[haiku-bugs] [Haiku] #7740: High resolution JPEG images crash ShowImage due to failure to clone area from app_server
- From: "leavengood" <trac@xxxxxxxxxxxx>
- Date: Fri, 24 Jun 2011 06:41:16 -0000
#7740: High resolution JPEG images crash ShowImage due to failure to clone area
from app_server
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Reporter: leavengood | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Servers/app_server | Version: R1/alpha3
Keywords: | Blocked By:
Blocking: | Has a Patch: 0
Platform: All |
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I have spent hours trying to debug this but I think it is outside my
skillset at this point.
Opening the attached photo (a picture of my yard if you are wondering)
which is more than 8000 pixels wide will always crash ShowImage from
r42239 (and before, I've seen this for a while on big images.)
After much printf debugging I narrowed it down to BBitmap::_InitObject
failing to clone an area from app_server. BBitmapStream::WriteAt just
doesn't check the bitmap InitCheck like it should (that is another bug
which I can fix) and then tries to access the bitmap Bits() which are
null, causing a segfault. My backtrace is also attached, but the line
numbers are probably wrong due to my added printfs. But this should be
reproducable with the attached image.
I used the area command in KDL to look at the area_id being returned from
the app_server, and it seems valid and is owned by the app_server. The
result from clone_area is B_BAD_VALUE, so I assume it is failing at the
lookup_area call on line 1961 of vm.cpp. Maybe for some reason the source
address space returned from the MultiAddressSpaceLocker is wrong?
If I fix BBitmapStream::WriteAt to actually check the InitCheck of the
bitmap it creates, the segfault is fixed, but the image still won't load
of course. It seems to be a deeper problem in either the app_server or
kernel.
I've also included my debug output, and the result of the KDL command area
for the area from the debug output (as well as the teams output to see it
is indeed owned by app_server, team_id 70 = 0x46.)
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Ticket URL: <http://dev.haiku-os.org/ticket/7740>
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