plasma-desktop crashes but "strace plasma-desktop" works
1i5t5.duncan at cox.net
Sat Nov 20 02:25:39 GMT 2010
Werner posted on Fri, 19 Nov 2010 12:08:42 +0100 as excerpted:
> What is differend when I start plasma with "stace" ? What can I do to
> find out the problem ?
When you run thru strace, the tracing apparently slows the system down
enough so it works fine, strongly suggesting that the problem is a race
condition or the like, where two programs or threads of the same program
try to access the same resource at the same time. strace forces a
slowdown and AFAIK some serialization of access, such that the problem
disappears when using it.
This sort of disappearing problem is common when trying to debug race
conditions or bad-optimization issues, and can be quite difficult to work
around. On Gentoo, a typical suggestion is to try compiling with standard/
generic optimizations (CFLAGS/CXXFLAGS at the standard "-march=native -O2
-pipe") if the user has tweaked their CFLAGS beyond that, or possibly
something lower still (reducing the -march to -mtune so it's using generic
instruction code, and/or to -O1), basically forcing the system to go
slower by using less optimization, altho the latter is considered a
temporary work-around or debug-only solution, with a bug filing strongly
recommended, since that's definitely pessimistic optimizations compared to
the normal state of affairs, and there's a definite bug to be traced and
fixed if that's required.
And bug filing is exactly what I'd recommend here, as you already seem to
have tried the most obvious stuff, user config (.kde4), and the details of
it working with amd64 but not x86 on the same repo are very intriguing.
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman
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