[Bug general/4856] New: Rich stack traces (fstack -a) throw a NPE exception

[Bug general/4856] New: Rich stack traces (fstack -a) throw a NPE exception

[pmuldoon at redhat dot com]

This is on Fedora 7, with the process bash. Reproducible on a live process and a
core file.

[pmuldoon@localhost frysk-core]$ ps 
  PID TTY          TIME CMD
20214 pts/1    00:00:00 bash

[pmuldoon@localhost frysk-core]$ ./frysk/bindir/fstack -a 20214
Exception in thread "main" java.lang.NullPointerException
   at frysk.stack.StackFactory.printRichStackTrace(StackFactory.java:168)
   at frysk.stack.StackFactory.printTaskStackTrace(StackFactory.java:106)
   at frysk.util.StacktraceAction.printTasks(StacktraceAction.java:151)
   at
frysk.util.StacktraceAction.allExistingTasksCompleted(StacktraceAction.java:196)
   at frysk.proc.ProcBlockAction.checkFinish(ProcBlockAction.java:278)
   at frysk.proc.ProcBlockAction.access$4(ProcBlockAction.java:263)
   at frysk.proc.ProcBlockAction$1.execute(ProcBlockAction.java:98)
   at frysk.event.EventLoop.runEventLoop(EventLoop.java:373)
   at frysk.event.EventLoop.run(EventLoop.java:485)
   at frysk.bindir.fstack.stackPid(fstack.java:151)
   at frysk.bindir.fstack.access$2(fstack.java:146)
   at frysk.bindir.fstack$2.parsePids(fstack.java:169)
   at frysk.util.CommandlineParser.doParse(CommandlineParser.java:153)
   at frysk.util.CommandlineParser.parse(CommandlineParser.java:112)
   at frysk.bindir.fstack.main(fstack.java:239)

-- 
           Summary: Rich stack traces (fstack -a) throw a NPE exception
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: pmuldoon at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4856

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[Bug general/4856] Rich stack traces (fstack -a) throw a NPE exception

[pmuldoon at redhat dot com]

------- Additional Comments From pmuldoon at redhat dot com  2007-07-27 17:32 -------
It fails at frame 2

[pmuldoon@localhost frysk-core]$ ./frysk/bindir/fstack  20214
Task #20214
#0 0x00110402 in __kernel_vsyscall ()
#1 0x43ec2c19 in __waitpid_nocancel ()
#2 0x100f41dd in [unknown]

because the call made to dwfl.getModule() returns null at that address (so
.getName() will cause an NPE)

[pmuldoon@localhost frysk-core]$ ./frysk/bindir/fstack  -a 20214
Subprogram is null. At Adjusted address: 0x110402
Subprogram is null. At Adjusted address: 0x43ec2c18
Subprogram is null. At Adjusted address: 0x100f41dc
dwfl.getModule(0x100f41dc) returns null


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4856

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[Bug general/4856] Rich stack traces (fstack -a) throw a NPE exception

[swagiaal at redhat dot com]

------- Additional Comments From swagiaal at redhat dot com  2007-07-27 19:35 -------
Index: frysk-core/frysk/util/ChangeLog
	+2007-07-27  Sami Wagiaalla  <swagiaal@redhat.com>
	+
	+       * TestFStack.java (multiThreaded): Adjusted regex to account
	+       for the extra lib information.
	+

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=4856

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