[Devel] memory problem in pa module

[=?gb2312?B?U0lQsK66w9Xf?=]

I modify the PA module, when SER recieve "REGISTER". It will find_prentity, if no presentity found, we create a new one, and then register the callback function. but when the user unregister, we get a error. the detail error infomation is following.

thanks.

=================error infomation======================  
 9(16480) pa_handle_registration: from=sip:75 at 192.168.20.242 p_uri=75 at 192.168.20.242 expires=3600
 9(16480) pa_handle_registration: find_presentity did not find presentity
 9(16480) pa_handle_registration: create_presentity_only 
 9(16480) pa_handle_registration about to call d->reg p=0xb5457ed4 expires=3600 9(16480) pa_handle_registration about to return 111(16482) in callback: uri=75 at 192.168.20.242 contact=sip:75 at 192.168.20.114:9367;transport=udp state=0
 9(16480) new_presentity=0xb5457ed4 for uri=75 at 192.168.20.242
 9(16480) add_presentity _p=0xb5457ed4 p_uri=75 at 192.168.20.242
 9(16480) in callback: uri=75 at 192.168.20.242 contact=sip:75 at 192.168.20.114:9367;transport=udp state=1
 9(16480) in callback callback_lock_pdomain = 1
 9(16480) find_presence_tuple: _p=0xb5457ed4 _p->tuples=(nil)
 9(16480) in callback after find_presence_tuple
 9(16480) in callback before new_presence_tuple
 9(16480) new_tuple=0xb5457f88 for aor=75 at 192.168.20.242 contact=sip:75 at 192.168.20.114:9367;transport=udp
 9(16480) in callback before add_presence_tuple
 9(16480) in callback before db_update_presentity
 9(16480) in callback after db_update_presentity
 9(16480) in callback leave callback
11(16482) in callback callback_lock_pdomain = 1
11(16482) find_presence_tuple: _p=0xb5457ed4 _p->tuples=0xb5457f88
11(16482) in callback after find_presence_tuple
11(16482) in callback before db_update_presentity
11(16482) in callback after db_update_presentity
11(16482) in callback leave callback
11(16482) BUG: qm_*: prev. fragm. tail overwritten(c0c0c000, abcdefed)[0xb5457e28:0xb5457e40]!
 0(16471) child process 16482 exited by a signal 6
 0(16471) core was not generated
 0(16471) INFO: terminating due to SIGCHLD
 1(16472) INFO: signal 15 received
 2(16473) INFO: signal 15 received
 4(16475) INFO: signal 15 received
 5(16476) INFO: signal 15 received
 6(16477) INFO: signal 15 received
 7(16478) INFO: signal 15 received
 9(16480) INFO: signal 15 received
 8(16479) INFO: signal 15 received
10(16481) INFO: signal 15 received
12(16483) INFO: signal 15 received
13(16484) INFO: signal 15 received
14(16485) INFO: signal 15 received
15(16486) INFO: signal 15 received
16(16487) INFO: signal 15 received
17(16488) INFO: signal 15 received
18(16489) INFO: signal 15 received
19(16490) INFO: signal 15 received
20(16491) INFO: signal 15 received
21(16492) INFO: signal 15 received
22(16493) INFO: signal 15 received
23(16494) INFO: signal 15 received
24(16495) INFO: signal 15 received
25(16496) INFO: signal 15 received
26(16497) INFO: signal 15 received
 3(16474) INFO: signal 15 received
 0(16471) BUG: shutdown timeout triggered, dying... 

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