Re: [Discuss-gnuradio] Rational Resampler throws double free or corruption error

[Marcus Müller]

Hi Frederik, hi rest,

this is an interesting error. You might want to report it.
The interesting part of your backtrace is
#8  ~vector (this=0xbee7c59c, __in_chrg=<optimized out>)
    at /usr/include/c++/4.6/bits/stl_vector.h:350
#9  gr::filter::firdes::low_pass (gain=<optimized out>,
    sampling_freq=<optimized out>, cutoff_freq=0.45000000000000001,
    transition_width=<optimized out>, window_type=<optimized out>,
    beta=<optimized out>) at /home/pi/gnuradio/gr-filter/lib/firdes.cc:136

firdes.cc:136 is the closing bracket of the for loop that iterates over 
both the taps vector and the window vector.
sadly, gdb doesn't tell us whether the w or the taps vector's destructor 
is being called.
As a wild guess, the compiler realised w is not being used after the 
last iteration of the loop in the low_pass function.
Proposal:
do a

gdb --args python top_block.py #or whatever your file is called
gdb>break /home/pi/gnuradio/gr-filter/lib/firdes.cc:136
gdb>run
##at some point, the breakpoint will be reached.

and check if it crashes on the first run, on the last or whenever.

Basically: It's a curious thing that this happens. I do not rule out 
strange and wilde and generally untame things happening in memory here!

Greetings, and look out for memory grues,

Marcus

On 15.11.2013 12:13, Frederik Wing wrote:
> Hi everyone,
>
> I am using the latest GNU Radio version compiled and running on a
> Raspberry Pi with Raspbian Wheezy.
> Most of the blocks seem to work. But the Rational Resampler makes problems.
>
> Here is my sample python script generated by GNU Radio Companion:
> http://pastebin.com/R0Z21MfU
>
> Running it throws the error:
> *** glibc detected *** /usr/bin/python2: double free or corruption
> (!prev): 0x02bee190 ***
>
> Debugging it with gdb gives the output here: http://pastebin.com/rXqtkZVG
>
> Any ideas how to solve this?
>
> Yours,
> Frederik
>
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