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Bug 986713 - FTBFS test_gdb.py fails on arm
Summary: FTBFS test_gdb.py fails on arm
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Fedora
Classification: Fedora
Component: python3
Version: 20
Hardware: arm
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Bohuslav "Slavek" Kabrda
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: ARMTracker
TreeView+ depends on / blocked
 
Reported: 2013-07-21 20:23 UTC by Dennis Gilmore
Modified: 2019-10-28 13:57 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-09-23 17:39:12 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)

Description Dennis Gilmore 2013-07-21 20:23:30 UTC 
Description of problem:

Verify that the "py-up" command works ... skipped 'Python was compiled with optimizations'
Verify that "py-bt" indicates threads that are waiting for the GIL ... FAIL
test_basic_command (__main__.PyPrintTests)
Verify that the "py-print" command works ... skipped 'Python was compiled with optimizations'
test_print_after_up (__main__.PyPrintTests) ... skipped 'Python was compiled with optimizations'
test_printing_builtin (__main__.PyPrintTests) ... skipped 'Python was compiled with optimizations'
test_printing_global (__main__.PyPrintTests) ... skipped 'Python was compiled with optimizations'
test_basic_command (__main__.PyLocalsTests) ... skipped 'Python was compiled with optimizations'
test_locals_after_up (__main__.PyLocalsTests) ... skipped 'Python was compiled with optimizations'

======================================================================
FAIL: test_threads (__main__.PyBtTests)
Verify that "py-bt" indicates threads that are waiting for the GIL
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./Lib/test/test_gdb.py", line 758, in test_threads
    cmds_after_breakpoint=['thread apply all py-bt'])
  File "./Lib/test/test_gdb.py", line 212, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ['Cannot access memory at addr... != []

First list contains 4 additional elements.
First extra element 0:
Cannot access memory at address 0x0

+ []
- ['Cannot access memory at address 0x0',
-  'Cannot access memory at address 0x0',
-  "Python Exception <class 'gdb.error'> Frame is invalid.: ",
-  'Error occurred in Python command: Frame is invalid.']

----------------------------------------------------------------------
Ran 45 tests in 105.321s

FAILED (failures=1, skipped=15)
Traceback (most recent call last):
  File "./Lib/test/test_gdb.py", line 887, in <module>
    test_main()
  File "./Lib/test/test_gdb.py", line 883, in test_main
    PyLocalsTests
  File "/builddir/build/BUILD/Python-3.3.2/Lib/test/support.py", line 1592, in run_unittest
    _run_suite(suite)
  File "/builddir/build/BUILD/Python-3.3.2/Lib/test/support.py", line 1567, in _run_suite
    raise TestFailed(err)
test.support.TestFailed: Traceback (most recent call last):
  File "./Lib/test/test_gdb.py", line 758, in test_threads
    cmds_after_breakpoint=['thread apply all py-bt'])
  File "./Lib/test/test_gdb.py", line 212, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ['Cannot access memory at addr... != []

First list contains 4 additional elements.
First extra element 0:
Cannot access memory at address 0x0

+ []
- ['Cannot access memory at address 0x0',
-  'Cannot access memory at address 0x0',
-  "Python Exception <class 'gdb.error'> Frame is invalid.: ",
-  'Error occurred in Python command: Frame is invalid.']

[103998 refs]


Version-Release number of selected component (if applicable):
python3-3.3.2-3.fc20
Comment 1 Brendan Conoboy 2013-07-22 18:45:55 UTC 
Is this the same as https://bugzilla.redhat.com/show_bug.cgi?id=951802 ?
Comment 2 Bohuslav "Slavek" Kabrda 2013-07-24 07:16:09 UTC 
(In reply to Brendan Conoboy from comment #1)
> Is this the same as https://bugzilla.redhat.com/show_bug.cgi?id=951802 ?

Nah, this looks completely different. @CC Dave, do you have any idea what might cause this?
(note: there is a distinct possibility that my downstream patch [1] might influence this, but IMO it is not the case)

[1] http://pkgs.fedoraproject.org/cgit/python3.git/commit/?h=f19&id=b935d25938262c5161ab89752972f642f7dea5b6
Comment 3 Dennis Gilmore 2013-07-26 17:19:55 UTC 
as a temporary workaround im disabling the test so we can move forward. we do need to get it fixed.
Comment 4 Fedora End Of Life 2013-09-16 14:41:45 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle.
Changing version to '20'.

More information and reason for this action is here:
https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora20
Comment 5 Dave Malcolm 2019-10-28 13:57:06 UTC 
(In reply to Bohuslav "Slavek" Kabrda from comment #2)
> (In reply to Brendan Conoboy from comment #1)
> > Is this the same as https://bugzilla.redhat.com/show_bug.cgi?id=951802 ?
> 
> Nah, this looks completely different. @CC Dave, do you have any idea what
> might cause this?
> (note: there is a distinct possibility that my downstream patch [1] might
> influence this, but IMO it is not the case)
> 
> [1]
> http://pkgs.fedoraproject.org/cgit/python3.git/commit/
> ?h=f19&id=b935d25938262c5161ab89752972f642f7dea5b6

[Clearing out the needinfo request]

Sadly, there are many ways in which the gdb script can fail: it's affected by the version of gcc and the optimization flags used, and the version of gdb.

FWIW, it looks like the gdb hooks were trying to dereference a null pointer in the inferior process.
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