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Bug 371525 (unaligned-access) - [TRACKER] packages with unaligned accesses
Summary: [TRACKER] packages with unaligned accesses
Status: CONFIRMED
Alias: unaligned-access
Product: Quality Assurance
Classification: Unclassified
Component: Trackers (show other bugs)
Hardware: All Linux
: Normal normal
Assignee: Gentoo Quality Assurance Team
URL:
Whiteboard:
Keywords: Tracker
Depends on: 634822 636552 638066 640618 642284 717908 920066 920345 920956 923423 924180 924191 925109 13402 42010 87218 99290 118777 152487 154928 157408 158550 163430 179877 192491 195717 201102 209501 209550 218278 227391 230953 239472 246483 250830 250880 251603 260481 265792 270867 278377 292940 295682 304921 310095 320871 348387 363705 371527 371561 380559 401615 454006 454470 488226 498514 498632 532088 558436 565630 591312 638172 638888 642360 642492 642756 643086 647238 659460 663976 664860 666448 673472 676062 683018 686620 686914 700190 700902 709014 793398 797358 805974 818400 829270 830275 847853 867931 905750
Blocks:
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Reported: 2011-06-13 22:01 UTC by Matt Turner
Modified: 2024-02-20 22:07 UTC (History)
13 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Matt Turner gentoo-dev 2011-06-13 22:01:39 UTC
Unaligned accesses (see: [1]) are bad.

To find the source of unaligned accesses, use sys-apps/prctl and the instructions here [2].

[1] http://en.wikipedia.org/wiki/Segmentation_fault#Bus_error
[2] http://www.gelato.unsw.edu.au/IA64wiki/UnalignedAccesses

No comments here. This is simply a tracker bug.
Comment 1 SpanKY gentoo-dev 2011-07-12 18:46:25 UTC
the kernel on these arches should automatically fixup unaligned access so the code at least works (albeit at a performance penalty).  if they dont, i'd say that's a bad kernel config.

(i dont mind fixing up unaligned programs, but it shouldnt take priority over "real" bugs imo)
Comment 2 Matt Turner gentoo-dev 2011-07-12 19:41:54 UTC
By default (is there some way to change this?) on MIPS and SPARC, unaligned accesses cause SIGBUS. I know other architectures trap unaligned accesses and handle them in the kernel.
Comment 3 Larry the Git Cow gentoo-dev 2022-02-21 05:15:44 UTC
The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/proj/devmanual.git/commit/?id=f0be5cfbd0fe4f62fe0ee70abef4044247984a7b

commit f0be5cfbd0fe4f62fe0ee70abef4044247984a7b
Author:     Sam James <sam@gentoo.org>
AuthorDate: 2022-01-22 20:48:47 +0000
Commit:     Sam James <sam@gentoo.org>
CommitDate: 2022-02-21 05:15:25 +0000

    archs/sparc: mention SIGBUS/unaligned access and link to tracker bug
    
    Bug: https://bugs.gentoo.org/371525
    Signed-off-by: Sam James <sam@gentoo.org>
    Closes: https://github.com/gentoo/devmanual/pull/266
    Signed-off-by: Sam James <sam@gentoo.org>

 archs/sparc/text.xml | 14 ++++++++++++++
 1 file changed, 14 insertions(+)