[PD] flext glibc double free or corruption

[Johannes Burström]

Hi

after updating my debian installation (including 1ibc6) i suddenly 
started to have problems with pool. i have narrowed it down to this: 
closing pd after invoking [pool] in a patch, IF the xsample library is 
loaded, makes pd crash with the following message:

*** glibc detected *** double free or corruption (fasttop): 0x082d8ea8 ***

Sometimes this happens when just deleting an abstraction containing 
[pool]. I haven't been able to find a way to reproduce this, however.

the bt of gdb shows this:

0x40417861 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x40417861 in kill () from /lib/libc.so.6
#1  0x402b4309 in pthread_kill () from /lib/libpthread.so.0
#2  0x402b46c0 in raise () from /lib/libpthread.so.0
#3  0x40417616 in raise () from /lib/libc.so.6
#4  0x40418981 in abort () from /lib/libc.so.6
#5  0x4044a960 in __fsetlocking () from /lib/libc.so.6
#6  0x404502e9 in malloc_usable_size () from /lib/libc.so.6
#7  0x40450d81 in free () from /lib/libc.so.6
#8  0x4061e9d8 in flext_root_single::operator delete () from 
/usr/local/lib/pd/extra/xsample.pd_linux
#9  0x4061bfaf in flext_base_single::AddOutlets () from 
/usr/local/lib/pd/extra/xsample.pd_linux
#10 0x40419ade in exit () from /lib/libc.so.6
#11 0x4040441b in __libc_start_main () from /lib/libc.so.6
#12 0x08059261 in _start () at ../sysdeps/i386/elf/start.S:119

this is on devel 0_39, checked out today, and a recent (i believe 
yesterday) flext checkout, all compiled today.

If related somehow, the libc6 is 2.3.5-7, from unstable, the testing 
2.3.5-6 had the same problem, while i didn't have this issue with 
2.3.2.ds1-22 (_if_ it's related - if this will continue i guess i'll try 
to downgrade to see if it disappears).

i'd be grateful if anyone had any clues on how to solve this.

Johannes