[Xquartz-dev] Re: Xquartz-1.3.0-apple3
bbyer at apple.com
Fri Dec 7 16:08:37 PST 2007
"Cool" -- this still reproduces for me even with alloca disabled.
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00062a24
[Switching to process 79040 thread 0x3203]
0x00098715 in fbBltOne (src=0x16a55740, srcStride=<value temporarily
unavailable, due to optimizations>, srcX=7, dst=0x62a24,
dstStride=<value temporarily unavailable, due to optimizations>,
dstX=16672, dstBpp=32, width=32, height=1, fgand=4278190080, fgxor=0,
bgand=4278190080, bgxor=16776960) at fbbltone.c:371
371 *dst = FbStippleRRop (*dst, mask,
(gdb) print src
$1 = (FbStip *) 0x16a55740
(gdb) print *src
$2 = 60
(gdb) print dst
$3 = (FbBits *) 0x62a24
So, fbBltOne is trying to write out too many bits. I ran into this
bug a lot in the Tiger version, and did a lot of digging to isolate
the cause -- only to discover that it was a known issue. They never
found the problem, but somewhere around 1.2 they put the following
186 * Do not read past the end of the buffer!
188 srcEnd = src + height * srcStride;
... hm ... maybe we need something similar for dst?
On Dec 7, 2007, at 2:25 PM, Jeremy Huddleston wrote:
> I'll put out a version with alloca disabled for you to test in a bit.
> On Dec 7, 2007, at 14:11, Simone Karin Lehmann wrote:
>> Am 06.12.2007 um 05:15 schrieb Jeremy Huddleston:
>>> I've just pushed Xquartz-1.3.0-apple3 to the server and source
>>> code is uploading now. wiki will be updated soon.
>>> Pretty much the only change users will notice over 1.3.0-apple2
>>> (from X11-220.127.116.11.pkg) is a hook to disable fbBlah calls. If you
>>> have been experiencing crashes in fbFill or other calls that start
>>> with fb, then try this out and let us know how it works for you:
>>> Start Terminal.app and execute:
>>> $ touch /tmp/disable_fb.txt
>>> Now launch X and try to crash it.
>> This doesn't work for me.
>> I've tried it and I can still get X to crash in fbBlah routines.
>> I'm using Gimp. You can download it from http://gimp.lisanet.de/Website/Gimp_unter_Mac_OS_X_files/Gimp%202.4.2%20Leopard.dmg
>> Now open an image with big dimensions. Mine is a 3474x2314 tiff
>> Duplicate the background layer twice by clicking on the duplicate
>> layer icon in gimp's toolbox window.
>> Now click on the menu text in the image window _without_ first
>> clicking on the image window's title bar.
>> Works every time :-(
>> FYI: I use the click_trough feature of quartz_wm.
>> in the arms of your angel, you may find some comfort here.
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