[Bug general/4431] New: AckDaemonProcess doesn't appear to fully wait

["mcvet at redhat dot com" <sourceware-bugzilla@sourceware.org>]

In most of the RT testcases, AckDaemonProcesses are used to start up a test 
process. However, often, (usually second iteration of the test), the test will 
fail becase the grabbed stack trace is not a proper stack trace of the process, 
and as noticed in #4394:

"I grabbed some stack traces of the traced process, and ended up with varying 
results, including the following:

#0 0x00002aaaaaab1a2b in _dl_map_object_from_fd ()
#1 0x00002aaaaaab2d9c in _dl_map_object ()
#2 0x00002aaaaaab610d in openaux ()
#3 0x00002aaaaaab7d26 in _dl_catch_error ()
#4 0x00002aaaaaab67d6 in _dl_map_object_deps ()
#5 0x00002aaaaaaae306 in dl_main ()
#6 0x00002aaaaaabde0b in _dl_sysdep_start ()
#7 0x00002aaaaaaac468 in _dl_start ()
#8 0x00002aaaaaaabb58 in [unknown]

or

#0 0x00002aaaaaabeff6 in strcmp ()
#1 0x00002aaaaaab3c87 in check_match.8134 ()
#2 0x00002aaaaaab4084 in do_lookup_x ()
#3 0x00002aaaaaab4282 in _dl_lookup_symbol_x ()
#4 0x00002aaaaaab57a5 in _dl_relocate_object ()
#5 0x00002aaaaaaae77a in dl_main ()
#6 0x00002aaaaaabde0b in _dl_sysdep_start ()
#7 0x00002aaaaaaac468 in _dl_start ()
#8 0x00002aaaaaaabb58 in [unknown]

or 

#0 0x00002aaaaaab7bc3 in _dl_fixup ()
#1 0x00002aaaaaabd3a2 in _dl_runtime_resolve ()
#2 0x00002aaaaaccb628 in __pthread_initialize_minimal ()
#3 0x00002aaaaaccaf29 in _init ()

or just plain:

#0 0x00002aaaaaabeff4 in [unknown]"

The relevant code is usually something like:

    AckDaemonProcess process = new AckDaemonProcess
	(Sig.POLL, new String[] {
	    getExecPath ("funit-rt-threader"),
	    "" + Pid.get (),
	    "" + Sig.POLL_
	});
        
    myTask = process.findTaskUsingRefresh(true);
    SteppingEngine.setProc(myTask.getProc());

However, the problem is mitigated by placing 

    try { Thread.sleep(500); } catch (Exception e) {}

between the initialization of the AckDaemonProcess, and the call to 
SteppingEngine. It appears as though the process needs time to fully load and 
start running before the test begins.

-- 
           Summary: AckDaemonProcess doesn't appear to fully wait
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: mcvet at redhat dot com
                CC: cagney at redhat dot com,mark at klomp dot org
OtherBugsDependingO 2935,3346
             nThis:


http://sourceware.org/bugzilla/show_bug.cgi?id=4431

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