.
Thread 2 (process 9975):
#0  _int_free (av=0x7fab92bbba00, mem=0x2043060) at malloc.c:4749
	p = (mchunkptr) 0x203e470
	size = 19776
	nextchunk = (mchunkptr) 0x20430c0
	nextsize = 240
	prevsize = <value optimized out>
	bck = <value optimized out>
	fwd = (mchunkptr) 0x204b8d0
	errstr = 0x0
#1  0x00007fab928c8276 in *__GI___libc_free (mem=0x2043060) at malloc.c:3625
	ar_ptr = (mstate) 0x7fab92bbba00
	p = <value optimized out>
	hook = <value optimized out>
#2  0x000000000067b5a6 in zend_hash_del_key_or_index (ht=0x1fe03a0, 
    arKey=0x8d3c2f "r", nKeyLength=20, h=3308248212, flag=33828960)
    at /build/buildd/php5-5.2.6.dfsg.1/Zend/zend_hash.c:685
	p = (Bucket *) 0x2043060
#3  0x000000000067358f in zend_unregister_functions (
    functions=0x7fab92bbba00, count=-1, function_table=0x204b8d0)
    at /build/buildd/php5-5.2.6.dfsg.1/Zend/zend_API.c:1866
	ptr = (zend_function_entry *) 0xb71ae0
	i = 57
	target_function_table = (HashTable *) 0x1fe03a0
#4  0x00007fff9d98df21 in ?? ()
#5  0x0000000000000000 in ?? ()
.
Thread 1 (process 9979):
#0  0x00007fab91c794ef in ?? () from /lib/libgcc_s.so.1
#1  0x00007fab91c79e3b in ?? () from /lib/libgcc_s.so.1
#2  0x00007fab91c79f43 in _Unwind_ForcedUnwind () from /lib/libgcc_s.so.1
#3  0x00007fab94517710 in __pthread_unwind () from /lib/libpthread.so.0
#4  0x00007fab94511b05 in pthread_exit () from /lib/libpthread.so.0
#5  0x00007fab8dd1ff3b in ?? ()
#6  0x0000000000000000 in ?? ()