-11-03 02:27:31,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 02:27:31,834 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:31,834 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:31,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:32,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:32,045 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:32,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:32,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1021448723, now seen corresponding path program 6 times [2022-11-03 02:27:32,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:32,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023772744] [2022-11-03 02:27:32,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:32,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:32,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:33,142 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:27:33,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023772744] [2022-11-03 02:27:33,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023772744] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:33,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535453947] [2022-11-03 02:27:33,142 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:27:33,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:33,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:33,144 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:33,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:27:33,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:27:33,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:27:33,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:27:33,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:33,593 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:36,651 INFO L356 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2022-11-03 02:27:36,651 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 38 treesize of output 26 [2022-11-03 02:27:36,696 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 21 proven. 32 refuted. 4 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:27:36,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:37,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2022-11-03 02:27:37,253 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:27:37,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 34 [2022-11-03 02:27:37,624 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 31 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:27:37,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535453947] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:37,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1971395553] [2022-11-03 02:27:37,626 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:27:37,626 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:37,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:37,627 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:37,627 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:37,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:37,657 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:37,684 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,722 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:27:37,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,871 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,937 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:37,982 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:37,982 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:38,186 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:41,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11649#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:41,711 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:41,711 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:41,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 48 [2022-11-03 02:27:41,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394860102] [2022-11-03 02:27:41,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:41,712 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-03 02:27:41,712 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:41,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-03 02:27:41,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=3101, Unknown=5, NotChecked=0, Total=3306 [2022-11-03 02:27:41,714 INFO L87 Difference]: Start difference. First operand 282 states and 382 transitions. Second operand has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 48 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:49,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:49,975 INFO L93 Difference]: Finished difference Result 429 states and 575 transitions. [2022-11-03 02:27:49,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-03 02:27:49,976 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 48 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-03 02:27:49,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:49,978 INFO L225 Difference]: With dead ends: 429 [2022-11-03 02:27:49,978 INFO L226 Difference]: Without dead ends: 417 [2022-11-03 02:27:49,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1481 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=530, Invalid=6433, Unknown=9, NotChecked=0, Total=6972 [2022-11-03 02:27:49,980 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 478 mSDsluCounter, 1440 mSDsCounter, 0 mSdLazyCounter, 1208 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 478 SdHoareTripleChecker+Valid, 1376 SdHoareTripleChecker+Invalid, 1465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 217 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:49,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [478 Valid, 1376 Invalid, 1465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1208 Invalid, 0 Unknown, 217 Unchecked, 0.9s Time] [2022-11-03 02:27:49,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2022-11-03 02:27:49,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 304. [2022-11-03 02:27:49,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 296 states have (on average 1.3817567567567568) internal successors, (409), 303 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:49,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 409 transitions. [2022-11-03 02:27:49,989 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 409 transitions. Word has length 32 [2022-11-03 02:27:49,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:49,989 INFO L495 AbstractCegarLoop]: Abstraction has 304 states and 409 transitions. [2022-11-03 02:27:49,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 48 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:49,990 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 409 transitions. [2022-11-03 02:27:49,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 02:27:49,990 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:49,991 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:50,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:50,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-03 02:27:50,197 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:50,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:50,197 INFO L85 PathProgramCache]: Analyzing trace with hash -264452917, now seen corresponding path program 1 times [2022-11-03 02:27:50,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:50,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090098507] [2022-11-03 02:27:50,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:50,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:50,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:50,299 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:27:50,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:50,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090098507] [2022-11-03 02:27:50,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090098507] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:27:50,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:27:50,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:27:50,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547562297] [2022-11-03 02:27:50,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:27:50,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:27:50,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:50,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:27:50,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:27:50,301 INFO L87 Difference]: Start difference. First operand 304 states and 409 transitions. Second operand has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:50,403 INFO L93 Difference]: Finished difference Result 329 states and 432 transitions. [2022-11-03 02:27:50,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:27:50,403 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-03 02:27:50,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:50,404 INFO L225 Difference]: With dead ends: 329 [2022-11-03 02:27:50,405 INFO L226 Difference]: Without dead ends: 329 [2022-11-03 02:27:50,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:27:50,405 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 84 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:50,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 63 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:27:50,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-11-03 02:27:50,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 303. [2022-11-03 02:27:50,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 296 states have (on average 1.3547297297297298) internal successors, (401), 302 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 401 transitions. [2022-11-03 02:27:50,413 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 401 transitions. Word has length 33 [2022-11-03 02:27:50,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:50,413 INFO L495 AbstractCegarLoop]: Abstraction has 303 states and 401 transitions. [2022-11-03 02:27:50,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,414 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 401 transitions. [2022-11-03 02:27:50,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 02:27:50,414 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:50,414 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:50,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-11-03 02:27:50,415 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:50,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:50,415 INFO L85 PathProgramCache]: Analyzing trace with hash -264452916, now seen corresponding path program 1 times [2022-11-03 02:27:50,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:50,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861399636] [2022-11-03 02:27:50,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:50,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:50,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:50,609 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:27:50,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:50,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861399636] [2022-11-03 02:27:50,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861399636] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:27:50,609 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:27:50,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 02:27:50,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280933529] [2022-11-03 02:27:50,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:27:50,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:27:50,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:50,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:27:50,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:27:50,611 INFO L87 Difference]: Start difference. First operand 303 states and 401 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:50,803 INFO L93 Difference]: Finished difference Result 365 states and 465 transitions. [2022-11-03 02:27:50,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:27:50,803 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-03 02:27:50,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:50,805 INFO L225 Difference]: With dead ends: 365 [2022-11-03 02:27:50,805 INFO L226 Difference]: Without dead ends: 365 [2022-11-03 02:27:50,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2022-11-03 02:27:50,806 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 64 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:50,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 120 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:27:50,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2022-11-03 02:27:50,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 302. [2022-11-03 02:27:50,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 296 states have (on average 1.3277027027027026) internal successors, (393), 301 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 393 transitions. [2022-11-03 02:27:50,814 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 393 transitions. Word has length 33 [2022-11-03 02:27:50,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:50,814 INFO L495 AbstractCegarLoop]: Abstraction has 302 states and 393 transitions. [2022-11-03 02:27:50,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:50,814 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 393 transitions. [2022-11-03 02:27:50,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 02:27:50,815 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:50,815 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:50,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-11-03 02:27:50,816 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:50,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1032420846, now seen corresponding path program 2 times [2022-11-03 02:27:50,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:50,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617536227] [2022-11-03 02:27:50,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:50,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:50,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:51,414 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:51,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:51,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617536227] [2022-11-03 02:27:51,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617536227] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:51,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474892486] [2022-11-03 02:27:51,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:27:51,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:51,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:51,416 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:51,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 02:27:51,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:27:51,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:27:51,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 02:27:51,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:51,712 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:27:51,896 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:51,947 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:27:52,181 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:27:52,181 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:27:52,184 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:52,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:52,293 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_937 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_937) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2022-11-03 02:27:52,316 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:27:52,317 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:27:52,324 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:27:52,324 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:27:52,526 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:27:52,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474892486] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:52,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [556981308] [2022-11-03 02:27:52,528 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:27:52,528 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:52,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:52,528 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:52,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:52,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:52,551 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:52,585 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:52,614 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:52,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:52,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:27:52,740 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:52,775 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:52,831 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:52,831 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:27:53,203 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:57,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13996#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:27:57,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:57,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:27:57,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 27 [2022-11-03 02:27:57,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239084547] [2022-11-03 02:27:57,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:57,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 02:27:57,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:57,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 02:27:57,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1576, Unknown=1, NotChecked=80, Total=1806 [2022-11-03 02:27:57,388 INFO L87 Difference]: Start difference. First operand 302 states and 393 transitions. Second operand has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:58,289 INFO L93 Difference]: Finished difference Result 339 states and 436 transitions. [2022-11-03 02:27:58,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:27:58,289 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-03 02:27:58,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:58,291 INFO L225 Difference]: With dead ends: 339 [2022-11-03 02:27:58,291 INFO L226 Difference]: Without dead ends: 332 [2022-11-03 02:27:58,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 51 ConstructedPredicates, 1 IntricatePredicates, 3 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=223, Invalid=2432, Unknown=1, NotChecked=100, Total=2756 [2022-11-03 02:27:58,292 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 100 mSDsluCounter, 794 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 679 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:58,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 679 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 608 Invalid, 0 Unknown, 138 Unchecked, 0.4s Time] [2022-11-03 02:27:58,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-11-03 02:27:58,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 325. [2022-11-03 02:27:58,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 319 states have (on average 1.322884012539185) internal successors, (422), 324 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 422 transitions. [2022-11-03 02:27:58,299 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 422 transitions. Word has length 33 [2022-11-03 02:27:58,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:58,299 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 422 transitions. [2022-11-03 02:27:58,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,299 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 422 transitions. [2022-11-03 02:27:58,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 02:27:58,300 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:58,300 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:58,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:58,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:58,525 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:58,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:58,525 INFO L85 PathProgramCache]: Analyzing trace with hash 391886083, now seen corresponding path program 1 times [2022-11-03 02:27:58,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:58,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072179528] [2022-11-03 02:27:58,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:58,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:58,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:58,591 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:27:58,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:58,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072179528] [2022-11-03 02:27:58,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072179528] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:27:58,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:27:58,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:27:58,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172359703] [2022-11-03 02:27:58,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:27:58,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:27:58,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:58,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:27:58,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:27:58,595 INFO L87 Difference]: Start difference. First operand 325 states and 422 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:58,679 INFO L93 Difference]: Finished difference Result 360 states and 455 transitions. [2022-11-03 02:27:58,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:27:58,679 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 02:27:58,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:58,680 INFO L225 Difference]: With dead ends: 360 [2022-11-03 02:27:58,680 INFO L226 Difference]: Without dead ends: 360 [2022-11-03 02:27:58,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:27:58,681 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 22 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:58,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 113 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:27:58,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2022-11-03 02:27:58,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 324. [2022-11-03 02:27:58,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 319 states have (on average 1.3040752351097178) internal successors, (416), 323 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 416 transitions. [2022-11-03 02:27:58,688 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 416 transitions. Word has length 34 [2022-11-03 02:27:58,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:58,689 INFO L495 AbstractCegarLoop]: Abstraction has 324 states and 416 transitions. [2022-11-03 02:27:58,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:27:58,689 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 416 transitions. [2022-11-03 02:27:58,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 02:27:58,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:58,690 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:58,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-11-03 02:27:58,691 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:27:58,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:58,691 INFO L85 PathProgramCache]: Analyzing trace with hash 391886084, now seen corresponding path program 1 times [2022-11-03 02:27:58,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:58,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438044269] [2022-11-03 02:27:58,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:58,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:58,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:59,106 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:59,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:59,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438044269] [2022-11-03 02:27:59,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438044269] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:27:59,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820297064] [2022-11-03 02:27:59,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:59,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:59,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:59,108 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:59,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 02:27:59,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:59,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 02:27:59,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:59,426 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:59,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:59,627 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:27:59,685 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:27:59,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820297064] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:59,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1476422761] [2022-11-03 02:27:59,687 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:27:59,687 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:59,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:59,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:59,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:59,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:27:59,723 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:27:59,746 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:27:59,781 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:59,807 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:59,860 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:27:59,913 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:59,948 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:27:59,991 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:27:59,992 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:28:00,254 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:06,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1476422761] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:28:06,321 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:06,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [11, 10, 10] total 44 [2022-11-03 02:28:06,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035945296] [2022-11-03 02:28:06,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:28:06,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:28:06,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:06,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:28:06,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1732, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:28:06,323 INFO L87 Difference]: Start difference. First operand 324 states and 416 transitions. Second operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:13,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:13,046 INFO L93 Difference]: Finished difference Result 341 states and 429 transitions. [2022-11-03 02:28:13,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:28:13,047 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 02:28:13,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:13,048 INFO L225 Difference]: With dead ends: 341 [2022-11-03 02:28:13,049 INFO L226 Difference]: Without dead ends: 339 [2022-11-03 02:28:13,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=417, Invalid=2775, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:28:13,050 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 107 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:13,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 198 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:28:13,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2022-11-03 02:28:13,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 326. [2022-11-03 02:28:13,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 321 states have (on average 1.2990654205607477) internal successors, (417), 325 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:13,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 417 transitions. [2022-11-03 02:28:13,057 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 417 transitions. Word has length 34 [2022-11-03 02:28:13,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:13,057 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 417 transitions. [2022-11-03 02:28:13,057 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:13,058 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 417 transitions. [2022-11-03 02:28:13,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 02:28:13,058 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:13,059 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:13,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:13,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-03 02:28:13,273 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:28:13,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:13,273 INFO L85 PathProgramCache]: Analyzing trace with hash 2137880329, now seen corresponding path program 7 times [2022-11-03 02:28:13,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:13,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533711595] [2022-11-03 02:28:13,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:13,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:13,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:14,334 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:28:14,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:14,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533711595] [2022-11-03 02:28:14,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533711595] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:14,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024388688] [2022-11-03 02:28:14,335 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:28:14,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:14,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:14,336 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:14,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 02:28:14,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:14,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-03 02:28:14,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:14,888 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:15,508 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:28:15,511 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:28:15,511 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:28:15,557 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:28:15,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:15,948 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-03 02:28:15,951 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2022-11-03 02:28:16,736 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 15 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:28:16,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024388688] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:16,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055000328] [2022-11-03 02:28:16,738 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:28:16,738 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:16,738 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:16,738 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:16,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:16,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:16,773 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:28:16,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:16,836 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:16,856 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:16,905 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:16,955 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:16,992 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:17,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:17,066 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:17,103 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:28:17,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:28:17,415 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:21,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16576#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 2 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:21,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:21,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:21,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 55 [2022-11-03 02:28:21,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590178078] [2022-11-03 02:28:21,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:21,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 02:28:21,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:21,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 02:28:21,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=4201, Unknown=0, NotChecked=0, Total=4422 [2022-11-03 02:28:21,617 INFO L87 Difference]: Start difference. First operand 326 states and 417 transitions. Second operand has 56 states, 56 states have (on average 1.6964285714285714) internal successors, (95), 55 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:30,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:30,272 INFO L93 Difference]: Finished difference Result 1508 states and 1980 transitions. [2022-11-03 02:28:30,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-03 02:28:30,277 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.6964285714285714) internal successors, (95), 55 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-11-03 02:28:30,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:30,281 INFO L225 Difference]: With dead ends: 1508 [2022-11-03 02:28:30,282 INFO L226 Difference]: Without dead ends: 1494 [2022-11-03 02:28:30,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2164 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=753, Invalid=11019, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:28:30,284 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 