Re: [bisected] 2.6.29-rc1 Firefox crashing on page load

[Justin Madru]

Hiroshi Shimamoto wrote:
> Justin Madru wrote:
>   
> > Hiroshi Shimamoto wrote:
> >     
> > > Justin Madru wrote:
> > >   
> > >       
> > > > Hiroshi Shimamoto wrote:
> > > >     
> > > >         
> > > > > Justin Madru wrote:
> > > > >       
> > > > >           
> > > > > > Ok, finally bisected the bug, but the commit isn't related to networking!
> > > > > > I did: git revert 4217458dafaa57d8e26a46f5d05ab8c53cf64191
> > > > > > on current git and that fixed the bug.
> > > > > >
> > > > > > By the way, how do I undo my git revert, so I'm back to a pristine tree?
> > > > > > I want to drop my changes - the revert.
> > > > > > Also how do I find the commit that merged/pulled in this commit?
> > > > > >
> > > > > > commit 4217458dafaa57d8e26a46f5d05ab8c53cf64191
> > > > > > Author: Hiroshi Shimamoto <h-shimamoto@xxxxxxxxxxxxx>
> > > > > > Date: Fri Dec 5 17:17:09 2008 -0800
> > > > > >
> > > > > > x86: signal: change type of paramter for sys_rt_sigreturn()
> > > > > >
> > > > > > Impact: cleanup on 32-bit
> > > > > >
> > > > > > Peter pointed this parameter can be changed.
> > > > > >
> > > > > > Signed-off-by: Hiroshi Shimamoto <h-shimamoto@xxxxxxxxxxxxx>
> > > > > > Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
> > > > > >         
> > > > > >             
> > > > > Hi,
> > > > > thanks for reporting.
> > > > >
> > > > > I'm not sure why this commit affects.
> > > > > Can you check vmlinux? size, objdump, etc.
> > > > > On my environment, the generated code looks same.
> > > > >
> > > > > Thanks,
> > > > > Hiroshi
> > > > >
> > > > >       
> > > > >           
> > > > I tried to do an objdump but it gave an error. How am I suppose to do an 
> > > > objdump?
> > > >
> > > > $ objdump -x /boot/vmlinuz-2.6.29-rc2-git
> > > > objdump: /boot/vmlinuz-2.6.29-rc2-git: File format not recognized
> > > > $ readelf -a /boot/vmlinuz-2.6.29-rc2-git
> > > > readelf: Error: Unable to seek to 0xc031f2eb for section headers
> > > > readelf: Error: Not an ELF file - it has the wrong magic bytes at the start
> > > > $ ls -la /boot/vmlinuz-2.6.29-rc2-git
> > > > -rw-r--r-- 1 root root 2286480 2009-01-19 18:44 /boot/vmlinuz-2.6.29-rc2-git
> > > >     
> > > >         
> > > not vmlinuz, vmlinux.
> > > vmlinuz is a compressed kernel, it is not ELF file.
> > > Usually vmlinux is generated in top of source directory.
> > > I can see disassembled image with objdump -d vmlinux.
> > >
> > > Thanks,
> > > Hiroshi
> > >
> > >   
> > >       
> > Sorry, didn't know. I tried objdump -d vmlinux, but the resulting file 
> > is ~50MB!
> > Is there a smaller section you're interested in, because that would be 
> > hard to send.
> > Or am I doing it wrong again?
> >     
>
> that's OK. No need to send the disassembled result.
> You can diff disassembled file.
> I guess your GCC generates different code when the patch is reverted.
>
> Thanks,
> Hiroshi
>
>   
Ok, I tried, I really did. But no mater what I did the diff was even bigger
if not the same size as the original dump! I even tried to cut out the 
first two fields with
   cut -f3- dump-revert > dump-revert2
but that wouldn't shrink the diff size (100,000+ lines).

Does gcc output fluctuate this wildly with such little change?
Is there a config option that allows gcc to randomize the output?
I recompiled just to make sure, and even two recompiles of the same 
source (no revert)
resulted in a different sha1 hash (didn't test the objdump diff).
The only thing I can think of is that I compile with -O3 instead of -O2.

I'm sorry, but unless you have any suggestions I've decided to just upload
the vmlinux files to my server (<40KB up speed) 
http://jdserver.homelinux.org/bugreports/002/
and rapidshare
http://rapidshare.com/files/186890846/vmlinux.tar.bz2.html
http://rapidshare.com/files/186890848/data-norevert.tar.bz2.html
http://rapidshare.com/files/186890849/data-revert.tar.bz2.html

By the way Ingo has already added the revert to tip/master
http://git.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=commit;h=1d03950243904c89b8854c10516932b029c2a8fa

Justin Madru
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