[fedora-arm] Possible glibc bug manifesting only on SMP ARMv7 systems

[Peter Robinson]

On Tue, Nov 29, 2011 at 1:30 PM, Gordan Bobic <gordan at bobich.net> wrote:
> Guys,
>
> After chasing my tail for ages thinking I had a hardware issue on an
> AC100, it looks like the random segfaults and "glibc detected a
> corrupted doubly linked list" errors might actually be SMP and/or ARMv7
> related.
>
> Errors:
> - random segfaults
> - glibc detected a corrupted doubly linked list
>
> Distro: Fedora 13
>
> Platforms that work flawlessly (24/7 compiling for weeks):
> - Marvell Kirkwood (1x SheevaPlug, 1x DreamPlug).
>
> Platforms that cause repeatable segfaults (same rootfs, same operation):
> - Tegra2 (tested using Toshiba AC100 and Compulab TrimSlice)
> - OMAP 4xxx (tested on a PandaBoard)
>
> I'm going to dig into this deeper (boot the machine with nosmp or
> tasksetting everything to run on the same core), but in the meantime I
> would like to ask if there is a bug in any of the following:
>
> - glibc
> - gcc
> - binutils
>
> that might cause them to misbehave either on:
> - ARMv7 (armv5tel packages on armv7l kernel)
> or
> - SMP ARM systems
> (or both)
>
> I'm going to compile up a clean kernel (without all the hacks I tried on
> the AC100 to try to troubleshoot the issue) and try building the
> packages in a clean F13 mock just to do a definitive confirmation pass,
> but if anyone is aware of any such issues (e.g. due to locking
> primitives being different on ARMv7) that have been fixed in
> glibc/gcc/binutils recently, I would appreciate any info you may have on
> the subject.
>
> Ubuntu doesn't appear to suffer from this issue, but they use a much
> newer gcc and a different glibc than what is in F13.

Have you tried a F-14 rootfs?

Peter