3376 mSDsluCounter, 6397 mSDsCounter, 0 mSdLazyCounter, 5677 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3376 SdHoareTripleChecker+Valid, 6194 SdHoareTripleChecker+Invalid, 6586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 5677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 774 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:30,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3376 Valid, 6194 Invalid, 6586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 5677 Invalid, 0 Unknown, 774 Unchecked, 3.7s Time] [2022-11-03 02:28:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1494 states. [2022-11-03 02:28:30,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1494 to 348. [2022-11-03 02:28:30,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 343 states have (on average 1.2944606413994169) internal successors, (444), 347 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:30,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 444 transitions. [2022-11-03 02:28:30,298 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 444 transitions. Word has length 34 [2022-11-03 02:28:30,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:30,299 INFO L495 AbstractCegarLoop]: Abstraction has 348 states and 444 transitions. [2022-11-03 02:28:30,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.6964285714285714) internal successors, (95), 55 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:30,299 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 444 transitions. [2022-11-03 02:28:30,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:28:30,300 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:30,300 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:30,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:30,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-03 02:28:30,524 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:28:30,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:30,525 INFO L85 PathProgramCache]: Analyzing trace with hash 819129658, now seen corresponding path program 5 times [2022-11-03 02:28:30,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:30,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860566548] [2022-11-03 02:28:30,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:30,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:30,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:32,130 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:28:32,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:32,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860566548] [2022-11-03 02:28:32,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860566548] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:32,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827336806] [2022-11-03 02:28:32,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:28:32,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:32,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:32,132 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:32,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 02:28:32,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:28:32,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:32,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-03 02:28:32,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:32,294 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:28:32,599 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:32,668 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:28:32,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:28:32,870 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:28:32,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:32,947 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1084 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1084) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 02:28:32,952 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:28:32,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:28:32,959 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:28:32,959 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:28:32,962 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-03 02:28:33,276 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:28:33,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827336806] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:33,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37258029] [2022-11-03 02:28:33,278 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:28:33,278 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:33,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:33,278 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:33,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:33,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:33,308 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:28:33,347 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:28:33,379 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:33,403 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:33,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:28:33,489 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:33,519 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:33,572 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:28:33,572 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:28:33,885 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:39,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18768#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:39,690 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:39,690 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:39,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 36 [2022-11-03 02:28:39,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951663289] [2022-11-03 02:28:39,690 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:39,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-03 02:28:39,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:39,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-03 02:28:39,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=2567, Unknown=1, NotChecked=102, Total=2862 [2022-11-03 02:28:39,692 INFO L87 Difference]: Start difference. First operand 348 states and 444 transitions. Second operand has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:43,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:43,486 INFO L93 Difference]: Finished difference Result 534 states and 671 transitions. [2022-11-03 02:28:43,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:28:43,486 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-11-03 02:28:43,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:43,489 INFO L225 Difference]: With dead ends: 534 [2022-11-03 02:28:43,489 INFO L226 Difference]: Without dead ends: 520 [2022-11-03 02:28:43,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1112 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=355, Invalid=4477, Unknown=2, NotChecked=136, Total=4970 [2022-11-03 02:28:43,492 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 267 mSDsluCounter, 1427 mSDsCounter, 0 mSdLazyCounter, 1801 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 1270 SdHoareTripleChecker+Invalid, 2042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1801 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:43,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 1270 Invalid, 2042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1801 Invalid, 0 Unknown, 218 Unchecked, 1.4s Time] [2022-11-03 02:28:43,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-11-03 02:28:43,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 485. [2022-11-03 02:28:43,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 480 states have (on average 1.2854166666666667) internal successors, (617), 484 states have internal predecessors, (617), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:43,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 617 transitions. [2022-11-03 02:28:43,505 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 617 transitions. Word has length 35 [2022-11-03 02:28:43,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:43,506 INFO L495 AbstractCegarLoop]: Abstraction has 485 states and 617 transitions. [2022-11-03 02:28:43,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.135135135135135) internal successors, (79), 36 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:43,506 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 617 transitions. [2022-11-03 02:28:43,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 02:28:43,507 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:43,507 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:43,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:43,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:43,721 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:28:43,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:43,721 INFO L85 PathProgramCache]: Analyzing trace with hash -1925173448, now seen corresponding path program 1 times [2022-11-03 02:28:43,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:43,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954130547] [2022-11-03 02:28:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:43,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:44,076 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 02:28:44,077 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:44,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954130547] [2022-11-03 02:28:44,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954130547] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:44,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91193557] [2022-11-03 02:28:44,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:44,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:44,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:44,078 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:44,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 02:28:44,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:44,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 02:28:44,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:44,364 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 02:28:44,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:44,556 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:28:44,577 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 02:28:44,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91193557] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:44,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707521512] [2022-11-03 02:28:44,579 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:44,579 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:44,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:44,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:44,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:44,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:28:44,616 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:28:44,640 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:28:44,673 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:44,698 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:44,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:28:44,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:44,829 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:44,874 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:28:44,875 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:28:45,185 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:52,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [707521512] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:28:52,709 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:28:52,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [10, 9, 9] total 41 [2022-11-03 02:28:52,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029401917] [2022-11-03 02:28:52,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:28:52,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 02:28:52,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:52,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 02:28:52,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1451, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:28:52,711 INFO L87 Difference]: Start difference. First operand 485 states and 617 transitions. Second operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:58,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:58,804 INFO L93 Difference]: Finished difference Result 626 states and 786 transitions. [2022-11-03 02:28:58,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:28:58,805 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-03 02:28:58,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:58,807 INFO L225 Difference]: With dead ends: 626 [2022-11-03 02:28:58,807 INFO L226 Difference]: Without dead ends: 624 [2022-11-03 02:28:58,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=428, Invalid=2224, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 02:28:58,808 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 223 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:58,808 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 241 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:28:58,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2022-11-03 02:28:58,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 556. [2022-11-03 02:28:58,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 556 states, 551 states have (on average 1.2994555353901995) internal successors, (716), 555 states have internal predecessors, (716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:58,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 556 states to 556 states and 716 transitions. [2022-11-03 02:28:58,821 INFO L78 Accepts]: Start accepts. Automaton has 556 states and 716 transitions. Word has length 36 [2022-11-03 02:28:58,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:58,821 INFO L495 AbstractCegarLoop]: Abstraction has 556 states and 716 transitions. [2022-11-03 02:28:58,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:28:58,822 INFO L276 IsEmpty]: Start isEmpty. Operand 556 states and 716 transitions. [2022-11-03 02:28:58,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 02:28:58,823 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:58,823 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:58,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:59,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:59,037 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:28:59,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:59,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1346682423, now seen corresponding path program 1 times [2022-11-03 02:28:59,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:59,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252175595] [2022-11-03 02:28:59,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:59,038 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:59,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:59,203 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 02:28:59,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:59,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252175595] [2022-11-03 02:28:59,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252175595] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:28:59,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132698249] [2022-11-03 02:28:59,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:59,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:59,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:59,206 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:59,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 02:28:59,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:59,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-03 02:28:59,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:59,405 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:28:59,578 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:28:59,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:29:00,077 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:29:00,077 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 17 [2022-11-03 02:29:00,106 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:29:00,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:00,379 WARN L833 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (v_ArrVal_1164 (Array Int Int))) (let ((.cse0 (select v_ArrVal_1164 (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1164) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) .cse0)) (= 0 .cse0)))) is different from false [2022-11-03 02:29:00,386 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:29:00,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 29 [2022-11-03 02:29:00,393 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:29:00,393 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 43 [2022-11-03 02:29:00,401 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:29:00,401 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 30 [2022-11-03 02:29:00,580 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 02:29:00,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132698249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:00,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [326510194] [2022-11-03 02:29:00,581 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:29:00,581 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:00,581 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:00,581 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:00,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:00,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:00,616 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:29:00,661 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:00,694 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:00,716 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:00,754 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:29:00,801 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:00,834 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:00,875 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:29:00,875 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:29:02,124 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:12,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21535#(and (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|))))' at error location [2022-11-03 02:29:12,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:12,166 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:29:12,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 16, 15] total 33 [2022-11-03 02:29:12,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296914814] [2022-11-03 02:29:12,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:12,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-03 02:29:12,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:12,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-03 02:29:12,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=2673, Unknown=1, NotChecked=104, Total=2970 [2022-11-03 02:29:12,167 INFO L87 Difference]: Start difference. First operand 556 states and 716 transitions. Second operand has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 33 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:13,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:13,080 INFO L93 Difference]: Finished difference Result 726 states and 904 transitions. [2022-11-03 02:29:13,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-03 02:29:13,080 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 33 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-03 02:29:13,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:13,084 INFO L225 Difference]: With dead ends: 726 [2022-11-03 02:29:13,084 INFO L226 Difference]: Without dead ends: 663 [2022-11-03 02:29:13,085 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 66 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1107 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=274, Invalid=4151, Unknown=1, NotChecked=130, Total=4556 [2022-11-03 02:29:13,085 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 86 mSDsluCounter, 1100 mSDsCounter, 0 mSdLazyCounter, 692 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 954 SdHoareTripleChecker+Invalid, 957 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 258 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:13,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 954 Invalid, 957 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 692 Invalid, 0 Unknown, 258 Unchecked, 0.4s Time] [2022-11-03 02:29:13,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2022-11-03 02:29:13,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 566. [2022-11-03 02:29:13,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 566 states, 561 states have (on average 1.3012477718360071) internal successors, (730), 565 states have internal predecessors, (730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:13,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 566 states to 566 states and 730 transitions. [2022-11-03 02:29:13,096 INFO L78 Accepts]: Start accepts. Automaton has 566 states and 730 transitions. Word has length 36 [2022-11-03 02:29:13,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:13,097 INFO L495 AbstractCegarLoop]: Abstraction has 566 states and 730 transitions. [2022-11-03 02:29:13,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 33 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:29:13,097 INFO L276 IsEmpty]: Start isEmpty. Operand 566 states and 730 transitions. [2022-11-03 02:29:13,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 02:29:13,098 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:13,098 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:29:13,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-11-03 02:29:13,313 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-03 02:29:13,313 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:29:13,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:13,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1286829695, now seen corresponding path program 8 times [2022-11-03 02:29:13,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:13,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538695298] [2022-11-03 02:29:13,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:13,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:13,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:29:14,004 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 6 proven. 79 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:29:14,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:14,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538695298] [2022-11-03 02:29:14,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538695298] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:29:14,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126705626] [2022-11-03 02:29:14,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:29:14,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:14,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:14,006 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:14,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 02:29:14,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 02:29:14,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:29:14,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-03 02:29:14,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:14,481 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:42,776 INFO L356 Elim1Store]: treesize reduction 8, result has 86.9 percent of original size [2022-11-03 02:29:42,776 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 34 treesize of output 67 [2022-11-03 02:29:43,043 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 17 proven. 45 refuted. 7 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 02:29:43,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:44,791 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 56 [2022-11-03 02:29:44,862 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:29:44,862 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 106 treesize of output 176 [2022-11-03 02:29:45,282 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 46 [2022-11-03 02:29:45,466 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 4 proven. 69 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-03 02:29:45,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126705626] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:45,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831425240] [2022-11-03 02:29:45,467 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 02:29:45,467 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:45,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:45,467 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:45,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:45,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:29:45,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:29:45,535 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,603 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,651 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:29:45,690 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,718 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,782 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:29:45,859 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:29:45,859 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:29:46,096 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:49,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23143#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (not (<= (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|))) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:49,638 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:49,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:29:49,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 21] total 55 [2022-11-03 02:29:49,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303060581] [2022-11-03 02:29:49,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:49,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-03 02:29:49,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:49,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-03 02:29:49,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=3831, Unknown=5, NotChecked=0, Total=4160 [2022-11-03 02:29:49,640 INFO L87 Difference]: Start difference. First operand 566 states and 730 transitions. Second operand has 55 states, 55 states have (on average 1.5454545454545454) internal successors, (85), 55 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:01,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:01,903 INFO L93 Difference]: Finished difference Result 631 states and 804 transitions. [2022-11-03 02:30:01,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-03 02:30:01,904 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.5454545454545454) internal successors, (85), 55 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-03 02:30:01,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:01,906 INFO L225 Difference]: With dead ends: 631 [2022-11-03 02:30:01,906 INFO L226 Difference]: Without dead ends: 581 [2022-11-03 02:30:01,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3423 ImplicationChecksByTransitivity, 45.1s TimeCoverageRelationStatistics Valid=1014, Invalid=10537, Unknown=5, NotChecked=0, Total=11556 [2022-11-03 02:30:01,907 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 231 mSDsluCounter, 999 mSDsCounter, 0 mSdLazyCounter, 1169 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 906 SdHoareTripleChecker+Invalid, 1540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 332 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:01,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 906 Invalid, 1540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1169 Invalid, 0 Unknown, 332 Unchecked, 0.7s Time] [2022-11-03 02:30:01,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2022-11-03 02:30:01,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 543. [2022-11-03 02:30:01,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 543 states, 539 states have (on average 1.3061224489795917) internal successors, (704), 542 states have internal predecessors, (704), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:01,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 543 states to 543 states and 704 transitions. [2022-11-03 02:30:01,916 INFO L78 Accepts]: Start accepts. Automaton has 543 states and 704 transitions. Word has length 36 [2022-11-03 02:30:01,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:01,917 INFO L495 AbstractCegarLoop]: Abstraction has 543 states and 704 transitions. [2022-11-03 02:30:01,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.5454545454545454) internal successors, (85), 55 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:01,917 INFO L276 IsEmpty]: Start isEmpty. Operand 543 states and 704 transitions. [2022-11-03 02:30:01,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-03 02:30:01,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:01,918 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:01,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:02,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-03 02:30:02,132 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:02,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:02,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1477556862, now seen corresponding path program 6 times [2022-11-03 02:30:02,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:02,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116240575] [2022-11-03 02:30:02,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:02,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:02,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:02,451 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:02,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:02,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116240575] [2022-11-03 02:30:02,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116240575] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:02,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278112828] [2022-11-03 02:30:02,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:30:02,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:02,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:02,453 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:02,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-03 02:30:02,646 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:30:02,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:02,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 02:30:02,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:02,800 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:02,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:03,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:30:03,148 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:03,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278112828] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:03,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [601247010] [2022-11-03 02:30:03,149 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:30:03,149 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:03,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:03,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:03,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:03,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:03,171 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:30:03,202 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:03,231 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:03,254 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:03,306 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:30:03,306 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:30:03,355 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:03,383 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:03,447 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:30:03,447 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:30:03,798 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:08,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24651#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:08,806 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:08,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:08,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-03 02:30:08,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783778758] [2022-11-03 02:30:08,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:08,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:30:08,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:08,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:30:08,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1291, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:30:08,807 INFO L87 Difference]: Start difference. First operand 543 states and 704 transitions. Second operand has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:09,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:09,544 INFO L93 Difference]: Finished difference Result 649 states and 838 transitions. [2022-11-03 02:30:09,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 02:30:09,545 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-11-03 02:30:09,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:09,548 INFO L225 Difference]: With dead ends: 649 [2022-11-03 02:30:09,548 INFO L226 Difference]: Without dead ends: 649 [2022-11-03 02:30:09,548 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 79 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=342, Invalid=2208, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:30:09,549 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 587 mSDsluCounter, 564 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 587 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:09,549 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [587 Valid, 550 Invalid, 701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 