New subject: [trinity-devel] Fwd: Re: [arch-general] [trinity-devel] x86_64 kdesktop.kcrash [SOLVED - it is glibc]

25 Feb 2011

Tim, All,

   Below is a backtrace and links to the full backtrace I get in Trinity 
kdesktop. There may be more than 1 bug here, but it looks like at least part of 
it may be in the Trinity code. Let me know if there is something else you think 
may help isolate the issue.

-------- Original Message --------
Subject: Re: [arch-general] [trinity-devel] x86_64 kdesktop.kcrash [SOLVED - it 
is glibc]
Date: Thu, 24 Feb 2011 12:10:41 -0600
From: David C. Rankin &lt;drankinatty(a)suddenlinkmail.com&gt;
Reply-To: General Discussion about Arch Linux &lt;arch-general(a)archlinux.org&gt;
Organization: Rankin Law Firm, PLLC
To: General Discussion about Arch Linux &lt;arch-general(a)archlinux.org&gt;

On 02/23/2011 08:37 PM, David C. Rankin wrote:
...
  On 02/23/2011 07:38 PM, Allan McRae wrote:
  On 24/02/11 10:15, David C. Rankin wrote:
  On 02/23/2011 04:53 PM, David C. Rankin wrote:
  I have no idea what the error means, but it looks
like malloc is complaining
 about corruption?

 #8  0x00007f3550d27b96 in malloc_printerr (action=3, str=0x7f3550dd6a2e
 "malloc(): memory corruption", ptr=<value optimized out>) at
malloc.c:6283
 #9  0x00007f3550d2a4ad in _int_malloc (av=0x7f3551012ea0, bytes=16) at
 malloc.c:4396
 #10 0x00007f3550d2c460 in __libc_malloc (bytes=16) at malloc.c:3660

 I'll also follow up with the Trinity folks because I have just tried downgrading
 to glibc 2.13-3 and I'm still getting the error on x86_64. No issues with i686
 though??

 Hmm.. This is looking like it is a memory corruption in VMs with glibc>  ~ 2.11.
 I'll dump building in Virtualbox and setup a new x86_64 box for the purpose. If
 you have any other thoughts/ideas on the glibc/VM issue, I'd welcome them. 
 Never heard of that.  Do you have a link?  I was thinking that this was a
 treading issue further up the stack... (libxcb??) 
 No link. One of the guys on the Trinity list mentioned the problem, and googling
 turned up a related glibc bug fixed 1/14/2011

 http://www.virtualbox.org/ticket/7981

 I don't know why the internals of a VM would cause the memory corruption entry
 in the backtrace (but then again.. I don't know enough about it to know :)

  What this seems to indicate is that you can no
longer rely on building in a
 clean VirtualBox Arch VM. This problem is more acute for large projects with
 multiple layers of dependencies where an archroot proves difficult for managing
 dependencies for packages later in the build order. 
 I use makechrootpkg -r /root/of/chroot -- -i.   That tells makepkg to install
 after building and the lack of -c means the chroot cleaning does not occur so
 those packages stay installed.

 I had set up an archroot with an internal repository under
 <archroot>/root/chrepo. On i686 it would load the packages as needed. On x86_64
 it wasn't behaving correctly at all. (same pacman.conf, etc..) I had used
 makechrootpkg -r /root/of/chroot -- -i to manually install packages but ran into
 problems so I switched to Virtualbox which was working *perfectly* until I ran
 into this glibc/libxcb issue.

 (Virtualbox still works perfectly for building and running Trinity, it's just
 this issues that has me questioning if vbox is causing problems)

 I'm about to dump kde4 and kdemod3 from an old laptop drive I've got and test
 the issue on a native x86_64 outside of a VM. I'll let you know how it goes.

 If I can get you anything else from the install that has the glibc or libxcb
 issue, let me know and I'm happy to do it.

 BTW: I've tested the kdemod3 update based on Trinity 3.5.12 on both i686 and
 x86_64 and they seem to run fine.

 If this is virtualbox specific, I'd try qemu-kvm.

