[Buildroot] segfault in uClibc- when using busybox ip

Arnout Vandecappelle arnout at mind.be
Wed Feb 27 21:47:24 UTC 2013

On 27/02/13 17:46, mathematician1975 wrote:
> I have used buildroot to generate my crosstools, root file system, kernel
> (3.6.11) and busybox (1.21.0) for an i386 (Geode) target board. Basically I
> am using buildroot to generate everything. I was recently trying to
> configure my network but when I invoked the following from the command line
> # ip addr show dev eth0
> I received the following report of a segfault.
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen
>      1000 link/ether 00:18:7d:19:a0:d8 brd ff:ff:ff:ff:ff:ff
>      inet brd scope global eth0
> [  331.700545] ip[951]: segfault at 0 ip b76e1f26 sp bfbd29b0 error 4 in
> libuClibc-[b76b5000+4d000]
> Segmentation fault
> I have searched these archives for similar reports but I cannot find
> anything. I would be very grateful for any advice that anyone who has had a
> similar problem can offer, or how I go about trying to establish if this is
> down to user error on my part or a bug in busybox/uClibc.

  User error is unlikely, unless you did something very strange while 
building. Given that the segfault happens in uClibc, it's most likely a 
uClibc problem. Definitely not a buildroot problem :-)

  Here are some hints how to debug:

- Rebuild with another uClibc version.

- Do an 'objdump -d output/staging/lib/libc.so | less' and look what is 
at address b76e1f26.

- Run it in a chroot or emulated environment. If that works, then it's 
most likely a problem with mismatch of your build options and the Geode 
processor (so user error after all :-).

- Run the 'ip' program in a debugger (gdbserver) to find what goes wrong.

- Check uClibc mailing lists for similar issues.

  Good luck!


Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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