02:30:09,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2022-11-03 02:30:09,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 632. [2022-11-03 02:30:09,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 632 states, 628 states have (on average 1.3264331210191083) internal successors, (833), 631 states have internal predecessors, (833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:09,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 632 states to 632 states and 833 transitions. [2022-11-03 02:30:09,575 INFO L78 Accepts]: Start accepts. Automaton has 632 states and 833 transitions. Word has length 37 [2022-11-03 02:30:09,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:09,576 INFO L495 AbstractCegarLoop]: Abstraction has 632 states and 833 transitions. [2022-11-03 02:30:09,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:09,576 INFO L276 IsEmpty]: Start isEmpty. Operand 632 states and 833 transitions. [2022-11-03 02:30:09,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:30:09,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:09,577 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:09,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:09,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-03 02:30:09,793 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:09,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:09,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1440418086, now seen corresponding path program 2 times [2022-11-03 02:30:09,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:09,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326030214] [2022-11-03 02:30:09,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:09,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:09,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:10,119 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:10,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:10,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326030214] [2022-11-03 02:30:10,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326030214] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:10,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076616313] [2022-11-03 02:30:10,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:30:10,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:10,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:10,120 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:10,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-03 02:30:10,266 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-03 02:30:10,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:10,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:30:10,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:10,335 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 02:30:10,336 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:30:10,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076616313] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:30:10,336 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:30:10,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 16 [2022-11-03 02:30:10,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139516719] [2022-11-03 02:30:10,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:30:10,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:30:10,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:10,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:30:10,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:30:10,337 INFO L87 Difference]: Start difference. First operand 632 states and 833 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:10,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:10,409 INFO L93 Difference]: Finished difference Result 573 states and 717 transitions. [2022-11-03 02:30:10,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:30:10,410 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-11-03 02:30:10,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:10,412 INFO L225 Difference]: With dead ends: 573 [2022-11-03 02:30:10,412 INFO L226 Difference]: Without dead ends: 523 [2022-11-03 02:30:10,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:30:10,413 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 27 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:10,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 107 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:30:10,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2022-11-03 02:30:10,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 447. [2022-11-03 02:30:10,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 443 states have (on average 1.2934537246049662) internal successors, (573), 446 states have internal predecessors, (573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:10,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 573 transitions. [2022-11-03 02:30:10,420 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 573 transitions. Word has length 38 [2022-11-03 02:30:10,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:10,420 INFO L495 AbstractCegarLoop]: Abstraction has 447 states and 573 transitions. [2022-11-03 02:30:10,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:10,420 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 573 transitions. [2022-11-03 02:30:10,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-03 02:30:10,421 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:10,421 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:10,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:10,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:10,639 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:10,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:10,639 INFO L85 PathProgramCache]: Analyzing trace with hash 80022072, now seen corresponding path program 1 times [2022-11-03 02:30:10,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:10,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432618105] [2022-11-03 02:30:10,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:10,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:10,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:11,042 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:30:11,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:11,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432618105] [2022-11-03 02:30:11,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432618105] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:11,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293592970] [2022-11-03 02:30:11,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:11,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:11,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:11,045 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:11,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-03 02:30:11,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:11,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-03 02:30:11,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:11,442 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:30:11,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:11,713 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:30:11,774 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:30:11,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293592970] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:11,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1738961574] [2022-11-03 02:30:11,775 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:30:11,775 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:11,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:11,776 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:11,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:11,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:11,800 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:30:11,833 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:11,865 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:11,910 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:11,947 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:30:11,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:12,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:12,074 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:30:12,074 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:30:12,464 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:18,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1738961574] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:30:18,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:18,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [11, 10, 10] total 45 [2022-11-03 02:30:18,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822770635] [2022-11-03 02:30:18,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:30:18,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 02:30:18,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:18,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 02:30:18,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1804, Unknown=0, NotChecked=0, Total=2070 [2022-11-03 02:30:18,510 INFO L87 Difference]: Start difference. First operand 447 states and 573 transitions. Second operand has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:24,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:24,771 INFO L93 Difference]: Finished difference Result 505 states and 629 transitions. [2022-11-03 02:30:24,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:30:24,772 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-03 02:30:24,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:24,773 INFO L225 Difference]: With dead ends: 505 [2022-11-03 02:30:24,774 INFO L226 Difference]: Without dead ends: 494 [2022-11-03 02:30:24,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 82 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 883 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=446, Invalid=2860, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 02:30:24,775 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 87 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:24,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 144 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:30:24,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2022-11-03 02:30:24,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 444. [2022-11-03 02:30:24,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 440 states have (on average 1.290909090909091) internal successors, (568), 443 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:24,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 568 transitions. [2022-11-03 02:30:24,782 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 568 transitions. Word has length 40 [2022-11-03 02:30:24,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:24,782 INFO L495 AbstractCegarLoop]: Abstraction has 444 states and 568 transitions. [2022-11-03 02:30:24,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:24,783 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 568 transitions. [2022-11-03 02:30:24,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-03 02:30:24,784 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:24,784 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:24,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:25,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:25,001 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:25,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:25,001 INFO L85 PathProgramCache]: Analyzing trace with hash 821926534, now seen corresponding path program 7 times [2022-11-03 02:30:25,001 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:25,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707669095] [2022-11-03 02:30:25,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:25,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:25,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:26,498 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:30:26,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:26,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707669095] [2022-11-03 02:30:26,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707669095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:26,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369193546] [2022-11-03 02:30:26,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:30:26,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:26,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:26,500 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:26,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-03 02:30:26,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:26,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-03 02:30:26,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:26,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:30:27,046 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:27,113 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:30:27,792 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:30:27,794 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:30:27,795 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:30:27,840 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:27,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:28,269 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1388 (Array Int Int)) (|v_ULTIMATE.start_cstrstr_#t~post17#1.offset_148| Int)) (or (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_148|) (not (<= 0 |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_148|)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1388) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_148|)) 0))) is different from false [2022-11-03 02:30:28,278 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:30:28,278 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:30:28,289 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:30:28,289 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 36 [2022-11-03 02:30:28,298 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:28,975 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:28,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369193546] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:28,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890885555] [2022-11-03 02:30:28,976 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:30:28,976 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:28,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:28,977 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:28,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:29,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:29,012 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:30:29,039 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:29,094 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:29,122 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:29,166 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:30:29,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:29,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:29,286 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:30:29,287 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:30:29,614 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:36,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28669#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:36,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:36,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:36,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 16] total 51 [2022-11-03 02:30:36,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734638667] [2022-11-03 02:30:36,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:36,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-03 02:30:36,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:36,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-03 02:30:36,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=4305, Unknown=1, NotChecked=132, Total=4692 [2022-11-03 02:30:36,017 INFO L87 Difference]: Start difference. First operand 444 states and 568 transitions. Second operand has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:37,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:37,176 INFO L93 Difference]: Finished difference Result 526 states and 666 transitions. [2022-11-03 02:30:37,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 02:30:37,177 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-11-03 02:30:37,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:37,179 INFO L225 Difference]: With dead ends: 526 [2022-11-03 02:30:37,179 INFO L226 Difference]: Without dead ends: 523 [2022-11-03 02:30:37,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1637 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=330, Invalid=5373, Unknown=1, NotChecked=148, Total=5852 [2022-11-03 02:30:37,180 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 49 mSDsluCounter, 1119 mSDsCounter, 0 mSdLazyCounter, 816 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 998 SdHoareTripleChecker+Invalid, 1084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 254 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:37,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 998 Invalid, 1084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 816 Invalid, 0 Unknown, 254 Unchecked, 0.6s Time] [2022-11-03 02:30:37,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2022-11-03 02:30:37,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 519. [2022-11-03 02:30:37,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 515 states have (on average 1.279611650485437) internal successors, (659), 518 states have internal predecessors, (659), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:37,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 659 transitions. [2022-11-03 02:30:37,187 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 659 transitions. Word has length 41 [2022-11-03 02:30:37,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:37,187 INFO L495 AbstractCegarLoop]: Abstraction has 519 states and 659 transitions. [2022-11-03 02:30:37,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:37,188 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 659 transitions. [2022-11-03 02:30:37,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-03 02:30:37,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:37,189 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:37,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-11-03 02:30:37,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-03 02:30:37,417 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:37,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:37,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1444008922, now seen corresponding path program 1 times [2022-11-03 02:30:37,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:37,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329192648] [2022-11-03 02:30:37,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:37,418 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:37,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:37,770 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:30:37,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:37,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329192648] [2022-11-03 02:30:37,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329192648] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:37,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115042601] [2022-11-03 02:30:37,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:37,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:37,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:37,772 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:37,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-03 02:30:37,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:37,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-03 02:30:37,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:38,113 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:30:38,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:38,379 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:30:38,412 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:30:38,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115042601] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:38,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [276790415] [2022-11-03 02:30:38,414 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-03 02:30:38,414 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:38,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:38,415 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:38,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:38,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:38,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:30:38,471 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:38,509 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:38,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:38,583 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:30:38,584 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:30:38,632 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:38,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:38,715 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:30:38,715 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:30:39,095 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:44,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30015#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:44,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:44,811 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:44,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-03 02:30:44,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951521259] [2022-11-03 02:30:44,811 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:44,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:30:44,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:44,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:30:44,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:30:44,812 INFO L87 Difference]: Start difference. First operand 519 states and 659 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 21 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:45,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:45,779 INFO L93 Difference]: Finished difference Result 604 states and 740 transitions. [2022-11-03 02:30:45,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 02:30:45,779 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 21 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-03 02:30:45,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:45,781 INFO L225 Difference]: With dead ends: 604 [2022-11-03 02:30:45,781 INFO L226 Difference]: Without dead ends: 604 [2022-11-03 02:30:45,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 90 SyntacticMatches, 7 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 669 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=377, Invalid=2485, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 02:30:45,782 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 460 mSDsluCounter, 697 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 460 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:45,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [460 Valid, 673 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 961 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:30:45,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2022-11-03 02:30:45,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 519. [2022-11-03 02:30:45,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 515 states have (on average 1.2757281553398059) internal successors, (657), 518 states have internal predecessors, (657), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:45,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 657 transitions. [2022-11-03 02:30:45,790 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 657 transitions. Word has length 42 [2022-11-03 02:30:45,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:45,790 INFO L495 AbstractCegarLoop]: Abstraction has 519 states and 657 transitions. [2022-11-03 02:30:45,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 21 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:45,791 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 657 transitions. [2022-11-03 02:30:45,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-03 02:30:45,792 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:45,792 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:45,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:46,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:46,017 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:46,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:46,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1354927365, now seen corresponding path program 2 times [2022-11-03 02:30:46,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:46,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121116898] [2022-11-03 02:30:46,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:46,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:46,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:46,314 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:30:46,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:46,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121116898] [2022-11-03 02:30:46,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121116898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:46,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1183192192] [2022-11-03 02:30:46,315 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:30:46,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:46,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:46,316 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:46,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-03 02:30:46,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:30:46,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:46,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 02:30:46,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:46,502 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:30:46,574 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:46,614 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:30:47,047 INFO L356 Elim1Store]: treesize reduction 4, result has 76.5 percent of original size [2022-11-03 02:30:47,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 23 [2022-11-03 02:30:47,128 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-03 02:30:47,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:47,681 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:30:47,681 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 34 [2022-11-03 02:30:47,699 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:30:47,699 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 57 [2022-11-03 02:30:47,716 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 15 [2022-11-03 02:30:47,728 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:30:47,877 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-03 02:30:47,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1183192192] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:47,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259382871] [2022-11-03 02:30:47,879 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:30:47,879 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:47,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:47,879 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:47,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:47,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:30:47,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:30:47,930 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:47,965 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:47,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:30:48,051 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:30:48,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:30:48,099 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:48,135 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:48,186 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:30:48,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:30:49,079 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:58,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31461#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:30:58,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:58,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:30:58,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 29 [2022-11-03 02:30:58,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142944742] [2022-11-03 02:30:58,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:58,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-03 02:30:58,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:58,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-03 02:30:58,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2520, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:30:58,116 INFO L87 Difference]: Start difference. First operand 519 states and 657 transitions. Second operand has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:58,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:58,679 INFO L93 Difference]: Finished difference Result 592 states and 734 transitions. [2022-11-03 02:30:58,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 02:30:58,681 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-03 02:30:58,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:58,684 INFO L225 Difference]: With dead ends: 592 [2022-11-03 02:30:58,684 INFO L226 Difference]: Without dead ends: 592 [2022-11-03 02:30:58,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=323, Invalid=3709, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 02:30:58,685 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 88 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:58,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 393 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 0 Unknown, 78 Unchecked, 0.1s Time] [2022-11-03 02:30:58,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-11-03 02:30:58,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 545. [2022-11-03 02:30:58,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 541 states have (on average 1.268022181146026) internal successors, (686), 544 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:58,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 686 transitions. [2022-11-03 02:30:58,690 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 686 transitions. Word has length 42 [2022-11-03 02:30:58,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:58,691 INFO L495 AbstractCegarLoop]: Abstraction has 545 states and 686 transitions. [2022-11-03 02:30:58,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:30:58,691 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 686 transitions. [2022-11-03 02:30:58,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 02:30:58,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:58,692 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:58,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:58,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-03 02:30:58,915 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:30:58,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:58,915 INFO L85 PathProgramCache]: Analyzing trace with hash -598317878, now seen corresponding path program 8 times [2022-11-03 02:30:58,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:58,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942183870] [2022-11-03 02:30:58,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:58,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:58,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:59,282 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:30:59,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:59,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942183870] [2022-11-03 02:30:59,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942183870] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:30:59,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790137551] [2022-11-03 02:30:59,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:30:59,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:59,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:59,284 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:59,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-03 02:30:59,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 02:30:59,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:59,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-03 02:30:59,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:59,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:30:59,933 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:30:59,985 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:31:00,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:00,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:00,713 INFO L356 Elim1Store]: treesize reduction 8, result has 68.0 percent of original size [2022-11-03 02:31:00,714 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 31 [2022-11-03 02:31:00,871 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 44 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:31:00,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:01,905 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:01,905 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 48 [2022-11-03 02:31:01,923 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:01,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 87 treesize of output 86 [2022-11-03 02:31:01,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 22 [2022-11-03 02:31:02,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-03 02:31:02,867 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 1 proven. 