[uClinux-dev] rrdtool: crashing when rendering graphics (m68k target)

[Luis Alves]

Hi,

I've tried the 'rrdtool' included in the latest uClinux dist (20120401).
Creating the database, inserting and fetching values work fine, but
when I try to create a .png chart it do one of these two things:
1) Crash the kernel (I'm almost sure it writes in bad memory locations)
2) Give an 'Address Error' trap.

Before I start to dig the code to find the issue (if I ever get time
to do it), has anyone used this tool in a m68k target? If yes, does it
work good?
What about in other nommu targets?

Thanks,
Luis

[Greg Ungerer]

Hi Luis,

Post by Luis Alves
I've tried the 'rrdtool' included in the latest uClinux dist (20120401).
Creating the database, inserting and fetching values work fine, but
1) Crash the kernel (I'm almost sure it writes in bad memory locations)
2) Give an 'Address Error' trap.
Before I start to dig the code to find the issue (if I ever get time
to do it), has anyone used this tool in a m68k target? If yes, does it
work good?
What about in other nommu targets?

I haven't used rrdtool on uClinux, so I can't verify that it works.

But when you see these sorts of odd crashes the first thing I try
is to increase the stack size of the app. Its all too easy to overrun
your app stack.

If you grep for FLTFLAGS in user/*/Makefile you will see how to
set a larger stack size.

Regards
Greg

------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: gerg at snapgear.com
SnapGear Group, McAfee PHONE: [phone]
8 Gardner Close, FAX: [phone]
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com

[Luis Alves]

Thanks a lot Greg! Increased the stack size and it works now!
By default it is set to the 4k default.

Always learning!

Thanks and Regards,
Luis Alves

No dia 4 de Mai de 2012 14:41, "Greg Ungerer" <gerg at snapgear.co

Post by Greg Ungerer
Hi Luis,

Post by Luis Alves
I've tried the 'rrdtool' included in the latest uClinux dist (20120401).
Creating the database, inserting and fetching values work fine, but
1) Crash the kernel (I'm almost sure it writes in bad memory locations)
2) Give an 'Address Error' trap.
Before I start to dig the code to find the issue (if I ever get time
to do it), has anyone used this tool in a m68k target? If yes, does it
work good?
What about in other nommu targets?

I haven't used rrdtool on uClinux, so I can't verify that it works.
But when you see these sorts of odd crashes the first thing I try
is to increase the stack size of the app. Its all too easy to overrun
your app stack.
If you grep for FLTFLAGS in user/*/Makefile you will see how to
set a larger stack size.
Regards
Greg
------------------------------**------------------------------**
------------
Greg Ungerer -- Principal Engineer EMAIL: gerg at snapgear.com
SnapGear Group, McAfee PHONE: [phone]
8 Gardner Close, FAX: [phone]
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com

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