Re: [microblaze-uclinux] microblaze: Use of sigaction() leads to crash on exit

[John Williams <john.williams@xxxxxxxxxxxxx>]

Hi Steve,

On Wed, Nov 11, 2009 at 2:01 AM, Steven J. Magnani
<steve@xxxxxxxxxxxxxxx> wrote:

> I've finished porting my noMMU kernel to 2.6.31 and believe I've adapted
> my uClibc to the ABI changes (typedefs, system call changes,
> SA_RESTORER, etc.) in that release. Most things run fine, which is a
> great improvement over my initial port attempt that crashed and burned.
>
> What I see now (and have ever since 2.6.30) is that quitting the 'top'
> program (the procps one, not the busybox one) crashes the entire system.
> If I comment out the calls to sigaction() in top.c, I can quit the
> program just fine (as long as it's running at the serial console) and
> the system stays up. The system still crashes if I try to quit a 'top'
> running in a telnet session, which I think is a separate issue.
>
> Has anyone else running 2.6.3x encountered similar problems, or can
> confirm this behavior?

I remember when I did some work to bring uClibc up to 0.9.30.1, that
MicroBlaze sighandling had bit-rotted somewhat in the uclibc.org
trees, because they'd changed the internal structure and made fairly
mechanical and incorrect attempts to bring microblaze forward.

I'll dig out some patches that may help.

> I noticed that 2.6.31 made some changes to Microblaze signal handling
> that bring it more in line with the generic kernel code. Were there also
> problems that were being addressed by those changes?

I think more likely is the change to sighandling internals in uClibc.
We didn't have to do anything magical to glibc for example, to get the
new sighandling in place for the MMU variant.

Regards,

John
-- 
John Williams, PhD, B.Eng, B.IT
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com  p: +61-7-30090663  f: +61-7-30090663
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