Date: Thu, 20 Aug 2015 23:03:48 +0200 From: Sebastian Gottschall <s.gottschall@...wrt.com> To: Timo Teras <timo.teras@....fi>, Rich Felker <dalias@...c.org> Cc: musl@...ts.openwall.com Subject: Re: curious file access problem Am 20.08.2015 um 20:30 schrieb Timo Teras: > 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 > absolutelly. i will try it and give feedback
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