linux-kernel - Re: [linux-dvb] compiling on 2.6.28 broken?

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Date:	Wed, 14 Jan 2009 16:24:00 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	wk <handygewinnspiel@....de>
Cc:	Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>, rjw@...k.pl,
	HWerner4@....de, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	mchehab@...radead.org
Subject: Re: [linux-dvb] compiling on 2.6.28 broken?

On Wed, 2009-01-14 at 22:19 +0100, wk wrote:
> Chris Mason wrote:
> > On Tue, 2009-01-13 at 13:38 -0700, Matthew Wilcox wrote:
> >   
> >> On Tue, Jan 13, 2009 at 11:37:00AM -0800, Andrew Morton wrote:
> >>     
> >>> I'd have expected to see stat() returning -EOVERFLOW, but it isn't there.
> >>>
> >>> googling around a bit seems to indcate that this might be a glibc issue:
> >>>
> >>> http://sourceware.org/bugzilla/show_bug.cgi?id=1864
> >>> http://bugs.gentoo.org/show_bug.cgi?id=146951
> >>>
> >>> But the traces are all using stat64() and fstat64().  And why would it
> >>> just start occurring now?
> >>>       
> >> Maybe glibc is using the 64-bit stat calls and returning -EOVERFLOW to
> >> the application when the results from the kernel turn out to be > 32-bit
> >> in size?
> >>
> >>     
> >
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6c31b93a14a453c8756ffd228e24910ffdf30c5d
> >
> > I'd guess the commit above is related, although I don't see any way for
> > it to make things interesting without the user doing mount -o inode64.
> >
> > strace -v should show us more, it would show if the inode numbers coming
> > out of stat64 are big.
> >
> > -chris
> >
> >   
> I cannot fully understand what strace -v outputs (see attachment), but 
> what i see is that 'find' stops after finding a file with d_off = 4294967295
> 4294967295  =  0xFFFFFFFF, adding any number greater that zero will be 
> greater that 32bits, so this could be the reason for the message "value 
> too large".
> 
> 
> 
> I also noticed that i cannot access these files through samba if i boot 
> from 2.6.28 - really strange.
> If i reboot older kernels these are visible in samba again and fully 
> accessible.
> 
> Attached the log from stracing the command which was ivoked by the 
> Makefile from v4l-dvb.
> I guess this is all i could contribute to that problem. Thats stuff for 
> xfs filesystem experts now..

Seems suspect indeed.  Could you please attach the strace for the run
that works on the older kernel?

-chris


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