52 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-03 02:31:02,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790137551] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:02,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865747078] [2022-11-03 02:31:02,869 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:31:02,869 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:02,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:02,869 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:02,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:02,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:02,892 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:31:02,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:02,959 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:02,984 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:03,032 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:31:03,033 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:31:03,081 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:03,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:03,164 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:31:03,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:31:03,514 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:10,183 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32954#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:10,183 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:10,183 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:10,183 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 20] total 52 [2022-11-03 02:31:10,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953084638] [2022-11-03 02:31:10,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:10,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-03 02:31:10,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:10,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-03 02:31:10,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=4533, Unknown=0, NotChecked=0, Total=4970 [2022-11-03 02:31:10,185 INFO L87 Difference]: Start difference. First operand 545 states and 686 transitions. Second operand has 54 states, 53 states have (on average 2.2264150943396226) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:12,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:12,719 INFO L93 Difference]: Finished difference Result 576 states and 722 transitions. [2022-11-03 02:31:12,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-03 02:31:12,720 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.2264150943396226) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-11-03 02:31:12,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:12,723 INFO L225 Difference]: With dead ends: 576 [2022-11-03 02:31:12,723 INFO L226 Difference]: Without dead ends: 576 [2022-11-03 02:31:12,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2386 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=1019, Invalid=9693, Unknown=0, NotChecked=0, Total=10712 [2022-11-03 02:31:12,725 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 181 mSDsluCounter, 848 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 819 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:12,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 819 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 579 Invalid, 0 Unknown, 114 Unchecked, 0.4s Time] [2022-11-03 02:31:12,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2022-11-03 02:31:12,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 565. [2022-11-03 02:31:12,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 565 states, 561 states have (on average 1.267379679144385) internal successors, (711), 564 states have internal predecessors, (711), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:12,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 565 states to 565 states and 711 transitions. [2022-11-03 02:31:12,732 INFO L78 Accepts]: Start accepts. Automaton has 565 states and 711 transitions. Word has length 43 [2022-11-03 02:31:12,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:12,732 INFO L495 AbstractCegarLoop]: Abstraction has 565 states and 711 transitions. [2022-11-03 02:31:12,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.2264150943396226) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:12,733 INFO L276 IsEmpty]: Start isEmpty. Operand 565 states and 711 transitions. [2022-11-03 02:31:12,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 02:31:12,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:12,734 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:12,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:12,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:12,945 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:31:12,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:12,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1376230790, now seen corresponding path program 3 times [2022-11-03 02:31:12,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:12,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048752768] [2022-11-03 02:31:12,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:12,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:14,195 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 46 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:31:14,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:14,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048752768] [2022-11-03 02:31:14,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048752768] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:14,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430542172] [2022-11-03 02:31:14,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:31:14,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:14,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:14,197 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:14,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-03 02:31:14,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:31:14,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:14,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-03 02:31:14,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:14,389 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:31:14,693 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:14,758 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:31:14,923 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:31:14,925 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:14,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:15,003 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1584 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1584) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 02:31:15,008 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:15,008 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:31:15,014 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:15,015 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:31:15,264 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:15,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430542172] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:15,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651721322] [2022-11-03 02:31:15,265 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:31:15,265 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:15,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:15,265 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:15,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:15,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:15,299 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:31:15,332 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:15,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:15,384 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:15,436 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:31:15,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:31:15,481 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:15,517 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:15,563 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:31:15,564 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:31:15,943 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:20,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34482#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:20,630 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:20,630 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:20,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15, 15] total 34 [2022-11-03 02:31:20,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252888707] [2022-11-03 02:31:20,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:20,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 02:31:20,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:20,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 02:31:20,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2185, Unknown=1, NotChecked=94, Total=2450 [2022-11-03 02:31:20,632 INFO L87 Difference]: Start difference. First operand 565 states and 711 transitions. Second operand has 35 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 34 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:22,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:22,592 INFO L93 Difference]: Finished difference Result 766 states and 960 transitions. [2022-11-03 02:31:22,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:31:22,593 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 34 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-11-03 02:31:22,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:22,596 INFO L225 Difference]: With dead ends: 766 [2022-11-03 02:31:22,596 INFO L226 Difference]: Without dead ends: 696 [2022-11-03 02:31:22,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 100 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=305, Invalid=3988, Unknown=1, NotChecked=128, Total=4422 [2022-11-03 02:31:22,597 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 123 mSDsluCounter, 2013 mSDsCounter, 0 mSdLazyCounter, 1423 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 1875 SdHoareTripleChecker+Invalid, 1603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:22,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 1875 Invalid, 1603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1423 Invalid, 0 Unknown, 158 Unchecked, 0.9s Time] [2022-11-03 02:31:22,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2022-11-03 02:31:22,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 628. [2022-11-03 02:31:22,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 628 states, 624 states have (on average 1.2740384615384615) internal successors, (795), 627 states have internal predecessors, (795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:22,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 628 states to 628 states and 795 transitions. [2022-11-03 02:31:22,605 INFO L78 Accepts]: Start accepts. Automaton has 628 states and 795 transitions. Word has length 45 [2022-11-03 02:31:22,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:22,605 INFO L495 AbstractCegarLoop]: Abstraction has 628 states and 795 transitions. [2022-11-03 02:31:22,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 34 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:22,606 INFO L276 IsEmpty]: Start isEmpty. Operand 628 states and 795 transitions. [2022-11-03 02:31:22,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 02:31:22,607 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:22,607 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:22,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:22,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:22,829 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:31:22,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:22,829 INFO L85 PathProgramCache]: Analyzing trace with hash -424954857, now seen corresponding path program 1 times [2022-11-03 02:31:22,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:22,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158994154] [2022-11-03 02:31:22,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:22,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:22,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:23,240 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:31:23,240 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:23,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158994154] [2022-11-03 02:31:23,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158994154] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:23,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556849504] [2022-11-03 02:31:23,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:23,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:23,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:23,241 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:23,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-03 02:31:23,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:23,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 02:31:23,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:23,576 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:31:23,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:23,833 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:31:23,880 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 02:31:23,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556849504] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:23,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [892015401] [2022-11-03 02:31:23,881 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-03 02:31:23,881 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:23,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:23,882 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:23,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:23,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:23,909 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:31:23,939 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:23,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:23,994 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:24,043 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:31:24,088 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:24,129 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:24,166 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:31:24,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:31:25,008 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:33,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36219#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#t~pre8#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#t~pre8#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~pre8#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~pre8#1.offset| 1)) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (= |ULTIMATE.start_cstrncmp_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_#t~pre8#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:33,475 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:33,475 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:33,475 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 23 [2022-11-03 02:31:33,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852879338] [2022-11-03 02:31:33,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:33,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 02:31:33,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:33,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 02:31:33,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1997, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 02:31:33,476 INFO L87 Difference]: Start difference. First operand 628 states and 795 transitions. Second operand has 24 states, 23 states have (on average 3.4782608695652173) internal successors, (80), 24 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:34,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:34,600 INFO L93 Difference]: Finished difference Result 1509 states and 1862 transitions. [2022-11-03 02:31:34,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:31:34,601 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.4782608695652173) internal successors, (80), 24 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-11-03 02:31:34,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:34,603 INFO L225 Difference]: With dead ends: 1509 [2022-11-03 02:31:34,603 INFO L226 Difference]: Without dead ends: 1503 [2022-11-03 02:31:34,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 96 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1211 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=613, Invalid=3809, Unknown=0, NotChecked=0, Total=4422 [2022-11-03 02:31:34,604 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 929 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 929 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:34,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [929 Valid, 713 Invalid, 861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 752 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:31:34,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1503 states. [2022-11-03 02:31:34,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1503 to 901. [2022-11-03 02:31:34,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 901 states, 897 states have (on average 1.3154960981047938) internal successors, (1180), 900 states have internal predecessors, (1180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:34,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 901 states to 901 states and 1180 transitions. [2022-11-03 02:31:34,619 INFO L78 Accepts]: Start accepts. Automaton has 901 states and 1180 transitions. Word has length 46 [2022-11-03 02:31:34,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:34,619 INFO L495 AbstractCegarLoop]: Abstraction has 901 states and 1180 transitions. [2022-11-03 02:31:34,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.4782608695652173) internal successors, (80), 24 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:34,620 INFO L276 IsEmpty]: Start isEmpty. Operand 901 states and 1180 transitions. [2022-11-03 02:31:34,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 02:31:34,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:34,621 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:34,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:34,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:34,838 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:31:34,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:34,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1280727606, now seen corresponding path program 4 times [2022-11-03 02:31:34,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:34,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225495609] [2022-11-03 02:31:34,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:34,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:34,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:35,205 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:35,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:35,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225495609] [2022-11-03 02:31:35,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225495609] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:35,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349849450] [2022-11-03 02:31:35,206 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:31:35,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:35,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:35,208 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:35,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-03 02:31:35,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:35,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-03 02:31:35,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:35,538 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:35,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:35,870 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:31:35,912 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:35,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349849450] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:35,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153627398] [2022-11-03 02:31:35,913 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:31:35,913 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:35,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:35,913 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:35,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:35,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:35,935 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:31:35,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:35,999 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:36,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:36,062 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:31:36,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:36,137 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:36,182 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:31:36,182 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:31:36,692 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:42,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38992#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:42,180 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:42,180 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:42,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2022-11-03 02:31:42,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369539182] [2022-11-03 02:31:42,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:42,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 02:31:42,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:42,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 02:31:42,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1387, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:31:42,181 INFO L87 Difference]: Start difference. First operand 901 states and 1180 transitions. Second operand has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:43,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:43,290 INFO L93 Difference]: Finished difference Result 1128 states and 1458 transitions. [2022-11-03 02:31:43,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:31:43,290 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-11-03 02:31:43,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:43,293 INFO L225 Difference]: With dead ends: 1128 [2022-11-03 02:31:43,294 INFO L226 Difference]: Without dead ends: 1128 [2022-11-03 02:31:43,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 106 SyntacticMatches, 8 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=384, Invalid=2586, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 02:31:43,294 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 617 mSDsluCounter, 1030 mSDsCounter, 0 mSdLazyCounter, 1198 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 617 SdHoareTripleChecker+Valid, 964 SdHoareTripleChecker+Invalid, 1214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:43,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [617 Valid, 964 Invalid, 1214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1198 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:31:43,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2022-11-03 02:31:43,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 998. [2022-11-03 02:31:43,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 994 states have (on average 1.3269617706237424) internal successors, (1319), 997 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:43,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1319 transitions. [2022-11-03 02:31:43,305 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1319 transitions. Word has length 47 [2022-11-03 02:31:43,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:43,305 INFO L495 AbstractCegarLoop]: Abstraction has 998 states and 1319 transitions. [2022-11-03 02:31:43,305 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:43,305 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1319 transitions. [2022-11-03 02:31:43,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 02:31:43,306 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:43,306 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:43,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:43,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:43,526 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:31:43,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:43,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1047890674, now seen corresponding path program 2 times [2022-11-03 02:31:43,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:43,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894873501] [2022-11-03 02:31:43,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:43,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:43,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:43,884 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:31:43,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:43,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894873501] [2022-11-03 02:31:43,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894873501] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:43,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240147707] [2022-11-03 02:31:43,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:31:43,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:43,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:43,886 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:43,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-03 02:31:44,135 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:31:44,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:44,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-03 02:31:44,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:44,166 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:31:44,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-03 02:31:44,181 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:31:44,571 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-03 02:31:44,670 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-03 02:31:45,351 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:45,351 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 20 [2022-11-03 02:31:45,567 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 02:31:45,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:46,153 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:46,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:31:46,164 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:46,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 34 [2022-11-03 02:31:46,170 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:46,725 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-03 02:31:46,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240147707] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:46,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69834627] [2022-11-03 02:31:46,726 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-03 02:31:46,726 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:46,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:46,727 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:46,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:46,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:46,758 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:31:46,783 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:46,820 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:46,841 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:31:46,891 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:31:46,892 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:31:46,946 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:46,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:47,031 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:31:47,031 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:31:47,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:54,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41480#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:54,257 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:54,258 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:31:54,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 33 [2022-11-03 02:31:54,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568026992] [2022-11-03 02:31:54,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:54,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 02:31:54,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:54,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 02:31:54,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2524, Unknown=5, NotChecked=0, Total=2756 [2022-11-03 02:31:54,259 INFO L87 Difference]: Start difference. First operand 998 states and 1319 transitions. Second operand has 35 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 34 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:56,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:56,693 INFO L93 Difference]: Finished difference Result 1325 states and 1683 transitions. [2022-11-03 02:31:56,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-03 02:31:56,693 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 34 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-03 02:31:56,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:56,697 INFO L225 Difference]: With dead ends: 1325 [2022-11-03 02:31:56,697 INFO L226 Difference]: Without dead ends: 1325 [2022-11-03 02:31:56,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1561 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=518, Invalid=5328, Unknown=6, NotChecked=0, Total=5852 [2022-11-03 02:31:56,698 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 110 mSDsluCounter, 780 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 161 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:56,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 786 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 478 Invalid, 0 Unknown, 161 Unchecked, 0.3s Time] [2022-11-03 02:31:56,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1325 states. [2022-11-03 02:31:56,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1325 to 1018. [2022-11-03 02:31:56,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1018 states, 1014 states have (on average 1.3224852071005917) internal successors, (1341), 1017 states have internal predecessors, (1341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:56,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1018 states to 1018 states and 1341 transitions. [2022-11-03 02:31:56,707 INFO L78 Accepts]: Start accepts. Automaton has 1018 states and 1341 transitions. Word has length 48 [2022-11-03 02:31:56,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:56,707 INFO L495 AbstractCegarLoop]: Abstraction has 1018 states and 1341 transitions. [2022-11-03 02:31:56,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.9705882352941178) internal successors, (101), 34 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:31:56,707 INFO L276 IsEmpty]: Start isEmpty. Operand 1018 states and 1341 transitions. [2022-11-03 02:31:56,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-03 02:31:56,709 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:56,709 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:56,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:56,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-03 02:31:56,917 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:31:56,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:56,917 INFO L85 PathProgramCache]: Analyzing trace with hash -351811556, now seen corresponding path program 3 times [2022-11-03 02:31:56,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:56,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932815378] [2022-11-03 02:31:56,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:56,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:56,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:31:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 02:31:57,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:57,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932815378] [2022-11-03 02:31:57,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932815378] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:31:57,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542327624] [2022-11-03 02:31:57,153 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:31:57,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:57,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:57,154 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:57,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-03 02:31:57,408 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:31:57,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:57,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-03 02:31:57,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:57,795 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:31:57,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:31:57,860 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2022-11-03 02:31:58,557 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:31:58,568 INFO L356 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2022-11-03 02:31:58,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 18 [2022-11-03 02:31:58,603 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:31:58,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:59,161 INFO L356 Elim1Store]: treesize reduction 14, result has 65.9 percent of original size [2022-11-03 02:31:59,161 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 101 treesize of output 110 [2022-11-03 02:31:59,173 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:59,173 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 44 [2022-11-03 02:31:59,188 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2022-11-03 02:31:59,237 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:31:59,237 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 74 [2022-11-03 02:32:00,558 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 16 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:00,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542327624] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:00,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [359285203] [2022-11-03 