Hi there,
First, thanks for the great piece of software!
I am a happy user of Shapely since a few years, but since I upgraded
my server to Ubuntu 9.10 I notice the following message everytime I my
Python application ends:
*** glibc detected *** python: double free or corruption (!prev):
0x00000000018839b0 ***
Also, the process hangs and never completes. This problem is
particularly painful when Python is run as a CGI within Apache, as
HTTP requests will never complete. Otherwise on the command-line, I
just issue a CTRL-C to stop it.
Software that has changed during the Ubuntu upgrade includes:
* Python, from 2.6.2 to 2.6.4
* Libgeos, from 3.0.0 to 3.1.0
I tried to upgrade shapely from 1.0.11 to 1.0.14 with no luck.
Note that I also use python-mapscript, the package that comes with
mapserver, also using libgeos. I verified that only one version of
libgeos is installed and used.
Here is the gdb backtrace during the hang:
#0 __lll_lock_wait_private () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1 0x00007f238c6c7b11 in _L_lock_9274 () from /lib/libc.so.6
#2 0x00007f238c6c5741 in *__GI___libc_free (mem=0x7f238c9b5e40) at
malloc.c:3714
#3 0x00007f238d48ab32 in _dl_scope_free (old=0xf6e5b0) at dl-open.c:175
#4 0x00007f238d485035 in _dl_map_object_deps (map=0x7f238d697530,
preloads=<value optimized out>, npreloads=<value optimized out>,
trace_mode=<value optimized out>, open_mode=<value optimized out>) at
dl-deps.c:668
#5 0x00007f238d48ada3 in dl_open_worker (a=<value optimized out>) at
dl-open.c:326
#6 0x00007f238d486386 in _dl_catch_error (objname=<value optimized
out>, errstring=<value optimized out>, mallocedp=<value optimized
out>, operate=<value optimized out>, args=<value optimized out>) at
dl-error.c:178
#7 0x00007f238d48a6c7 in _dl_open (file=0x7f238c77e2ae
"libgcc_s.so.1", mode=-2147483647, caller_dlopen=0x0, nsid=-2, argc=1,
argv=0x18, env=0xafed90) at dl-open.c:615
#8 0x00007f238c767c00 in do_dlopen (ptr=0x7ffff3913b10) at dl-libc.c:86
#9 0x00007f238d486386 in _dl_catch_error (objname=<value optimized
out>, errstring=<value optimized out>, mallocedp=<value optimized
out>, operate=<value optimized out>, args=<value optimized out>) at
dl-error.c:178
#10 0x00007f238c767d57 in dlerror_run (name=<value optimized out>,
mode=<value optimized out>) at dl-libc.c:47
#11 *__GI___libc_dlopen_mode (name=<value optimized out>, mode=<value
optimized out>) at dl-libc.c:160
#12 0x00007f238c7426e5 in init () at ../sysdeps/x86_64/../ia64/backtrace.c:41
#13 0x00007f238d2687a3 in pthread_once () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_once.S:94
#14 0x00007f238c7427e4 in *__GI___backtrace (array=<value optimized
out>, size=64) at ../sysdeps/x86_64/../ia64/backtrace.c:79
#15 0x00007f238c6b6cab in __libc_message (do_abort=<value optimized
out>, fmt=<value optimized out>) at
../sysdeps/unix/sysv/linux/libc_fatal.c:168
#16 0x00007f238c6c0dd6 in malloc_printerr (action=3,
str=0x7f238c7827b0 "double free or corruption (!prev)", ptr=<value
optimized out>) at malloc.c:6217
#17 0x00007f238c6c574c in *__GI___libc_free (mem=<value optimized
out>) at malloc.c:3716
#18 0x00007f2384a5130b in msGEOSCleanup () from
/usr/lib/python2.6/dist-packages/_mapscript.so
#19 0x00007f2384969fda in msCleanup () from
/usr/lib/python2.6/dist-packages/_mapscript.so
#20 0x00000000004c2cc2 in call_ll_exitfuncs () at ../Python/pythonrun.c:1705
#21 Py_Finalize () at ../Python/pythonrun.c:534
#22 0x00000000004185c2 in Py_Main (argc=<value optimized out>,
argv=<value optimized out>) at ../Modules/main.c:625
#23 0x00007f238c669abd in __libc_start_main (main=<value optimized
out>, argc=<value optimized out>, ubp_av=<value optimized out>,
init=<value optimized out>, fini=<value optimized out>,
rtld_fini=<value optimized out>, stack_end=0x7ffff3914738) at
libc-start.c:220
#24 0x0000000000417ca9 in _start () at ../sysdeps/x86_64/elf/start.S:113
I have no clue where the problem comes from, however, when I edit the
installed python2.6/shapely/geos.py module and comment the cleanup
code, Python does not crash anymore:
def cleanup():
if lgeos is not None:
pass
#lgeos.finishGEOS()
Any idea? Your help will be much appreciated.
--
Jean-Baptiste Quenot
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