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Date: Thu, 20 Aug 2015 21:30:39 +0300
From: Timo Teras <timo.teras@....fi>
To: Rich Felker <dalias@...c.org>
Cc: Sebastian Gottschall <s.gottschall@...wrt.com>, musl@...ts.openwall.com
Subject: Re: curious file access problem
On Thu, 20 Aug 2015 11:00:20 -0400
Rich Felker <dalias@...c.org> wrote:
> On Thu, Aug 20, 2015 at 04:51:56PM +0200, Sebastian Gottschall wrote:
> > Am 20.08.2015 um 15:48 schrieb Rich Felker:
> > >On Thu, Aug 20, 2015 at 03:25:39PM +0200, Bastian Bittorf wrote:
> > >>* Sebastian Gottschall <s.gottschall@...wrt.com> [20.08.2015
> > >>13:21]:
> > >>>>i cannot see this prob on openwrt.
> > >>>>what is your arch and your exact musl version?
> > >>>same es openwrt. but it seems to be related only to kernel 4.1
> > >>>(or newer) in 3.18 it does not happen in openwrt
> > >>i can see it too - not on 3.18 but with kernel 4.1.5
> > >>you are right, busybox 'route -n' is affected and does not
> > >>see a default route (the same for hexdump, strings...)
> > >In that case, it sounds like somebody broke the kernel. This is
> > >rather unfortunate, and it would be great if someone could look
> > >into the bug and get it fixed before these broken kernels are too
> > >widespread...
> > there are some fib tree enhancements. i nailed it down to a patchset
> > which i can apply and revert to let the problem show up
> > the interesting thing is that uclibc doesnt show that behaviour. but
> > i dont know why. maybe its some sort of application based routing
> > table?
>
> Again, if the bug is in the kernel's tracking of the pseudo-file
> position state (which seems clear now), then whether it manifests or
> not is almost certainly a matter of _how_ the reading takes place
> (small chunks, big chunks, read vs readv vs pread, whether or not
> seeking is involved, etc.). And this is going to vary between
> applications, and if stdio is used by the application to perform the
> reading, then it's also going to vary between stdio implementations
> (and thus libcs).
DaveM's net -stable queue has:
http://patchwork.ozlabs.org/patch/507167/
Sounds like this is the fix for a kernel regression.
/Timo
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