02:32:00,560 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:32:00,560 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:00,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:00,560 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:00,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:00,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:00,595 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:32:00,625 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:32:00,658 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:00,682 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:00,722 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:32:00,765 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:00,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:00,855 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:32:00,855 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:32:02,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:13,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44229#(and (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|))))' at error location [2022-11-03 02:32:13,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:13,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:13,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 22, 22] total 50 [2022-11-03 02:32:13,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973776957] [2022-11-03 02:32:13,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:13,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:32:13,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:13,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:32:13,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=4838, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:32:13,295 INFO L87 Difference]: Start difference. First operand 1018 states and 1341 transitions. Second operand has 50 states, 50 states have (on average 2.6) internal successors, (130), 50 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:16,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:16,216 INFO L93 Difference]: Finished difference Result 1714 states and 2215 transitions. [2022-11-03 02:32:16,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-03 02:32:16,217 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.6) internal successors, (130), 50 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-03 02:32:16,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:16,224 INFO L225 Difference]: With dead ends: 1714 [2022-11-03 02:32:16,225 INFO L226 Difference]: Without dead ends: 1696 [2022-11-03 02:32:16,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2291 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=704, Invalid=10008, Unknown=0, NotChecked=0, Total=10712 [2022-11-03 02:32:16,226 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 420 mSDsluCounter, 2923 mSDsCounter, 0 mSdLazyCounter, 1856 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 2748 SdHoareTripleChecker+Invalid, 2435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1856 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 558 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:16,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [420 Valid, 2748 Invalid, 2435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1856 Invalid, 0 Unknown, 558 Unchecked, 1.2s Time] [2022-11-03 02:32:16,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1696 states. [2022-11-03 02:32:16,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1696 to 1167. [2022-11-03 02:32:16,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1167 states, 1163 states have (on average 1.3267411865864145) internal successors, (1543), 1166 states have internal predecessors, (1543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:16,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1167 states to 1167 states and 1543 transitions. [2022-11-03 02:32:16,237 INFO L78 Accepts]: Start accepts. Automaton has 1167 states and 1543 transitions. Word has length 48 [2022-11-03 02:32:16,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:16,237 INFO L495 AbstractCegarLoop]: Abstraction has 1167 states and 1543 transitions. [2022-11-03 02:32:16,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.6) internal successors, (130), 50 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:16,237 INFO L276 IsEmpty]: Start isEmpty. Operand 1167 states and 1543 transitions. [2022-11-03 02:32:16,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:32:16,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:16,239 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:32:16,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:16,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-11-03 02:32:16,445 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:32:16,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:16,445 INFO L85 PathProgramCache]: Analyzing trace with hash -589889582, now seen corresponding path program 5 times [2022-11-03 02:32:16,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:16,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367586344] [2022-11-03 02:32:16,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:16,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:16,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:18,347 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:32:18,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:18,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367586344] [2022-11-03 02:32:18,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367586344] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:18,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907435288] [2022-11-03 02:32:18,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:32:18,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:18,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:18,349 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:18,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-03 02:32:18,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 02:32:18,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:18,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 79 conjunts are in the unsatisfiable core [2022-11-03 02:32:18,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:18,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:32:19,011 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:19,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:32:19,650 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:32:19,650 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:32:19,693 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:32:19,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:20,013 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1841 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1841) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 4 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 02:32:20,028 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:20,028 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:32:20,035 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:20,036 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:32:20,399 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:32:20,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907435288] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:20,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469061335] [2022-11-03 02:32:20,401 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:32:20,401 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:20,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:20,401 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:20,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:20,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:20,434 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:32:20,461 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:20,499 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:20,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:32:20,573 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:32:20,573 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:32:20,621 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:20,659 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:20,706 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:32:20,707 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:32:21,077 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:26,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47552#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:26,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:26,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:26,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 17, 17] total 50 [2022-11-03 02:32:26,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042328151] [2022-11-03 02:32:26,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:26,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-03 02:32:26,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:26,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-03 02:32:26,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=3926, Unknown=1, NotChecked=126, Total=4290 [2022-11-03 02:32:26,042 INFO L87 Difference]: Start difference. First operand 1167 states and 1543 transitions. Second operand has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:28,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:28,755 INFO L93 Difference]: Finished difference Result 1841 states and 2401 transitions. [2022-11-03 02:32:28,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-03 02:32:28,756 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-03 02:32:28,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:28,761 INFO L225 Difference]: With dead ends: 1841 [2022-11-03 02:32:28,761 INFO L226 Difference]: Without dead ends: 1725 [2022-11-03 02:32:28,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 106 SyntacticMatches, 10 SemanticMatches, 72 ConstructedPredicates, 1 IntricatePredicates, 5 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=303, Invalid=4956, Unknown=1, NotChecked=142, Total=5402 [2022-11-03 02:32:28,762 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 299 mSDsluCounter, 3935 mSDsCounter, 0 mSdLazyCounter, 3100 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 3571 SdHoareTripleChecker+Invalid, 3585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 3100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 472 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:28,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 3571 Invalid, 3585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 3100 Invalid, 0 Unknown, 472 Unchecked, 2.2s Time] [2022-11-03 02:32:28,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1725 states. [2022-11-03 02:32:28,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1725 to 1569. [2022-11-03 02:32:28,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1569 states, 1565 states have (on average 1.3309904153354633) internal successors, (2083), 1568 states have internal predecessors, (2083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:28,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1569 states to 1569 states and 2083 transitions. [2022-11-03 02:32:28,776 INFO L78 Accepts]: Start accepts. Automaton has 1569 states and 2083 transitions. Word has length 51 [2022-11-03 02:32:28,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:28,776 INFO L495 AbstractCegarLoop]: Abstraction has 1569 states and 2083 transitions. [2022-11-03 02:32:28,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.4705882352941178) internal successors, (126), 50 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:28,776 INFO L276 IsEmpty]: Start isEmpty. Operand 1569 states and 2083 transitions. [2022-11-03 02:32:28,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-03 02:32:28,778 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:28,778 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:32:28,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:28,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:28,994 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:32:28,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:28,994 INFO L85 PathProgramCache]: Analyzing trace with hash -857182118, now seen corresponding path program 1 times [2022-11-03 02:32:28,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:28,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478810777] [2022-11-03 02:32:28,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:28,995 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:29,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:29,032 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 02:32:29,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:29,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478810777] [2022-11-03 02:32:29,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478810777] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:32:29,033 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:32:29,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:32:29,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322240026] [2022-11-03 02:32:29,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:32:29,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:32:29,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:29,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:32:29,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:32:29,034 INFO L87 Difference]: Start difference. First operand 1569 states and 2083 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:29,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:29,076 INFO L93 Difference]: Finished difference Result 1592 states and 2078 transitions. [2022-11-03 02:32:29,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:32:29,077 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-03 02:32:29,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:29,081 INFO L225 Difference]: With dead ends: 1592 [2022-11-03 02:32:29,081 INFO L226 Difference]: Without dead ends: 1450 [2022-11-03 02:32:29,082 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:32:29,082 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:29,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 77 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:32:29,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1450 states. [2022-11-03 02:32:29,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1450 to 1439. [2022-11-03 02:32:29,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1435 states have (on average 1.2209059233449477) internal successors, (1752), 1438 states have internal predecessors, (1752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:29,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 1752 transitions. [2022-11-03 02:32:29,094 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 1752 transitions. Word has length 51 [2022-11-03 02:32:29,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:29,095 INFO L495 AbstractCegarLoop]: Abstraction has 1439 states and 1752 transitions. [2022-11-03 02:32:29,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:29,095 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 1752 transitions. [2022-11-03 02:32:29,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 02:32:29,096 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:29,097 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:32:29,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-11-03 02:32:29,097 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:32:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:29,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1314665167, now seen corresponding path program 1 times [2022-11-03 02:32:29,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:29,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564939800] [2022-11-03 02:32:29,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:29,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:29,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:30,528 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 48 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:32:30,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:30,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564939800] [2022-11-03 02:32:30,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564939800] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:30,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074793489] [2022-11-03 02:32:30,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:30,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:30,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:30,529 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:30,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-03 02:32:30,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:30,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-03 02:32:30,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:30,737 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:32:31,066 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:31,129 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:32:31,379 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:32:31,416 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 28 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:32:31,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:31,468 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1919 (Array Int Int))) (= 0 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1919) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)))) is different from false [2022-11-03 02:32:31,475 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:31,475 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:32:31,481 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:31,481 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:32:31,744 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 28 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:32:31,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074793489] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:31,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1325176389] [2022-11-03 02:32:31,745 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:32:31,745 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:31,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:31,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:31,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:31,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:31,767 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:32:31,797 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:32:31,826 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:31,848 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:32:31,900 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:32:31,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:32:31,950 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:32,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:32,064 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:32:32,064 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:32:33,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:43,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54384#(and (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:32:43,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:43,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:32:43,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 16, 16] total 42 [2022-11-03 02:32:43,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91660989] [2022-11-03 02:32:43,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:43,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-03 02:32:43,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:43,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-03 02:32:43,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=3924, Unknown=1, NotChecked=126, Total=4290 [2022-11-03 02:32:43,943 INFO L87 Difference]: Start difference. First operand 1439 states and 1752 transitions. Second operand has 43 states, 43 states have (on average 2.2325581395348837) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:45,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:45,480 INFO L93 Difference]: Finished difference Result 1547 states and 1856 transitions. [2022-11-03 02:32:45,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:32:45,480 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.2325581395348837) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-03 02:32:45,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:45,483 INFO L225 Difference]: With dead ends: 1547 [2022-11-03 02:32:45,483 INFO L226 Difference]: Without dead ends: 1480 [2022-11-03 02:32:45,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 109 SyntacticMatches, 7 SemanticMatches, 77 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1590 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=340, Invalid=5669, Unknown=1, NotChecked=152, Total=6162 [2022-11-03 02:32:45,483 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 183 mSDsluCounter, 1780 mSDsCounter, 0 mSdLazyCounter, 1760 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 1513 SdHoareTripleChecker+Invalid, 1892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 111 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:45,483 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 1513 Invalid, 1892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1760 Invalid, 0 Unknown, 111 Unchecked, 1.1s Time] [2022-11-03 02:32:45,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1480 states. [2022-11-03 02:32:45,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1480 to 1306. [2022-11-03 02:32:45,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1306 states, 1302 states have (on average 1.2227342549923195) internal successors, (1592), 1305 states have internal predecessors, (1592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:45,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1306 states to 1306 states and 1592 transitions. [2022-11-03 02:32:45,495 INFO L78 Accepts]: Start accepts. Automaton has 1306 states and 1592 transitions. Word has length 52 [2022-11-03 02:32:45,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:45,495 INFO L495 AbstractCegarLoop]: Abstraction has 1306 states and 1592 transitions. [2022-11-03 02:32:45,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.2325581395348837) internal successors, (96), 42 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:32:45,495 INFO L276 IsEmpty]: Start isEmpty. Operand 1306 states and 1592 transitions. [2022-11-03 02:32:45,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 02:32:45,496 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:45,496 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:32:45,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-03 02:32:45,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-03 02:32:45,697 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:32:45,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:45,697 INFO L85 PathProgramCache]: Analyzing trace with hash -427628864, now seen corresponding path program 1 times [2022-11-03 02:32:45,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:45,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747446528] [2022-11-03 02:32:45,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:45,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:45,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:45,923 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:32:45,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:45,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747446528] [2022-11-03 02:32:45,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747446528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:32:45,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917870654] [2022-11-03 02:32:45,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:45,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:45,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:45,929 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:45,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-03 02:32:46,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:32:46,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 104 conjunts are in the unsatisfiable core [2022-11-03 02:32:46,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:46,513 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:46,580 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:32:46,580 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 23 [2022-11-03 02:32:46,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 3 [2022-11-03 02:32:47,093 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:32:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:32:47,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:47,599 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:47,599 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:32:47,608 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:47,608 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:32:47,616 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:32:47,616 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2022-11-03 02:32:48,086 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:32:48,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917870654] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:48,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [75955020] [2022-11-03 02:32:48,087 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2022-11-03 02:32:48,087 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:48,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:48,088 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:48,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:48,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:32:48,115 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:32:48,154 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:48,184 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:48,207 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:48,259 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:32:48,309 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:48,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:32:48,376 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:32:48,377 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:32:53,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:07,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57639#(and (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:33:07,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:07,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:07,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 23, 20] total 47 [2022-11-03 02:33:07,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315068981] [2022-11-03 02:33:07,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:07,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-03 02:33:07,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:07,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-03 02:33:07,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=5099, Unknown=1, NotChecked=0, Total=5402 [2022-11-03 02:33:07,214 INFO L87 Difference]: Start difference. First operand 1306 states and 1592 transitions. Second operand has 47 states, 47 states have (on average 2.9148936170212765) internal successors, (137), 47 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:08,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:08,992 INFO L93 Difference]: Finished difference Result 1473 states and 1719 transitions. [2022-11-03 02:33:08,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-03 02:33:08,992 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.9148936170212765) internal successors, (137), 47 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-03 02:33:08,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:08,995 INFO L225 Difference]: With dead ends: 1473 [2022-11-03 02:33:08,996 INFO L226 Difference]: Without dead ends: 1311 [2022-11-03 02:33:08,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 87 SyntacticMatches, 3 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2221 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=523, Invalid=8982, Unknown=1, NotChecked=0, Total=9506 [2022-11-03 02:33:08,997 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 114 mSDsluCounter, 916 mSDsCounter, 0 mSdLazyCounter, 1077 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 1311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 211 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:08,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 858 Invalid, 1311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1077 Invalid, 0 Unknown, 211 Unchecked, 0.6s Time] [2022-11-03 02:33:08,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2022-11-03 02:33:09,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1093. [2022-11-03 02:33:09,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1093 states, 1089 states have (on average 1.2084481175390267) internal successors, (1316), 1092 states have internal predecessors, (1316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:09,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1093 states to 1093 states and 1316 transitions. [2022-11-03 02:33:09,010 INFO L78 Accepts]: Start accepts. Automaton has 1093 states and 1316 transitions. Word has length 52 [2022-11-03 02:33:09,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:09,011 INFO L495 AbstractCegarLoop]: Abstraction has 1093 states and 1316 transitions. [2022-11-03 02:33:09,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.9148936170212765) internal successors, (137), 47 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:09,011 INFO L276 IsEmpty]: Start isEmpty. Operand 1093 states and 1316 transitions. [2022-11-03 02:33:09,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 02:33:09,012 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:09,012 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:33:09,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-03 02:33:09,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-03 02:33:09,221 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:33:09,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:09,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1006290198, now seen corresponding path program 6 times [2022-11-03 02:33:09,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:09,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796416007] [2022-11-03 02:33:09,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:09,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:09,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:09,687 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 20 proven. 66 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:33:09,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:09,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796416007] [2022-11-03 02:33:09,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796416007] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:33:09,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316252926] [2022-11-03 02:33:09,688 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:33:09,688 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:09,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:09,689 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:09,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-03 02:33:10,169 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:33:10,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:33:10,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-03 02:33:10,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:10,365 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 30 proven. 56 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:33:10,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:10,765 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:33:10,817 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 30 proven. 