specific .blend with hair crashes in MacOS 2.78 RC1 on render #49290
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Reference: blender/blender#49290
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System Information
MacOS El Capitain Intel CPU, nvidia GPU (using CPU rendering)
Blender Version
Broken: 2.78 RC1
Worked: not sure as the file is new
Short description of error
The specific file causes a crash after hitting render
Exact steps for others to reproduce the error
download this .blend{F355677}
open in it on a mac running el capitaine
press render
it crashes here on multiple machine, just after the importance sampling message flashes on screen
Changed status to: 'Open'
Added subscriber: @BassamKurdali
seems like all tube/wires for empathy files are crashing now. Our lab just upgraded macos, somehow this didn't happen on the old version :/
Added subscriber: @mont29
Didn’t went through whole render (takes ages here, even at 10% resolution), but did see some purple hands in tiles, so I guess I cannot reproduce the issue on linux with latest master, not even with asan-enabled debug build…
Added subscriber: @Sergey
Can't reproduce the crash here. but some notes:
Ok, with help of @mont29 i've learned how to read. It is CPU rendering :)
Sorry for the spam :)
Please also test latest builds from builder.blender.org. There were some crash fixes here and there since RC1.
Hey guys, some extra info:
Added subscriber: @brecht
I can't reproduce the crash with Bender 2.78 RC1 on OS X 10.11.6. Is there a backtrace?
I'll get one tomorrow when I'm at the uni. as far as I remember it's really short, just a few lines.
(this is from the crash.txt)
Hey folks, so:
OS is 10.11.6 also
2.77a does not crash
I copied the report and pasted it here http:*pasteall.org/79074
I've narrowed it down to one asset, our main character. I'm going to see if I can get it down smaller:
gilgamesh.blend
gilgameshdelete_A.blend
Hey folks!
So I narrowed it down to the simplest element.
You'll see there is a single particle system on the single mesh in the file, called 'lashes'
The file crashes on render unless the particle system is deleted, again. only on macos. it is 100% reliable crash here.
Since Brecht couldn't replicate (are you using the release candidate or your own build) I would like to try bisecting till I find the commit. (2.77a works)
Are the buildbot builds saved somewhere or is only the most recent one available? I haven't built blender on macos so far.
I can reproduce the crash with this latest file, if I disable AVX and AVX2 in the debug panel. Seems to be something in the hair QBVH, don't understand what's happening exactly yet.
thanks brecht! trying to use git bisect to pinpoint the commit where it breaks, not sure I'm doing it right ;)
Output of git bisect:
specific .blend crashes in MacOS 2.78 RC1 on renderto specific .blend with hair crashes in MacOS 2.78 RC1 on renderIt doesn't crash in debug mode so it's a bit difficult to investigate. Here is the backtrace using RelWithDebInfo. I'd expect it to trigger an assert if we are reading outside of the array bounds but that doesn't happen.
@brecht, asserts will not have an affect in RelWithDebInfo builds, so you'll have to replace
#define kernel_assert()
with something like:#define kernel_assert(statement) \
I can't reproduce the error with neither of the CPU flags on my desktop and laptop. Will try to occupy our buildbot iMac and see if i can reproduce the issue.
So far my bet is on the difference in child intersection mask for degenerate boundbox or for some NaN/inf ray origin/direction (similar issues happened in the past with original QBVH travsersal). This could overflow traversal stack.
Ok, managed to reproduce on iMac. And indeed it's an overflwo of traversal stack. Digging deeper.
This issue was referenced by blender/cycles@aa2267604f
This issue was referenced by
52038fd8c7
Changed status from 'Open' to: 'Resolved'
Thanks for fixing what seems to have been a tricky bug (and fixing our farm!)