Re: [uml-devel] SIGSEGV and SA_NODEFER

[Rob Landley <rob@landley.net>]

On Friday 21 January 2005 02:58 pm, Blaisorblade wrote:

> That is -mm1, I've already looked at both... the patches listed below are
> minor fixes / improvements...
>
> The name of the 2.6.11-rc1-mm2 patch which probably fixed your issue is:
>
> uml-fix-a-stack-corruption-crash.patch

I reverted that patch, rebuilt vmlinux, tried again, and it's happily halfway 
through the binutils build as I type.  That fix doesn't seem to be it.  
(Makes a certain amount of sense, since I wasn't seeing a crash, I was seeing 
a hang.)

> If it's not a problem, try removing it from -mm2 and recompiling, and test
> if you get the crash with the new kernel (which is what I expect)...
>
> > More later, lunch is over...
>
> Here, now, I must go to dinner... bye!

Another interesting point is that with -mm2 (patched or unpatched), I'm seeing 
output hiccups when the system swaps.  Here's a cut and paste of a section 
where it was extracting the binutils tarball:

binutils-2.14/gas/testsuite/gas/hppa/unsorted/common.s
binutils-2.14/gas/testsuite/gas/hppa/unsorted/fragbug.s
binutils-2.14/gas/testsuite/gas/hppa/unsorteortedrted/ted/ged/gld/glo/globglobalobalobalbbalbualbuglbug.bug.sug.sg.s.ss
binutils-2.14/gas/testsuite/gas/hppa/unsorted/importbug.s

And later on...

binutils-2.14/ld/testsuite/ld-sparc/tlssunbin64.dd
binutils-2.14/ld/testsuite/ld-sparc/tlssunbin64.rd
binutils-2.14/ld/testsuite/lde/ld-/ld-sld-spd-spa-sparsparcparc/arc/trc/tlc/tls/tlsstlssulssunssunbsunbiunbinnbin6bin64in64.n64.s64.s4.s.ss
binubinutinutinutilutilstils-ils-2ls-2.s-2.1-2.142.14/.14/l14/ld4/ld//ld/tld/ted/tes/testtestsestsustsuitsuitsuiteuite/ite/lte/lde/ld-/ld-sld-spd-spa-sparsparcparc/arc/trc/tlc/tls/tlsstlssulssunssunbsunbiunbinnbin6bin64in64.n64.s64.sd4.sd.sdsd
binutils-2.14/ld/testsuite/ld-sparc/tlssunbin64.td
binutils-2.14/ld/testsuite/ld-sparc/tlssunbinpic32.s
binutils-2.14/ld/testsuite/ld-sparc/tlssunbinpic64.s
binutils-2.14/ld/testsuite/ld-sparc/tlssunnopic32.dd

It did it about five or six times, that I noticed.  (And it did it before I 
reverted the stack fix patch, so that's not it.)

I had all that output piped to tee, which output it to out.txt, and the 
corresponding line of out.txt isn't glitched, so it seems to just be a 
cosmetic bug in the display code.  But I thought I'd report it anyway.  I'm 
using stdin/stdout as the console.  (And even though you put it into raw 
mode, I still can't ctrl-c out of the processs I'm running, either.)

Rob


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