56 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:33:10,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316252926] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:10,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [877964418] [2022-11-03 02:33:10,818 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:33:10,818 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:10,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:10,819 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:10,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:10,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:10,847 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:33:10,879 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:10,906 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:10,929 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:10,978 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:33:10,978 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:33:11,026 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:11,061 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:11,107 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:33:11,107 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:33:11,608 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:16,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60621#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:33:16,874 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:16,874 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:16,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2022-11-03 02:33:16,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56697489] [2022-11-03 02:33:16,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:16,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 02:33:16,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:16,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 02:33:16,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1617, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:33:16,875 INFO L87 Difference]: Start difference. First operand 1093 states and 1316 transitions. Second operand has 28 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 27 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:18,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:18,305 INFO L93 Difference]: Finished difference Result 1303 states and 1534 transitions. [2022-11-03 02:33:18,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-03 02:33:18,305 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 27 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-11-03 02:33:18,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:18,308 INFO L225 Difference]: With dead ends: 1303 [2022-11-03 02:33:18,309 INFO L226 Difference]: Without dead ends: 1303 [2022-11-03 02:33:18,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 125 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=470, Invalid=3190, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 02:33:18,310 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 623 mSDsluCounter, 1056 mSDsCounter, 0 mSdLazyCounter, 1506 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 623 SdHoareTripleChecker+Valid, 931 SdHoareTripleChecker+Invalid, 1530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:18,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [623 Valid, 931 Invalid, 1530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1506 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 02:33:18,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1303 states. [2022-11-03 02:33:18,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1303 to 1170. [2022-11-03 02:33:18,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1170 states, 1166 states have (on average 1.2109777015437393) internal successors, (1412), 1169 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:18,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1170 states to 1170 states and 1412 transitions. [2022-11-03 02:33:18,322 INFO L78 Accepts]: Start accepts. Automaton has 1170 states and 1412 transitions. Word has length 53 [2022-11-03 02:33:18,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:18,322 INFO L495 AbstractCegarLoop]: Abstraction has 1170 states and 1412 transitions. [2022-11-03 02:33:18,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.2962962962962963) internal successors, (89), 27 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:18,322 INFO L276 IsEmpty]: Start isEmpty. Operand 1170 states and 1412 transitions. [2022-11-03 02:33:18,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 02:33:18,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:18,324 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:33:18,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-03 02:33:18,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:18,524 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:33:18,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:18,525 INFO L85 PathProgramCache]: Analyzing trace with hash 922267757, now seen corresponding path program 2 times [2022-11-03 02:33:18,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:18,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419173195] [2022-11-03 02:33:18,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:18,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:18,976 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:33:18,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:18,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419173195] [2022-11-03 02:33:18,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419173195] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:33:18,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852996862] [2022-11-03 02:33:18,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:33:18,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:18,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:18,978 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:18,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-03 02:33:19,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:33:19,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:33:19,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 141 conjunts are in the unsatisfiable core [2022-11-03 02:33:19,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:19,275 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2022-11-03 02:33:19,492 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:19,544 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:33:21,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:21,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:21,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:21,225 INFO L356 Elim1Store]: treesize reduction 12, result has 65.7 percent of original size [2022-11-03 02:33:21,225 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 58 treesize of output 48 [2022-11-03 02:33:21,385 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-03 02:33:21,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:23,212 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:33:23,212 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 96 treesize of output 63 [2022-11-03 02:33:23,232 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:33:23,233 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 119 treesize of output 122 [2022-11-03 02:33:23,258 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:33:23,258 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 69 treesize of output 81 [2022-11-03 02:33:23,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:33:23,983 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-03 02:33:23,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852996862] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:23,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066719705] [2022-11-03 02:33:23,985 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:33:23,985 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:23,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:23,985 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:23,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:24,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:24,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:33:24,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:24,067 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:24,094 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:24,144 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:33:24,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:33:24,195 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:24,222 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:24,274 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:33:24,274 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:33:25,535 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:36,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63517#(and (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:33:36,692 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:36,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:36,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 19] total 52 [2022-11-03 02:33:36,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964423068] [2022-11-03 02:33:36,692 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:36,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-03 02:33:36,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:36,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-03 02:33:36,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=5452, Unknown=0, NotChecked=0, Total=5852 [2022-11-03 02:33:36,693 INFO L87 Difference]: Start difference. First operand 1170 states and 1412 transitions. Second operand has 54 states, 53 states have (on average 2.339622641509434) internal successors, (124), 53 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:39,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:39,859 INFO L93 Difference]: Finished difference Result 1365 states and 1619 transitions. [2022-11-03 02:33:39,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-03 02:33:39,860 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.339622641509434) internal successors, (124), 53 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-11-03 02:33:39,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:39,862 INFO L225 Difference]: With dead ends: 1365 [2022-11-03 02:33:39,862 INFO L226 Difference]: Without dead ends: 1352 [2022-11-03 02:33:39,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2768 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=866, Invalid=11124, Unknown=0, NotChecked=0, Total=11990 [2022-11-03 02:33:39,864 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 146 mSDsluCounter, 1034 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 1000 SdHoareTripleChecker+Invalid, 1164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 547 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:39,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 1000 Invalid, 1164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 610 Invalid, 0 Unknown, 547 Unchecked, 0.5s Time] [2022-11-03 02:33:39,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1352 states. [2022-11-03 02:33:39,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1352 to 1176. [2022-11-03 02:33:39,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1176 states, 1172 states have (on average 1.2073378839590443) internal successors, (1415), 1175 states have internal predecessors, (1415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:39,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1176 states to 1176 states and 1415 transitions. [2022-11-03 02:33:39,880 INFO L78 Accepts]: Start accepts. Automaton has 1176 states and 1415 transitions. Word has length 54 [2022-11-03 02:33:39,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:39,880 INFO L495 AbstractCegarLoop]: Abstraction has 1176 states and 1415 transitions. [2022-11-03 02:33:39,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.339622641509434) internal successors, (124), 53 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:39,881 INFO L276 IsEmpty]: Start isEmpty. Operand 1176 states and 1415 transitions. [2022-11-03 02:33:39,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 02:33:39,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:39,882 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:33:39,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-03 02:33:40,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2022-11-03 02:33:40,083 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:33:40,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:40,083 INFO L85 PathProgramCache]: Analyzing trace with hash -443912104, now seen corresponding path program 4 times [2022-11-03 02:33:40,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:40,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205294006] [2022-11-03 02:33:40,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:40,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:40,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:40,457 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:33:40,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:40,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205294006] [2022-11-03 02:33:40,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205294006] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:33:40,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935433497] [2022-11-03 02:33:40,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:33:40,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:40,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:40,459 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:40,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-03 02:33:40,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:40,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-03 02:33:40,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:40,851 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:33:40,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:41,191 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:33:41,227 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:33:41,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935433497] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:41,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722140633] [2022-11-03 02:33:41,229 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:33:41,229 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:41,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:41,229 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:41,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:41,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:41,252 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:33:41,286 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:41,317 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:41,340 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:41,390 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:33:41,390 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:33:41,445 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:41,474 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:41,540 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:33:41,540 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:33:42,288 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:33:49,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66495#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:33:49,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:33:49,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:33:49,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-03 02:33:49,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448608695] [2022-11-03 02:33:49,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:33:49,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:33:49,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:33:49,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:33:49,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1685, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:33:49,937 INFO L87 Difference]: Start difference. First operand 1176 states and 1415 transitions. Second operand has 22 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:50,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:33:50,900 INFO L93 Difference]: Finished difference Result 1482 states and 1744 transitions. [2022-11-03 02:33:50,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 02:33:50,900 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2022-11-03 02:33:50,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:33:50,903 INFO L225 Difference]: With dead ends: 1482 [2022-11-03 02:33:50,903 INFO L226 Difference]: Without dead ends: 1482 [2022-11-03 02:33:50,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 120 SyntacticMatches, 9 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=402, Invalid=2904, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 02:33:50,904 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 301 mSDsluCounter, 453 mSDsCounter, 0 mSdLazyCounter, 828 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 852 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:33:50,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [301 Valid, 405 Invalid, 852 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 828 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:33:50,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1482 states. [2022-11-03 02:33:50,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1482 to 1176. [2022-11-03 02:33:50,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1176 states, 1172 states have (on average 1.204778156996587) internal successors, (1412), 1175 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:50,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1176 states to 1176 states and 1412 transitions. [2022-11-03 02:33:50,917 INFO L78 Accepts]: Start accepts. Automaton has 1176 states and 1412 transitions. Word has length 54 [2022-11-03 02:33:50,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:33:50,917 INFO L495 AbstractCegarLoop]: Abstraction has 1176 states and 1412 transitions. [2022-11-03 02:33:50,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.761904761904762) internal successors, (79), 21 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:33:50,918 INFO L276 IsEmpty]: Start isEmpty. Operand 1176 states and 1412 transitions. [2022-11-03 02:33:50,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-03 02:33:50,919 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:33:50,919 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:33:50,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-03 02:33:51,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:51,121 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:33:51,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:33:51,121 INFO L85 PathProgramCache]: Analyzing trace with hash -876371259, now seen corresponding path program 1 times [2022-11-03 02:33:51,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:33:51,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037347831] [2022-11-03 02:33:51,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:51,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:33:51,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:51,575 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 12 proven. 23 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 02:33:51,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:33:51,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037347831] [2022-11-03 02:33:51,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037347831] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:33:51,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961199005] [2022-11-03 02:33:51,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:33:51,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:33:51,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:33:51,576 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:33:51,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-03 02:33:51,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:33:51,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 02:33:51,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:33:52,031 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 02:33:52,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:33:52,326 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:33:52,412 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 02:33:52,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961199005] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:33:52,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1726308691] [2022-11-03 02:33:52,413 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:33:52,413 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:33:52,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:33:52,413 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:33:52,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:33:52,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:33:52,444 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:33:52,470 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:52,501 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:52,524 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:33:52,570 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:33:52,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:33:52,638 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:52,669 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:33:52,720 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:33:52,720 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:33:53,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:34:01,312 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69558#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_#t~post5#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:34:01,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:34:01,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:34:01,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 30 [2022-11-03 02:34:01,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937621886] [2022-11-03 02:34:01,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:34:01,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-03 02:34:01,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:34:01,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-03 02:34:01,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=2465, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 02:34:01,314 INFO L87 Difference]: Start difference. First operand 1176 states and 1412 transitions. Second operand has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 31 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:02,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:34:02,972 INFO L93 Difference]: Finished difference Result 2594 states and 2992 transitions. [2022-11-03 02:34:02,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-03 02:34:02,972 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 31 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2022-11-03 02:34:02,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:34:02,976 INFO L225 Difference]: With dead ends: 2594 [2022-11-03 02:34:02,976 INFO L226 Difference]: Without dead ends: 2594 [2022-11-03 02:34:02,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 117 SyntacticMatches, 9 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1868 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=865, Invalid=4835, Unknown=0, NotChecked=0, Total=5700 [2022-11-03 02:34:02,977 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 729 mSDsluCounter, 761 mSDsCounter, 0 mSdLazyCounter, 1020 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 729 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 1072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1020 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:34:02,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [729 Valid, 726 Invalid, 1072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1020 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:34:02,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2594 states. [2022-11-03 02:34:03,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2594 to 1672. [2022-11-03 02:34:03,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1668 states have (on average 1.2020383693045564) internal successors, (2005), 1671 states have internal predecessors, (2005), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:03,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 2005 transitions. [2022-11-03 02:34:03,005 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 2005 transitions. Word has length 55 [2022-11-03 02:34:03,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:34:03,005 INFO L495 AbstractCegarLoop]: Abstraction has 1672 states and 2005 transitions. [2022-11-03 02:34:03,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 31 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:03,006 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 2005 transitions. [2022-11-03 02:34:03,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-03 02:34:03,007 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:34:03,007 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:34:03,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-03 02:34:03,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:03,208 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:34:03,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:34:03,209 INFO L85 PathProgramCache]: Analyzing trace with hash -1737795904, now seen corresponding path program 2 times [2022-11-03 02:34:03,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:34:03,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602237021] [2022-11-03 02:34:03,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:34:03,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:34:03,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:04,030 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 02:34:04,030 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:34:04,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602237021] [2022-11-03 02:34:04,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602237021] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:34:04,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564824147] [2022-11-03 02:34:04,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:34:04,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:04,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:34:04,031 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:34:04,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-03 02:34:04,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:34:04,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:34:04,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-03 02:34:04,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:34:04,406 INFO L356 Elim1Store]: treesize reduction 11, result has 50.0 percent of original size [2022-11-03 02:34:04,406 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-03 02:34:04,417 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:34:04,567 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2022-11-03 02:34:04,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 24 [2022-11-03 02:34:05,862 INFO L356 Elim1Store]: treesize reduction 4, result has 86.2 percent of original size [2022-11-03 02:34:05,863 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 35 [2022-11-03 02:34:06,016 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-03 02:34:06,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:34:07,249 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:07,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 36 [2022-11-03 02:34:07,271 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:07,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 62 treesize of output 59 [2022-11-03 02:34:07,292 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2022-11-03 02:34:07,857 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-03 02:34:07,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564824147] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:34:07,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470596890] [2022-11-03 02:34:07,859 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2022-11-03 02:34:07,859 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:34:07,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:34:07,859 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:34:07,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:34:07,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:07,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:34:07,917 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:34:07,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:07,974 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:34:08,025 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:34:08,026 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:34:08,073 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:08,109 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:08,155 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:34:08,155 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:34:12,560 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:34:27,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74267#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:34:27,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:34:27,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:34:27,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 44 [2022-11-03 02:34:27,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230982109] [2022-11-03 02:34:27,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:34:27,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-03 02:34:27,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:34:27,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-03 02:34:27,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=4811, Unknown=0, NotChecked=0, Total=5112 [2022-11-03 02:34:27,123 INFO L87 Difference]: Start difference. First operand 1672 states and 2005 transitions. Second operand has 45 states, 45 states have (on average 3.0) internal successors, (135), 44 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:29,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:34:29,411 INFO L93 Difference]: Finished difference Result 1958 states and 2309 transitions. [2022-11-03 02:34:29,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-03 02:34:29,411 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.0) internal successors, (135), 44 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-03 02:34:29,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:34:29,414 INFO L225 Difference]: With dead ends: 1958 [2022-11-03 02:34:29,414 INFO L226 Difference]: Without dead ends: 1930 [2022-11-03 02:34:29,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2481 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=557, Invalid=9343, Unknown=0, NotChecked=0, Total=9900 [2022-11-03 02:34:29,415 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 65 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 661 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:34:29,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 661 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 352 Invalid, 0 Unknown, 101 Unchecked, 0.3s Time] [2022-11-03 02:34:29,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2022-11-03 02:34:29,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1845. [2022-11-03 02:34:29,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1845 states, 1841 states have (on average 1.1906572514937535) internal successors, (2192), 1844 states have internal predecessors, (2192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:29,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1845 states to 1845 states and 2192 transitions. [2022-11-03 02:34:29,436 INFO L78 Accepts]: Start accepts. Automaton has 1845 states and 2192 transitions. Word has length 56 [2022-11-03 02:34:29,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:34:29,437 INFO L495 AbstractCegarLoop]: Abstraction has 1845 states and 2192 transitions. [2022-11-03 02:34:29,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.0) internal successors, (135), 44 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:29,437 INFO L276 IsEmpty]: Start isEmpty. Operand 1845 states and 2192 transitions. [2022-11-03 02:34:29,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-03 02:34:29,439 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:34:29,439 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:34:29,468 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-03 02:34:29,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:29,653 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:34:29,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:34:29,653 INFO L85 PathProgramCache]: Analyzing trace with hash 595423252, now seen corresponding path program 3 times [2022-11-03 02:34:29,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:34:29,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135840420] [2022-11-03 02:34:29,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:34:29,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:34:29,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:30,454 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:34:30,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:34:30,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135840420] [2022-11-03 02:34:30,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135840420] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:34:30,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425538005] [2022-11-03 02:34:30,454 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:34:30,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:30,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:34:30,456 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:34:30,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-03 02:34:30,705 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:34:30,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:34:30,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-03 02:34:30,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:34:31,063 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:31,141 INFO L356 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-11-03 02:34:31,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2022-11-03 02:34:32,511 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 02:34:32,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:34:35,410 WARN L833 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) 0))) (let ((.cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= .cse0 0) (not (= .cse0 (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse1) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)))) (= (select .cse1 (+ 2 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|)) 0))))) is different from false [2022-11-03 02:34:35,430 INFO L356 Elim1Store]: treesize reduction 19, result has 53.7 percent of original size [2022-11-03 02:34:35,430 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 229 treesize of output 178 [2022-11-03 02:34:35,440 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:35,440 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 174 treesize of output 166 [2022-11-03 02:34:35,467 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:34:35,467 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 22 [2022-11-03 02:34:35,474 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:35,474 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 23 [2022-11-03 02:34:35,877 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 02:34:35,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425538005] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:34:35,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057320236] [2022-11-03 02:34:35,879 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:34:35,879 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:34:35,879 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:34:35,879 