Re: seg fault with repeated function calls from C?

[Anand Dixit]

Hi Andy,
 
  Here is the output from 'gdb fdtd core' (fdtd is the excutable name).
Another point to note: I had similar problems with the scm_c_eval_string
command - it would also give me segmentation fault after some
iterations. scm_call allows for more evaluations before failing. Let me
know if you want me to try some other command.

--------------------
This GDB was configured as "x86_64-linux-gnu"...

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /usr/lib/libguile.so.17...done.
Loaded symbols for /usr/lib/libguile.so.17
Reading symbols from /usr/lib/libltdl.so.3...done.
Loaded symbols for /usr/lib/libltdl.so.3
Reading symbols from /usr/lib/libgmp.so.3...done.
Loaded symbols for /usr/lib/libgmp.so.3
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libnsl.so.1...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /usr/lib/libstdc++.so.6...done.
Loaded symbols for /usr/lib/libstdc++.so.6
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /usr/lib/libguilereadline-v-17.so.17...done.
Loaded symbols for /usr/lib/libguilereadline-v-17.so.17
Reading symbols from /lib/libreadline.so.5...done.
Loaded symbols for /lib/libreadline.so.5
Reading symbols from /lib/libncurses.so.5...done.
Loaded symbols for /lib/libncurses.so.5
Core was generated by `fdtd poisson.ctl'.
Program terminated with signal 11, Segmentation fault.
[New process 12395]
#0  0x00007f18eff3b49b in scm_gc_mark () from /usr/lib/libguile.so.17
(gdb) bt
#0  0x00007f18eff3b49b in scm_gc_mark () from /usr/lib/libguile.so.17
#1  0x00007f18eff3b3c7 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#2  0x00007f18eff3b3c7 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#3  0x00007f18eff3b241 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#4  0x00007f18eff3b2d6 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#5  0x00007f18eff3b241 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#6  0x00007f18eff3b2d6 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#7  0x00007f18eff3b241 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#8  0x00007f18eff3b2d6 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#9  0x00007f18eff3b3c7 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#10 0x00007f18eff3b241 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#11 0x00007f18eff3b2d6 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#12 0x00007f18eff3b3c7 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#13 0x00007f18eff3b241 in scm_gc_mark_dependencies ()
from /usr/lib/libguile.so.17
#14 0x00007f18eff814a3 in scm_threads_mark_stacks ()
from /usr/lib/libguile.so.17
#15 0x00007f18eff3b598 in scm_mark_all () from /usr/lib/libguile.so.17
#16 0x00007f18eff3a64a in scm_i_gc () from /usr/lib/libguile.so.17
#17 0x00007f18eff3a84e in scm_gc_for_newcell ()
from /usr/lib/libguile.so.17
#18 0x00007f18eff5a3e5 in scm_cons () from /usr/lib/libguile.so.17
#19 0x00007f18eff5a3ff in scm_cons2 () from /usr/lib/libguile.so.17
#20 0x00007f18eff2fee5 in scm_call_4 () from /usr/lib/libguile.so.17
#21 0x00000000004288ab in Esource::fixE (this=0xe04b80) at
esource.hpp:61
#22 0x0000000000423b4a in inner_main (argc=<value optimized out>,
argv=0x7ffff83f3dd8)
---Type <return> to continue, or q <return> to quit---
    at fdtd.cpp:722
#23 0x00007f18eff3e99e in ?? () from /usr/lib/libguile.so.17
#24 0x00007f18eff48caf in ?? () from /usr/lib/libguile.so.17
#25 0x00007f18eff2119a in ?? () from /usr/lib/libguile.so.17
#26 0x00007f18eff82865 in scm_c_catch () from /usr/lib/libguile.so.17
#27 0x00007f18eff215b6 in scm_i_with_continuation_barrier ()
from /usr/lib/libguile.so.17
#28 0x00007f18eff21650 in scm_c_with_continuation_barrier ()
from /usr/lib/libguile.so.17
#29 0x00007f18eff81ce3 in scm_i_with_guile_and_parent ()
from /usr/lib/libguile.so.17
#30 0x00007f18eff48c75 in scm_boot_guile () from /usr/lib/libguile.so.17
#31 0x0000000000417dee in main (argc=0, argv=0x10000000000) at
fdtd.cpp:1005

--------------------------
 Thanks,
   - Anand

On Tue, 2008-12-16 at 23:23 +0100, Andy Wingo wrote:
> On Tue 16 Dec 2008 18:17, Anand Dixit <address@hidden> writes:
> 
> >>    I am calling a guile function from my C code. Its a fairly straight
> >> forward implementation. However, as I keep calling this function a
> >> number of times, it breaks at some point with a segmentation fault. Here
> >> is the relevant portion :
> 
> Can we see a C-level backtrace? Things look OK to me on first glance.
> 
> Andy