Bug 649790 - Invalid cast encountered when trying to get heap info out of firefox
Invalid cast encountered when trying to get heap info out of firefox
Product: Fedora
Classification: Fedora
Component: gdb-heap (Show other bugs)
x86_64 Linux
low Severity medium
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Assigned To: Dave Malcolm
Fedora Extras Quality Assurance
Depends On:
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Reported: 2010-11-04 11:11 EDT by William Cohen
Modified: 2012-08-16 14:02 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2012-08-16 14:02:41 EDT
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Description William Cohen 2010-11-04 11:11:54 EDT
Description of problem:

When trying gdb-heap on firefox, got an invalid cast exception.

Version-Release number of selected component (if applicable):


How reproducible:

Every time

Steps to Reproduce:
1. Start up firefox, note the pid of the/usr/,lib64/firefox-3.6/firefox
2. Start up gdb with and attach to the appropriate process:
    PYTHONPATH=/usr/share/gdb-heap gdb
    python import heap
    attach 2057 # this will need to be pid for /usr/lib64/firefox-3.6/firefox
3. Attempt to print out heap info with:
Actual results:

Traceback (most recent call last):
  File "/usr/share/gdb-heap/heap/commands.py", line 34, in g
    return f(self, args, from_tty)
  File "/usr/share/gdb-heap/heap/commands.py", line 56, in invoke
    usage_list = list(iter_usage_with_progress())
  File "/usr/share/gdb-heap/heap/__init__.py", line 526, in next
    return self.inner.next()
  File "/usr/share/gdb-heap/heap/__init__.py", line 550, in iter_usage
    for chunk in ms.iter_sbrk_chunks():
  File "/usr/share/gdb-heap/heap/glibc.py", line 239, in iter_sbrk_chunks
    if chunk.as_address() > 0:
  File "/usr/share/gdb-heap/heap/__init__.py", line 125, in as_address
    return long(self._gdbval.cast(type_void_ptr))
RuntimeError: Invalid cast.
Error occurred in Python command: Invalid cast.

Expected results:

Information about the various heap allocations that firefox is using.

Additional info:
Comment 1 Dave Malcolm 2010-11-04 19:34:53 EDT
What version of glibc and glibc-debuginfo was this with?
Comment 2 William Cohen 2010-11-05 09:36:24 EDT
Comment 3 Fedora End Of Life 2012-08-16 14:02:43 EDT
This message is a notice that Fedora 14 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 14. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained.  At this time, all open bugs with a Fedora 'version'
of '14' have been closed as WONTFIX.

(Please note: Our normal process is to give advanced warning of this 
occurring, but we forgot to do that. A thousand apologies.)

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