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:34:35,879 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:34:35,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:34:35,903 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:34:35,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:35,970 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:35,992 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:34:36,042 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:34:36,042 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:34:36,100 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:36,131 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:36,179 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:34:36,179 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:34:37,463 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:34:49,012 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '78543#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:34:49,012 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:34:49,012 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:34:49,013 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 20, 21] total 55 [2022-11-03 02:34:49,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164741294] [2022-11-03 02:34:49,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:34:49,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 02:34:49,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:34:49,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 02:34:49,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=5699, Unknown=1, NotChecked=152, Total=6162 [2022-11-03 02:34:49,014 INFO L87 Difference]: Start difference. First operand 1845 states and 2192 transitions. Second operand has 56 states, 56 states have (on average 2.2857142857142856) internal successors, (128), 55 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:50,929 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse7 (div |c_ULTIMATE.start_main_~length1~0#1| 4294967296))) (let ((.cse0 (* .cse7 4294967296)) (.cse1 (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (let ((.cse4 (+ 3 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (.cse3 (+ .cse0 .cse1)) (.cse2 (<= (+ .cse7 1) 0))) (and (= 0 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 2 |ULTIMATE.start_main_~length1~0#1|) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length1~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0) (<= |ULTIMATE.start_main_~length1~0#1| 3))) (< 2 |c_ULTIMATE.start_main_~length1~0#1|) (or (<= (+ .cse0 .cse1 |c_ULTIMATE.start_main_~i~0#1|) (+ 3 |c_ULTIMATE.start_main_~length1~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) .cse2) (or (<= .cse3 .cse4) .cse2) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse6 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) 0))) (let ((.cse5 (select .cse6 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= .cse5 0) (not (= .cse5 (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse6) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)))) (= (select .cse6 (+ 2 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|)) 0))))) (or (<= .cse4 .cse3) (not .cse2)) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~length1~0#1| 3) (<= |c_ULTIMATE.start_main_~i~0#1| 3))))) is different from false [2022-11-03 02:34:52,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:34:52,199 INFO L93 Difference]: Finished difference Result 1854 states and 2200 transitions. [2022-11-03 02:34:52,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:34:52,200 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.2857142857142856) internal successors, (128), 55 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-03 02:34:52,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:34:52,202 INFO L225 Difference]: With dead ends: 1854 [2022-11-03 02:34:52,203 INFO L226 Difference]: Without dead ends: 1845 [2022-11-03 02:34:52,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 98 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=499, Invalid=9013, Unknown=2, NotChecked=386, Total=9900 [2022-11-03 02:34:52,204 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 42 mSDsluCounter, 952 mSDsCounter, 0 mSdLazyCounter, 591 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 839 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 591 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:34:52,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 839 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 591 Invalid, 0 Unknown, 142 Unchecked, 0.4s Time] [2022-11-03 02:34:52,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1845 states. [2022-11-03 02:34:52,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1845 to 1833. [2022-11-03 02:34:52,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1833 states, 1829 states have (on average 1.1897211591033352) internal successors, (2176), 1832 states have internal predecessors, (2176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:52,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1833 states to 1833 states and 2176 transitions. [2022-11-03 02:34:52,225 INFO L78 Accepts]: Start accepts. Automaton has 1833 states and 2176 transitions. Word has length 56 [2022-11-03 02:34:52,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:34:52,225 INFO L495 AbstractCegarLoop]: Abstraction has 1833 states and 2176 transitions. [2022-11-03 02:34:52,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.2857142857142856) internal successors, (128), 55 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:34:52,225 INFO L276 IsEmpty]: Start isEmpty. Operand 1833 states and 2176 transitions. [2022-11-03 02:34:52,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-03 02:34:52,227 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:34:52,227 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:34:52,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-03 02:34:52,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:52,437 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:34:52,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:34:52,437 INFO L85 PathProgramCache]: Analyzing trace with hash 864856614, now seen corresponding path program 9 times [2022-11-03 02:34:52,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:34:52,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969386526] [2022-11-03 02:34:52,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:34:52,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:34:52,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:34:54,653 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:34:54,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:34:54,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969386526] [2022-11-03 02:34:54,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969386526] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:34:54,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689108808] [2022-11-03 02:34:54,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:34:54,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:34:54,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:34:54,655 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:34:54,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-03 02:34:54,894 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:34:54,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:34:54,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 127 conjunts are in the unsatisfiable core [2022-11-03 02:34:54,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:34:55,771 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:34:55,879 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:34:55,879 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 23 [2022-11-03 02:34:55,884 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 3 [2022-11-03 02:34:57,506 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:34:57,514 INFO L356 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2022-11-03 02:34:57,514 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 21 [2022-11-03 02:34:57,581 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 40 proven. 95 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:34:57,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:34:58,641 WARN L833 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_2343 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2343) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= 0 (select v_ArrVal_2343 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (= (select .cse0 (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)))) is different from false [2022-11-03 02:34:58,649 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:58,649 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 36 [2022-11-03 02:34:58,661 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:58,661 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 59 [2022-11-03 02:34:58,676 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:34:58,676 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 37 [2022-11-03 02:35:00,185 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 47 proven. 87 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:35:00,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689108808] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:00,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592324079] [2022-11-03 02:35:00,186 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:35:00,186 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:00,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:00,186 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:00,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:00,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:00,215 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:35:00,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:00,267 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:00,293 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:00,333 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:35:00,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:00,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:00,464 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:35:00,464 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:35:00,821 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:08,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82715#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:08,473 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:08,473 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:08,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 26] total 79 [2022-11-03 02:35:08,473 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319392853] [2022-11-03 02:35:08,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:08,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-03 02:35:08,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:08,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-03 02:35:08,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=8765, Unknown=1, NotChecked=188, Total=9312 [2022-11-03 02:35:08,475 INFO L87 Difference]: Start difference. First operand 1833 states and 2176 transitions. Second operand has 80 states, 80 states have (on average 2.0125) internal successors, (161), 79 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:13,063 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse16 (div |c_ULTIMATE.start_main_~length2~0#1| 4294967296))) (let ((.cse14 (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (.cse15 (* .cse16 4294967296)) (.cse5 (<= (+ .cse16 1) 0))) (let ((.cse8 (= |c_ULTIMATE.start_main_~nondetString1~0#1.base| |c_ULTIMATE.start_main_~nondetString2~0#1.base|)) (.cse2 (not .cse5)) (.cse13 (+ 2 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (.cse4 (+ .cse14 .cse15)) (.cse10 (+ |c_ULTIMATE.start_main_~i~1#1| .cse14 .cse15)) (.cse9 (+ |c_ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1))) (let ((.cse1 (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (.cse11 (or .cse5 (<= .cse10 .cse9))) (.cse7 (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (.cse12 (or .cse2 (<= .cse13 .cse4))) (.cse6 (not .cse8))) (and (= 0 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_2343 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2343) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= 0 (select v_ArrVal_2343 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (= (select .cse0 .cse1) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)))) (< 1 |c_ULTIMATE.start_main_~length2~0#1|) (= 6 |c_ULTIMATE.start_main_~length1~0#1|) (or (let ((.cse3 (+ |c_ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|))) (and (or .cse2 (<= .cse3 .cse4)) (or (<= .cse4 .cse3) .cse5) (= |c_ULTIMATE.start_main_~i~1#1| 0))) .cse6) (< 5 |c_ULTIMATE.start_main_~length1~0#1|) (or (= (select .cse7 .cse1) 0) .cse8) (or .cse6 (and (or (<= .cse9 .cse10) .cse2) .cse11)) (<= |c_ULTIMATE.start_main_~length1~0#1| 6) (or (and .cse11 .cse12) .cse6) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 5 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 6) (= (select .cse7 (+ (- 1) |ULTIMATE.start_main_~length1~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0))) (<= |c_ULTIMATE.start_main_~i~1#1| 2) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (or (and .cse12 (or .cse5 (<= .cse4 .cse13))) .cse6) (<= |c_ULTIMATE.start_main_~i~0#1| 6)))))) is different from false [2022-11-03 02:35:13,490 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse2 (+ |c_ULTIMATE.start_main_~i~0#1| 1)) (.cse1 (or (let ((.cse6 (div |c_ULTIMATE.start_main_~length2~0#1| 4294967296))) (let ((.cse5 (+ (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (* .cse6 4294967296))) (.cse4 (+ |c_ULTIMATE.start_main_~length2~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (.cse3 (<= (+ .cse6 1) 0))) (and (or (not .cse3) (<= .cse4 .cse5)) (or (<= .cse5 .cse4) .cse3)))) (not (= |c_ULTIMATE.start_main_~nondetString1~0#1.base| |c_ULTIMATE.start_main_~nondetString2~0#1.base|))))) (and (= 0 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_2343 (Array Int Int))) (let ((.cse0 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2343) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= 0 (select v_ArrVal_2343 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (= (select .cse0 (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0) (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)))) (or (and .cse1 (<= 5 |c_ULTIMATE.start_main_~i~0#1|) (<= |c_ULTIMATE.start_main_~i~0#1| 5)) (not (= .cse2 |c_ULTIMATE.start_main_~length1~0#1|))) (< 5 |c_ULTIMATE.start_main_~length1~0#1|) (<= |c_ULTIMATE.start_main_~length1~0#1| 6) (or (<= .cse2 |c_ULTIMATE.start_main_~length1~0#1|) (and .cse1 (= 6 |c_ULTIMATE.start_main_~length1~0#1|))) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 5 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 6) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~length1~0#1| |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0))) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 6))) is different from false [2022-11-03 02:35:15,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:15,743 INFO L93 Difference]: Finished difference Result 2929 states and 3481 transitions. [2022-11-03 02:35:15,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-03 02:35:15,744 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.0125) internal successors, (161), 79 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2022-11-03 02:35:15,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:15,746 INFO L225 Difference]: With dead ends: 2929 [2022-11-03 02:35:15,746 INFO L226 Difference]: Without dead ends: 2887 [2022-11-03 02:35:15,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 3652 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=694, Invalid=16345, Unknown=3, NotChecked=780, Total=17822 [2022-11-03 02:35:15,747 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 407 mSDsluCounter, 2814 mSDsCounter, 0 mSdLazyCounter, 3255 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 2445 SdHoareTripleChecker+Invalid, 4591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 3255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1280 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:15,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [407 Valid, 2445 Invalid, 4591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 3255 Invalid, 0 Unknown, 1280 Unchecked, 2.5s Time] [2022-11-03 02:35:15,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2887 states. [2022-11-03 02:35:15,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2887 to 1888. [2022-11-03 02:35:15,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1888 states, 1884 states have (on average 1.1878980891719746) internal successors, (2238), 1887 states have internal predecessors, (2238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:15,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1888 states to 1888 states and 2238 transitions. [2022-11-03 02:35:15,763 INFO L78 Accepts]: Start accepts. Automaton has 1888 states and 2238 transitions. Word has length 57 [2022-11-03 02:35:15,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:15,764 INFO L495 AbstractCegarLoop]: Abstraction has 1888 states and 2238 transitions. [2022-11-03 02:35:15,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.0125) internal successors, (161), 79 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:15,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1888 states and 2238 transitions. [2022-11-03 02:35:15,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-03 02:35:15,765 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:15,765 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:15,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:15,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-11-03 02:35:15,966 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:35:15,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:15,966 INFO L85 PathProgramCache]: Analyzing trace with hash -1917871842, now seen corresponding path program 7 times [2022-11-03 02:35:15,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:15,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298124828] [2022-11-03 02:35:15,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:15,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:15,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:17,935 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:35:17,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:17,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298124828] [2022-11-03 02:35:17,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298124828] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:17,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240048898] [2022-11-03 02:35:17,935 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:35:17,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:17,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:17,936 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:17,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-03 02:35:18,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:18,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-03 02:35:18,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:18,173 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:35:18,662 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:18,742 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:35:19,505 INFO L356 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-03 02:35:19,505 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-03 02:35:19,554 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:19,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:19,975 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2401 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2401) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 02:35:19,981 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:35:19,981 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:35:19,987 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:35:19,988 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:35:20,313 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:20,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240048898] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:20,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543824686] [2022-11-03 02:35:20,314 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:35:20,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:20,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:20,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:20,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:20,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:20,342 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:35:20,366 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:20,398 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:20,420 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:35:20,473 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:35:20,474 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:35:20,527 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:20,553 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:20,597 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:35:20,598 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:35:21,000 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:26,353 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88017#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:26,353 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:26,354 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:26,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 19, 19] total 55 [2022-11-03 02:35:26,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486134204] [2022-11-03 02:35:26,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:26,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 02:35:26,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:26,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 02:35:26,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=4580, Unknown=1, NotChecked=136, Total=4970 [2022-11-03 02:35:26,355 INFO L87 Difference]: Start difference. First operand 1888 states and 2238 transitions. Second operand has 56 states, 56 states have (on average 2.5357142857142856) internal successors, (142), 55 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:30,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:30,288 INFO L93 Difference]: Finished difference Result 2529 states and 2974 transitions. [2022-11-03 02:35:30,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-03 02:35:30,288 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.5357142857142856) internal successors, (142), 55 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2022-11-03 02:35:30,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:30,290 INFO L225 Difference]: With dead ends: 2529 [2022-11-03 02:35:30,290 INFO L226 Difference]: Without dead ends: 2454 [2022-11-03 02:35:30,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 87 ConstructedPredicates, 1 IntricatePredicates, 7 DeprecatedPredicates, 2396 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=379, Invalid=7280, Unknown=1, NotChecked=172, Total=7832 [2022-11-03 02:35:30,291 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 416 mSDsluCounter, 3421 mSDsCounter, 0 mSdLazyCounter, 3507 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 2917 SdHoareTripleChecker+Invalid, 4102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 3507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 579 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:30,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [416 Valid, 2917 Invalid, 4102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 3507 Invalid, 0 Unknown, 579 Unchecked, 2.6s Time] [2022-11-03 02:35:30,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2454 states. [2022-11-03 02:35:30,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2454 to 2113. [2022-11-03 02:35:30,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2113 states, 2109 states have (on average 1.19108582266477) internal successors, (2512), 2112 states have internal predecessors, (2512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:30,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2113 states to 2113 states and 2512 transitions. [2022-11-03 02:35:30,315 INFO L78 Accepts]: Start accepts. Automaton has 2113 states and 2512 transitions. Word has length 57 [2022-11-03 02:35:30,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:30,315 INFO L495 AbstractCegarLoop]: Abstraction has 2113 states and 2512 transitions. [2022-11-03 02:35:30,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.5357142857142856) internal successors, (142), 55 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:30,315 INFO L276 IsEmpty]: Start isEmpty. Operand 2113 states and 2512 transitions. [2022-11-03 02:35:30,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-03 02:35:30,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:30,317 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:30,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-11-03 02:35:30,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-03 02:35:30,517 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:35:30,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:30,518 INFO L85 PathProgramCache]: Analyzing trace with hash -1068357871, now seen corresponding path program 1 times [2022-11-03 02:35:30,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:30,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743631146] [2022-11-03 02:35:30,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:30,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:30,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:30,900 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 41 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:30,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:30,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743631146] [2022-11-03 02:35:30,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743631146] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:30,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86242717] [2022-11-03 02:35:30,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:30,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:30,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:30,902 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:30,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-03 02:35:31,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:31,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-03 02:35:31,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:31,322 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 20 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:31,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:31,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-03 02:35:31,744 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 20 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:31,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86242717] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:31,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1034121804] [2022-11-03 02:35:31,746 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-03 02:35:31,746 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:31,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:31,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:31,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:31,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:31,775 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:35:31,802 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:31,835 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:31,859 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:35:31,907 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:35:31,907 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:35:31,956 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:31,990 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:32,039 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:35:32,039 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:35:32,823 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:35:42,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '93077#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:35:42,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:35:42,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:35:42,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2022-11-03 02:35:42,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337223636] [2022-11-03 02:35:42,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:35:42,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 02:35:42,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:35:42,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 02:35:42,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=2074, Unknown=0, NotChecked=0, Total=2352 [2022-11-03 02:35:42,872 INFO L87 Difference]: Start difference. First operand 2113 states and 2512 transitions. Second operand has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 24 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:44,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:35:44,413 INFO L93 Difference]: Finished difference Result 2515 states and 2941 transitions. [2022-11-03 02:35:44,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 02:35:44,414 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 24 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-03 02:35:44,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:35:44,417 INFO L225 Difference]: With dead ends: 2515 [2022-11-03 02:35:44,417 INFO L226 Difference]: Without dead ends: 2446 [2022-11-03 02:35:44,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1017 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=526, Invalid=3764, Unknown=0, NotChecked=0, Total=4290 [2022-11-03 02:35:44,418 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 517 mSDsluCounter, 950 mSDsCounter, 0 mSdLazyCounter, 1678 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 840 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:35:44,419 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [517 Valid, 840 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1678 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 02:35:44,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2446 states. [2022-11-03 02:35:44,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2446 to 2106. [2022-11-03 02:35:44,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2106 states, 2102 states have (on average 1.1907706945765937) internal successors, (2503), 2105 states have internal predecessors, (2503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:44,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2106 states to 2106 states and 2503 transitions. [2022-11-03 02:35:44,453 INFO L78 Accepts]: Start accepts. Automaton has 2106 states and 2503 transitions. Word has length 58 [2022-11-03 02:35:44,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:35:44,454 INFO L495 AbstractCegarLoop]: Abstraction has 2106 states and 2503 transitions. [2022-11-03 02:35:44,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.208333333333333) internal successors, (101), 24 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:35:44,454 INFO L276 IsEmpty]: Start isEmpty. Operand 2106 states and 2503 transitions. [2022-11-03 02:35:44,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-03 02:35:44,456 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:35:44,456 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:35:44,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-03 02:35:44,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:44,681 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:35:44,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:35:44,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1626756432, now seen corresponding path program 4 times [2022-11-03 02:35:44,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:35:44,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388573949] [2022-11-03 02:35:44,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:35:44,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:35:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:45,312 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 3 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:35:45,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:35:45,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388573949] [2022-11-03 02:35:45,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388573949] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:35:45,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025320570] [2022-11-03 02:35:45,313 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:35:45,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:35:45,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:35:45,314 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:35:45,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-03 02:35:45,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:35:45,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 140 conjunts are in the unsatisfiable core [2022-11-03 02:35:45,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:35:45,976 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:46,054 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:35:46,054 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 23 [2022-11-03 02:35:46,061 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 3 [2022-11-03 02:35:47,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:47,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:47,801 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:35:47,813 INFO L356 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2022-11-03 02:35:47,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 44 treesize of output 25 [2022-11-03 02:35:47,880 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 5 proven. 