[gentoo-embedded] Enabling core-dumps

[gentoo-embedded] Enabling core-dumps

[Joshua ChaitinPollak]

Hello,

I'm trying to figure out how to enable core dumps on my Gentoo  
embedded environment. Is there a busybox or uclibc switch I need to  
enable to get it to work?

I've tried:

echo "/tmp/%p.core" > /proc/sys/kernel/core_pattern
ulimit -c unlimited
./crash

Which on my desktop gets me a core file:

$ ./crash
Segmentation fault (core dumped)

But nothing happens on my embedded environment:

# ./crash
Segmentation fault

Any ideas? Thanks,

Josh

-- 
Joshua ChaitinPollak
Software Engineer
Kiva Systems


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Re: [gentoo-embedded] Enabling core-dumps

[Mike Frysinger]

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On Monday 01 October 2007, Joshua ChaitinPollak wrote:
> I'm trying to figure out how to enable core dumps on my Gentoo
> embedded environment. Is there a busybox or uclibc switch I need to
> enable to get it to work?

the way it should work is your shell communicates the ulimit to the kernel and 
then the kernel will generate the .core upon a crash ... so either your 
kernel is broken or the ulimit->busybox->uclibc->kernel chain is broken

you can check the latter pretty easily by doing something like:
$ strace -f -o out sh
$ ulimit -c unlimited
$ exit
then in the "out" file, you should see proper calls to getrlimit()/setrlimit() 
for RLIMIT_CORE ...

as for the former, keep in mind it is possible to entirely disable ELF core 
support in the kernel ... verify CONFIG_ELF_CORE is enabled
-mike

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Re: [gentoo-embedded] Enabling core-dumps

[Joshua ChaitinPollak]

On Oct 1, 2007, at 8:41 PM, Mike Frysinger wrote:

>
> as for the former, keep in mind it is possible to entirely disable  
> ELF core
> support in the kernel ... verify CONFIG_ELF_CORE is enabled
> -mike

Yup, that was the problem, thanks.

-- 
Joshua ChaitinPollak
Software Engineer
Kiva Systems


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