[Bug general/4060] New: Missing stack frames on i386

[Bug general/4060] New: Missing stack frames on i386

[mcvet at redhat dot com]

Sometimes when stepping into new functions on i386, the frame being stepped /
from/ may dissapear when performing instruction steps.

TestStackBacktrace.testFramePushing and TestStackBacktrace.testFramePopping are 
designed to test this.

These tests do not fail on x86_64 but do appear to fail on x86.

I'll attach a testcase, but the general sitation is that the order of frames 
should be:

main -> foo -> jump

but during the push of 'jump' onto the call stack, the trace may show:

main -> jump

and similarly doing the pop of 'jump' off of the call stack.

-- 
           Summary: Missing stack frames on i386
           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,mcvet at redhat dot com,npremji
                    at redhat dot com
OtherBugsDependingO 1839,3076,3346
             nThis:


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[Bug general/4060] Missing stack frames on i386

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-15 23:47 -------
Created an attachment (id=1555)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1555&action=view)
Test program for this bug.

Perform instruction stepping when about to enter jump() and about to exit
jump() to reproduce the bug.

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[Bug general/4060] Missing stack frames on i386

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-15 23:48 -------
Created an attachment (id=1556)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1556&action=view)
Entering jump()


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[Bug general/4060] Missing stack frames on i386

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-15 23:48 -------
Created an attachment (id=1557)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1557&action=view)
exiting jump()


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[Bug general/4060] Missing stack frames on i386

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-16 16:01 -------
For what its worth, also reproducable in GDB:

(gdb) bt
#0  jump () at stepper.c:55
#1  0x080483db in foo () at stepper.c:76
#2  0x080483f0 in main () at stepper.c:82
(gdb) stepi
0x08048355 in jump () at stepper.c:55
55      }
(gdb) bt
#0  0x08048355 in jump () at stepper.c:55
#1  0x080483f0 in main () at stepper.c:82
(gdb) 


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[Bug general/4060] Missing stack frames on i386

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-16 16:10 -------
Upstream bug:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12990#c3

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |SUSPENDED


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[Bug general/4060] Stack frame epilogues broken

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-02-20 22:33 -------
This bug only concerns the epilogues of the frames - the prologue part is moved 
to #4083

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