49 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:35:47,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:35:49,059 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:35:49,059 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 41 [2022-11-03 02:35:49,072 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:35:49,072 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 72 [2022-11-03 02:35:49,096 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:35:49,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 75 [2022-11-03 02:35:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 13 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-03 02:35:50,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025320570] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:35:50,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136001820] [2022-11-03 02:35:50,111 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:35:50,111 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:35:50,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:35:50,111 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:35:50,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:35:50,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:35:50,133 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:35:50,161 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:35:50,195 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:50,218 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:35:50,268 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:35:50,268 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:35:50,322 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:50,359 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:35:50,409 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:35:50,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:35:51,714 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:03,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98164#(and (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|))) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~n#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:36:03,357 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:03,358 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:03,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 26, 24] total 65 [2022-11-03 02:36:03,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776708471] [2022-11-03 02:36:03,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:03,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-03 02:36:03,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:03,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-03 02:36:03,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=7500, Unknown=2, NotChecked=0, Total=7832 [2022-11-03 02:36:03,359 INFO L87 Difference]: Start difference. First operand 2106 states and 2503 transitions. Second operand has 66 states, 66 states have (on average 2.1363636363636362) internal successors, (141), 65 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:06,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:06,142 INFO L93 Difference]: Finished difference Result 2296 states and 2708 transitions. [2022-11-03 02:36:06,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 02:36:06,143 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.1363636363636362) internal successors, (141), 65 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-03 02:36:06,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:06,146 INFO L225 Difference]: With dead ends: 2296 [2022-11-03 02:36:06,146 INFO L226 Difference]: Without dead ends: 2281 [2022-11-03 02:36:06,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3077 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=548, Invalid=12560, Unknown=2, NotChecked=0, Total=13110 [2022-11-03 02:36:06,148 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 170 mSDsluCounter, 1818 mSDsCounter, 0 mSdLazyCounter, 1276 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 1437 SdHoareTripleChecker+Invalid, 2055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 756 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:06,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 1437 Invalid, 2055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1276 Invalid, 0 Unknown, 756 Unchecked, 0.8s Time] [2022-11-03 02:36:06,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2281 states. [2022-11-03 02:36:06,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2281 to 2106. [2022-11-03 02:36:06,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2106 states, 2102 states have (on average 1.1902949571836345) internal successors, (2502), 2105 states have internal predecessors, (2502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:06,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2106 states to 2106 states and 2502 transitions. [2022-11-03 02:36:06,172 INFO L78 Accepts]: Start accepts. Automaton has 2106 states and 2502 transitions. Word has length 58 [2022-11-03 02:36:06,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:06,173 INFO L495 AbstractCegarLoop]: Abstraction has 2106 states and 2502 transitions. [2022-11-03 02:36:06,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.1363636363636362) internal successors, (141), 65 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:06,173 INFO L276 IsEmpty]: Start isEmpty. Operand 2106 states and 2502 transitions. [2022-11-03 02:36:06,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:36:06,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:06,175 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:06,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-11-03 02:36:06,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-11-03 02:36:06,401 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:36:06,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:06,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1523553174, now seen corresponding path program 10 times [2022-11-03 02:36:06,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:06,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002751603] [2022-11-03 02:36:06,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:06,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:06,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:07,351 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 20 proven. 127 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:36:07,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:07,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002751603] [2022-11-03 02:36:07,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002751603] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:36:07,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903185675] [2022-11-03 02:36:07,351 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:36:07,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:07,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:07,352 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:07,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-03 02:36:07,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:07,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 101 conjunts are in the unsatisfiable core [2022-11-03 02:36:07,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:07,593 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:36:07,883 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:36:07,892 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-03 02:36:08,231 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-03 02:36:08,234 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 20 proven. 127 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:36:08,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:08,329 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2567 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2567) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 6 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 02:36:08,334 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:36:08,335 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-03 02:36:08,341 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:36:08,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-03 02:36:08,345 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-03 02:36:08,850 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 20 proven. 127 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:36:08,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903185675] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:08,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94309415] [2022-11-03 02:36:08,851 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:36:08,852 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:08,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:08,852 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:08,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:08,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:08,876 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:36:08,905 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:08,935 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:08,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:09,011 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:36:09,055 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:09,089 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:09,135 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:36:09,135 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:36:09,466 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:15,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103037#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= |ULTIMATE.start_cstrlen_#res#1| 1) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:15,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:15,575 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:15,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 44 [2022-11-03 02:36:15,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710165946] [2022-11-03 02:36:15,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:15,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-03 02:36:15,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:15,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-03 02:36:15,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=3443, Unknown=1, NotChecked=118, Total=3782 [2022-11-03 02:36:15,576 INFO L87 Difference]: Start difference. First operand 2106 states and 2502 transitions. Second operand has 45 states, 45 states have (on average 2.577777777777778) internal successors, (116), 44 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:18,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:18,676 INFO L93 Difference]: Finished difference Result 3839 states and 4556 transitions. [2022-11-03 02:36:18,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-03 02:36:18,677 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.577777777777778) internal successors, (116), 44 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-03 02:36:18,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:18,684 INFO L225 Difference]: With dead ends: 3839 [2022-11-03 02:36:18,684 INFO L226 Difference]: Without dead ends: 3797 [2022-11-03 02:36:18,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1579 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=435, Invalid=6210, Unknown=1, NotChecked=160, Total=6806 [2022-11-03 02:36:18,686 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 1097 mSDsluCounter, 4436 mSDsCounter, 0 mSdLazyCounter, 3508 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1097 SdHoareTripleChecker+Valid, 3726 SdHoareTripleChecker+Invalid, 3863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 3508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 307 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:18,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1097 Valid, 3726 Invalid, 3863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 3508 Invalid, 0 Unknown, 307 Unchecked, 2.0s Time] [2022-11-03 02:36:18,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3797 states. [2022-11-03 02:36:18,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3797 to 2967. [2022-11-03 02:36:18,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2967 states, 2963 states have (on average 1.196422544718191) internal successors, (3545), 2966 states have internal predecessors, (3545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:18,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2967 states to 2967 states and 3545 transitions. [2022-11-03 02:36:18,722 INFO L78 Accepts]: Start accepts. Automaton has 2967 states and 3545 transitions. Word has length 59 [2022-11-03 02:36:18,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:18,722 INFO L495 AbstractCegarLoop]: Abstraction has 2967 states and 3545 transitions. [2022-11-03 02:36:18,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.577777777777778) internal successors, (116), 44 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:36:18,723 INFO L276 IsEmpty]: Start isEmpty. Operand 2967 states and 3545 transitions. [2022-11-03 02:36:18,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-03 02:36:18,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:18,725 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:18,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:18,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:18,945 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:36:18,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:18,945 INFO L85 PathProgramCache]: Analyzing trace with hash -11314334, now seen corresponding path program 8 times [2022-11-03 02:36:18,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:18,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674466207] [2022-11-03 02:36:18,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:18,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:18,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:19,461 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 30 proven. 91 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-03 02:36:19,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:19,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674466207] [2022-11-03 02:36:19,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674466207] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:36:19,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051816483] [2022-11-03 02:36:19,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:36:19,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:19,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:19,465 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:19,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-03 02:36:19,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 02:36:19,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:36:19,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 125 conjunts are in the unsatisfiable core [2022-11-03 02:36:19,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:20,418 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:20,501 INFO L356 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-11-03 02:36:20,502 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2022-11-03 02:36:22,504 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 02:36:22,617 INFO L356 Elim1Store]: treesize reduction 68, result has 54.4 percent of original size [2022-11-03 02:36:22,617 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 102 [2022-11-03 02:36:23,128 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 12 proven. 108 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:36:23,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:29,051 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:36:29,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 185 treesize of output 223 [2022-11-03 02:36:29,086 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:36:30,230 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 4 proven. 110 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 02:36:30,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051816483] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:30,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866968662] [2022-11-03 02:36:30,232 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:36:30,232 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:30,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:30,232 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:30,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:30,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:36:30,251 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:36:30,277 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:30,312 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:30,334 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:36:30,381 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:36:30,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:36:30,433 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:30,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:36:30,519 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:36:30,519 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:36:30,898 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:37,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '110325#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:37,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:37,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:36:37,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 31, 25] total 73 [2022-11-03 02:36:37,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077817204] [2022-11-03 02:36:37,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:37,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-03 02:36:37,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:37,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-03 02:36:37,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=7339, Unknown=0, NotChecked=0, Total=8010 [2022-11-03 02:36:37,291 INFO L87 Difference]: Start difference. First operand 2967 states and 3545 transitions. Second operand has 75 states, 74 states have (on average 2.1486486486486487) internal successors, (159), 74 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:16,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:16,134 INFO L93 Difference]: Finished difference Result 3174 states and 3773 transitions. [2022-11-03 02:37:16,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2022-11-03 02:37:16,134 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 2.1486486486486487) internal successors, (159), 74 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-11-03 02:37:16,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:16,137 INFO L225 Difference]: With dead ends: 3174 [2022-11-03 02:37:16,137 INFO L226 Difference]: Without dead ends: 3170 [2022-11-03 02:37:16,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 111 SyntacticMatches, 14 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9809 ImplicationChecksByTransitivity, 52.0s TimeCoverageRelationStatistics Valid=2868, Invalid=28988, Unknown=6, NotChecked=0, Total=31862 [2022-11-03 02:37:16,139 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 313 mSDsluCounter, 1625 mSDsCounter, 0 mSdLazyCounter, 1280 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 1594 SdHoareTripleChecker+Invalid, 2467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1136 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:16,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [313 Valid, 1594 Invalid, 2467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1280 Invalid, 0 Unknown, 1136 Unchecked, 0.9s Time] [2022-11-03 02:37:16,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3170 states. [2022-11-03 02:37:16,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3170 to 3031. [2022-11-03 02:37:16,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3031 states, 3027 states have (on average 1.195242814667988) internal successors, (3618), 3030 states have internal predecessors, (3618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:16,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3031 states to 3031 states and 3618 transitions. [2022-11-03 02:37:16,170 INFO L78 Accepts]: Start accepts. Automaton has 3031 states and 3618 transitions. Word has length 59 [2022-11-03 02:37:16,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:37:16,170 INFO L495 AbstractCegarLoop]: Abstraction has 3031 states and 3618 transitions. [2022-11-03 02:37:16,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 2.1486486486486487) internal successors, (159), 74 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:16,171 INFO L276 IsEmpty]: Start isEmpty. Operand 3031 states and 3618 transitions. [2022-11-03 02:37:16,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 02:37:16,173 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:37:16,173 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:37:16,210 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-11-03 02:37:16,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:16,388 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:37:16,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:37:16,388 INFO L85 PathProgramCache]: Analyzing trace with hash 600497036, now seen corresponding path program 5 times [2022-11-03 02:37:16,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:37:16,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724147609] [2022-11-03 02:37:16,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:37:16,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:37:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:37:16,861 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 02:37:16,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:37:16,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724147609] [2022-11-03 02:37:16,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724147609] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:37:16,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70206875] [2022-11-03 02:37:16,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:37:16,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:16,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:37:16,863 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:37:16,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-03 02:37:17,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:37:17,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:37:17,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 127 conjunts are in the unsatisfiable core [2022-11-03 02:37:17,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:37:17,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:37:17,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:17,439 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-03 02:37:19,588 INFO L356 Elim1Store]: treesize reduction 12, result has 86.5 percent of original size [2022-11-03 02:37:19,588 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 54 treesize of output 98 [2022-11-03 02:37:19,972 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-03 02:37:19,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:37:27,082 WARN L833 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_cstrncmp_~s1#1.offset_129| Int) (|v_ULTIMATE.start_cstrstr_#t~post17#1.offset_411| Int) (v_ArrVal_2691 (Array Int Int)) (|v_ULTIMATE.start_cstrncmp_~s1#1.offset_127| Int)) (let ((.cse0 (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2691) |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (.cse1 (select v_ArrVal_2691 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= (select .cse0 (+ (- 1) |v_ULTIMATE.start_cstrncmp_~s1#1.offset_127|)) 0) (< (+ 2 |v_ULTIMATE.start_cstrncmp_~s1#1.offset_129|) |v_ULTIMATE.start_cstrncmp_~s1#1.offset_127|) (= (select .cse0 |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_411|) 0) (= (select .cse0 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0) (< (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1) |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_411|) (not (<= 1 |v_ULTIMATE.start_cstrncmp_~s1#1.offset_127|)) (not (= .cse1 (select .cse0 |v_ULTIMATE.start_cstrncmp_~s1#1.offset_129|))) (< (+ |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_411| 1) |v_ULTIMATE.start_cstrncmp_~s1#1.offset_129|) (= .cse1 0) (<= (+ |v_ULTIMATE.start_cstrncmp_~s1#1.offset_127| 1) (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|))))) is different from false [2022-11-03 02:37:27,104 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:27,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 92 treesize of output 59 [2022-11-03 02:37:27,179 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:27,179 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 111 treesize of output 182 [2022-11-03 02:37:27,272 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:27,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 65 treesize of output 137 [2022-11-03 02:37:27,292 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-03 02:37:32,658 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 17 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-11-03 02:37:32,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70206875] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:37:32,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180369887] [2022-11-03 02:37:32,660 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:37:32,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:37:32,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:37:32,660 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:37:32,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:37:32,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:37:32,681 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:37:32,708 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:37:32,738 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:32,764 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:32,800 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 81 treesize of output 73 [2022-11-03 02:37:32,846 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:32,876 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:32,924 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:37:32,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:37:34,228 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:37:45,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '117154#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#in~n#1|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))) (not (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|))))' at error location [2022-11-03 02:37:45,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:37:45,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:37:45,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21, 20] total 54 [2022-11-03 02:37:45,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100769985] [2022-11-03 02:37:45,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:37:45,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-03 02:37:45,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:37:45,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-03 02:37:45,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=5631, Unknown=3, NotChecked=152, Total=6162 [2022-11-03 02:37:45,944 INFO L87 Difference]: Start difference. First operand 3031 states and 3618 transitions. Second operand has 56 states, 55 states have (on average 2.381818181818182) internal successors, (131), 55 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:51,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:51,673 INFO L93 Difference]: Finished difference Result 3255 states and 3862 transitions. [2022-11-03 02:37:51,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-03 02:37:51,674 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 2.381818181818182) internal successors, (131), 55 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-03 02:37:51,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:51,678 INFO L225 Difference]: With dead ends: 3255 [2022-11-03 02:37:51,678 INFO L226 Difference]: Without dead ends: 3255 [2022-11-03 02:37:51,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 123 SyntacticMatches, 5 SemanticMatches, 110 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3006 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=801, Invalid=11410, Unknown=3, NotChecked=218, Total=12432 [2022-11-03 02:37:51,680 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 98 mSDsluCounter, 747 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 675 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:51,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 690 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 167 Invalid, 0 Unknown, 675 Unchecked, 0.1s Time] [2022-11-03 02:37:51,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3255 states. [2022-11-03 02:37:51,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3255 to 3164. [2022-11-03 02:37:51,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3164 states, 3160 states have (on average 1.1930379746835442) internal successors, (3770), 3163 states have internal predecessors, (3770), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:51,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3164 states to 3164 states and 3770 transitions. [2022-11-03 02:37:51,716 INFO L78 Accepts]: Start accepts. Automaton has 3164 states and 3770 transitions. Word has length 60 [2022-11-03 02:37:51,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:37:51,716 INFO L495 AbstractCegarLoop]: Abstraction has 3164 states and 3770 transitions. [2022-11-03 02:37:51,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 2.381818181818182) internal successors, (131), 55 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 02:37:51,717 INFO L276 IsEmpty]: Start isEmpty. Operand 3164 states and 3770 transitions. [2022-11-03 02:37:51,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 02:37:51,719 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:37:51,719 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:37:51,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-11-03 02:37:51,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable72 [2022-11-03 02:37:51,945 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 22 more)] === [2022-11-03 02:37:51,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:37:51,945 INFO L85 PathProgramCache]: Analyzing trace with hash -608263889, now seen corresponding path program 5 times [2022-11-03 02:37:51,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:37:51,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438587802] [2022-11-03 02:37:51,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:37:51,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:37:51,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:37:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-03 02:37:52,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:37:52,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438587802] [2022-11-03 02:37:52,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438587802] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:37:52,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567943905] [2022-11-03 02:37:52,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:37:52,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:37:52,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:37:52,255 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:37:52,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7501256e-da7e-4d57-bb56-6429223d094e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-03 02:37:52,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:37:52,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:37:52,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 123 conjunts are in the unsatisfiable core [2022-11-03 02:37:52,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:37:52,556 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 02:37:52,556 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-03 02:37:52,570 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-03 02:37:52,898 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-03 02:37:52,969 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-03 02:37:54,843 INFO L356 Elim1Store]: treesize reduction 16, result has 69.8 percent of original size [2022-11-03 02:37:54,843 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 49 treesize of output 54 [2022-11-03 02:37:55,112 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-03 02:37:55,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:37:57,023 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:57,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 73 treesize of output 51 [2022-11-03 02:37:57,059 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:57,059 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 94 treesize of output 117 [2022-11-03 02:37:57,102 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 02:37:57,102 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 58 treesize of output 84 [2022-11-03 02:37:58,228 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-03 02:37:58,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567943905] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:37:58,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1223666375] [2022-11-03 02:37:58,230 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-03 02:37:58,230 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:37:58,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:37:58,230 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:37:58,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:37:58,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 02:37:58,256 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-03 02:37:58,286 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:58,318 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:58,338 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-03 02:37:58,390 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 02:37:58,390 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 76 [2022-11-03 02:37:58,441 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:58,480 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-03 02:37:58,528 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 02:37:58,529 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-03 02:37:59,764 INFO L180 IcfgInterpreter]: Interpretation finished