Deadlock problem

HI,
I have asterisk Ver. Asterisk SVN-branch-1.2-r37224M

Please tell me what is deadlock

Facing too much problem while dialing out numbers, I have to dial out 2-3 attempts to dial single number, however on other asterisk machine i can dial in single hit with same VoIP provider same ISP bandwith,
in logs i am continuously receiving following error, its in huge amount

Sep 18 12:37:38 DEBUG[17219] channel.c: Avoiding deadlock for ‘Local/78600064@dialer-cc69,1’

Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600058@dialer-0f40,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600058@dialer-0f40,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for 'Local/78600064@dialer-b928,1’
Sep 18 12:53:54 DEBUG[17219] channel.c: Avoiding deadlock for ‘Local/78600064@dialer-b928,1’

Help me to solve this problem,

Thanks in Advance,