On Sun, Feb 26, 2012 at 02:19:59AM +0000, peter green wrote: > Found 651934 3.0.0-2 > Thanks > > Thanks jurij for your help. > >'disassemble' command may be used to look up the assembler code > >around the instruction which caused the crash: > Some further notes on the dissasemble command I ran into while > trying to use it. > > 1: it seems you have to explicitly select a range unless you want a > whole function > 2: if you have debug symbols installed you have to use "info frame" > to get the address of the program counter > 3: the addresses were different on my system, i'm not sure whether > this was because my system was slightly out of date at the time or > because of address randomisation. > >Figuring out why this happens is the tricky part :-). > mmm, the webkit (webkit is the source package for libjavascriptcore) > build log has a huge number of cast alignment warnings :( worse the > file in which the error occoured is generated at webkit build time > and is therefore not available in the webkit source package. I don't > have the resources to build webkit on sparc in a reasonable time. > > Since testing an unstable have different versions of both seed and > webkit. I decided the next thing to try was to build both testing's > version of seed and unstable's versions of seed in both testing and > unstable to try and narrow down which package caused the regression. > However all four combinations failed with a bus error so it seems > this regression happened before the version of webkit that is now in > testing. > > I'm now marking this bug as affecting the version in testing as well. > > Webkit maintainers: Is any form of testsuite for libjavascriptcore > run at webkit build time? I didn't spot anything on a quick look at > the log but the log is massive so it's possible I missed it.
I poked around the webkit source a bit and found that there is a WTF_CPU_NEEDS_ALIGNED_ACCESS macro, which is conditionally set to 1 only for ARM, MIPS and SH4 CPUs. I'm currently trying to build webkit with attached patch to see whether this improves things. Best regards, -- Jurij Smakov ju...@wooyd.org Key: http://www.wooyd.org/pgpkey/ KeyID: C99E03CC
diff -aur a/Source/JavaScriptCore/wtf/Platform.h b/Source/JavaScriptCore/wtf/Platform.h --- a/Source/JavaScriptCore/wtf/Platform.h 2012-02-25 11:10:13.000000000 +0000 +++ b/Source/JavaScriptCore/wtf/Platform.h 2012-02-25 11:26:17.992010602 +0000 @@ -295,7 +295,7 @@ #endif /* ARM */ -#if CPU(ARM) || CPU(MIPS) || CPU(SH4) +#if CPU(ARM) || CPU(MIPS) || CPU(SH4) || CPU(SPARC) #define WTF_CPU_NEEDS_ALIGNED_ACCESS 1 #endif
