free() problemen opsporen (lang bericht)

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1 total messages Started by Aquila Mon, 24 Jan 2005 16:27

#1613

Author: Aquila
Date: Mon, 24 Jan 2005 16:27

83 lines
4825 bytes

Ik zit in een simulator te werken (nsclick) maar ik krijg foutmeldingen in
deze aard:
free(): invalid pointer 0x87382a8!
Ik heb dus valgrind gestart, en addrcheck geeft hetvolgende resultaat na het
afbreken van de uitvoering:

==24538== ERROR SUMMARY: 22 errors from 2 contexts (suppressed: 0 from 0)
==24538== 
==24538== 11 errors in context 1 of 2:
==24538== Invalid read of size 4
==24538==    at 0x823D551: Click::HashMap<Click::IPAddress,
Click::WaitingPackets>::find_pair(Click::IPAddress const&) const
(ipaddress.hh:189)
==24538==    by 0x823C9FD:
Click::AODVWaitingForDiscovery::runTask(Click::IPAddress const&,
Click::AODVWaitingForDiscovery::TimerData*)
(aodv_waitingfordiscovery.cc:82)
==24538==    by 0x823CC21:
Click::AODVWaitingForDiscovery::handleTask(Click::Timer*, void*)
(aodv_waitingfordiscovery.cc:115)
==24538==    by 0x82101C2: Click::Master::run_timers() (master.cc:380)
==24538==  Address 0x3450F474 is 4 bytes inside a block of size 8 free'd
==24538==    at 0x34149A52: operator delete(void*) (vg_replace_malloc.c:156)
==24538==    by 0x823C936:
Click::AODVWaitingForDiscovery::runTask(Click::IPAddress const&,
Click::AODVWaitingForDiscovery::TimerData*)
(aodv_waitingfordiscovery.cc:69)
==24538==    by 0x823CC21:
Click::AODVWaitingForDiscovery::handleTask(Click::Timer*, void*)
(aodv_waitingfordiscovery.cc:115)
==24538==    by 0x82101C2: Click::Master::run_timers() (master.cc:380)
==24538== 
==24538== 11 errors in context 2 of 2:
==24538== Invalid read of size 4
==24538==    at 0x823D5B3: Click::HashMap<Click::IPAddress,
Click::WaitingPackets>::remove(Click::IPAddress const&) (ipaddress.hh:189)
==24538==    by 0x823C9EE:
Click::AODVWaitingForDiscovery::runTask(Click::IPAddress const&,
Click::AODVWaitingForDiscovery::TimerData*)
(aodv_waitingfordiscovery.cc:81)
==24538==    by 0x823CC21:
Click::AODVWaitingForDiscovery::handleTask(Click::Timer*, void*)
(aodv_waitingfordiscovery.cc:115)
==24538==    by 0x82101C2: Click::Master::run_timers() (master.cc:380)
==24538==  Address 0x3450F474 is 4 bytes inside a block of size 8 free'd
==24538==    at 0x34149A52: operator delete(void*) (vg_replace_malloc.c:156)
==24538==    by 0x823C936:
Click::AODVWaitingForDiscovery::runTask(Click::IPAddress const&,
Click::AODVWaitingForDiscovery::TimerData*)
(aodv_waitingfordiscovery.cc:69)
==24538==    by 0x823CC21:
Click::AODVWaitingForDiscovery::handleTask(Click::Timer*, void*)
(aodv_waitingfordiscovery.cc:115)
==24538==    by 0x82101C2: Click::Master::run_timers() (master.cc:380)
==24538== IN SUMMARY: 22 errors from 2 contexts (suppressed: 0 from 0)


Aan de eerste fout kan ik spijtig genoeg niet veel doen wegens te weinig
tijd, maar dit is Click::AODVWaitingForDiscovery::runTask:
void AODVWaitingForDiscovery::runTask(const IPAddress & destination,
TimerData* data){
 Buffer::Pair* pair = buffer.find_pair(destination);
 assert(pair); 
 assert(!pair->value.timer->scheduled());
 
 ++pair->value.nrOfRetries;
 if (pair->value.maxTTL){
  if(pair->value.nrOfRetries == AODV_RREQ_RETRIES){
   delete(pair->value.timer);
   delete data; // <-- lijn 69
   
Die TimerData zelf is deze struct:
struct TimerData{
   AODVWaitingForDiscovery* waitingForDiscovery;
   IPAddress destination;
  };
Een ingewikkelde situatie ik besef het: dit zijn data voor de static
callbackfunctie die wordt opgeroepen als de timer afloopt.
Waarom is dit nu fout voor valgrind?

Alle hulp is meer dan welkom...
-- 
"May the source be with you"

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