 Allan

Allan,

   There is something to this glibc/libxcb issue. I have just dumped a prior arch
install on my X86_64 laptop and did a fresh net-install. Nothing but xorg (and
dependencies) on the box. I loaded the latest Trinity binaries - no kdesktop
crash, and it ran fine from startx. But the X resolution was 1024x768 due to
xf86-video-fbdev being the only driver on the box at the time.. After going
through all the kcontrol settings I normally use, I exited the desktop to
install xf86-video-ati.

   On restart of the desktop, the resolution looked great, the desktop looked
great, the kde useful tips window was fine -- then I cliced the 'Close' button
on the useful tips window and my display ripped into little pixels wrapping the
display around itself at least 10 times (the staggered checkerboard pixelation)

   Clicking in the blind, I was able to log off and was greeted by a backtrace on
the console window. I started X again with the output redirected into a file to
catch the error. The basic error is:

<snip>
COP: unregister 'kaccess'
X Error: BadWindow (invalid Window parameter) 3
   Major opcode:  7
   Minor opcode:  0
   Resource id:  0x2000006
X Error: BadWindow (invalid Window parameter) 3
   Major opcode:  6
   Minor opcode:  0
   Resource id:  0x2000006
*** glibc detected *** kdesktop [kdeinit]: double free or corruption (!prev):
0x00000000019b4020 ***
======= Backtrace: =========
/lib/libc.so.6(+0x71b96)[0x7fabc07e2b96]
/lib/libc.so.6(cfree+0x6c)[0x7fabc07e796c]
/opt/trinity/lib/libkdeinit_kdesktop.so(_ZN18KBackgroundManagerD0Ev+0x24)[0x7fabbac2fdfe]
/opt/trinity/lib/libkdeinit_kdesktop.so(_ZN8KDesktopD1Ev+0xe8)[0x7fabbac23ba8]
/opt/trinity/lib/libkdeinit_kdesktop.so(kdemain+0xc27)[0x7fabbac04dff]
/opt/trinity/lib/kde3/kdesktop.so(kdeinitmain+0x20)[0x7fabbae9c77c]
kdesktop [kdeinit][0x408728]
kdesktop [kdeinit][0x409f75]
kdesktop [kdeinit][0x40a866]
kdesktop [kdeinit](main+0xa64)[0x40c1c1]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7fabc078fdcd]
kdesktop [kdeinit][0x4064b9]
======= Memory map: ========
00400000-00411000 r-xp 00000000 08:06 904841
/opt/trinity/bin/kdeinit
00611000-00612000 rw-p 00011000 08:06 904841
/opt/trinity/bin/kdeinit
018a1000-0200f000 rw-p 00000000 00:00 0                                  [heap]
7fabb4000000-7fabb4021000 rw-p 00000000 00:00 0
7fabb4021000-7fabb8000000 ---p 00000000 00:00 0
7fabb9847000-7fabb98b3000 r-xp 00000000 08:06 813482
/usr/lib/libmng.so.1.0.0
7fabb98b3000-7fabb9ab2000 ---p 0006c000 08:06 813482
/usr/lib/libmng.so.1.0.0
<snip>

   The full error is:

http://www.3111skyline.com/dl/dt/trinity/arch/err/X/startx-messages.txt

   The corresponding Xorg.0.log:

http://www.3111skyline.com/dl/dt/trinity/arch/err/X/startx-messages.txt

No (EE).

   I have no idea what this error is. Something is going wrong somewhere on
x86_64 with either glibc or libxcb. I don't know if the output from the startx
command and its backtrace will help narrow this down, but it seems to be a
generic X/glibc/libxcb issue.

   When using the fbdev video driver, there was *no corruption* at all. Then when
I loaded the ati driver all heck broke loose. I don't know what Virtualbox
relies on to create its virtual display driver, but this glibc/libxcb issue is
present on both nvidia and ati based host computers.

   When the current build in the x86_64 laptop is done, I'll load fluxbox and see
what it does on top of the ati driver, but I suspect it will be exactly the
same. I saw this same display pixelation a week ago on a suse 11.3 box after the
xorg files were updated. I had to downgrade the xorg files there to recover. The
pixelation/display wrapping was exactly the same there.

   I'll follow up with the fluxbox results (expect the same), but in the mean
time, if you have any suggestions of what additional information could help, let
me know and I'll go chase it down.

Thanks

-- 
David C. Rankin, J.D., P.E.