osx - OS X: Two-machine GDB debugging results in frequent hangs -


i'm debugging kext on target system running 10.8.5 host (also running 10.8.5) using gdb on ethernet. on target, nvram boot-args settings are: 

debug=0x115 -v pmuflags=1

however, pmuflags=1, still see debugger hang when single-step breakpoint. problem happens , resolution have power-cycle target , start over.

what causing these hangs , else can keep them happening?

i'm posting developer running same situation:

"when asked single-step lockups in kernel debug targets 4 years ago, there no feedback @ apple. lockups happen. others experience them. maybe noone @ apple single steps in ethernet gdb kernel debug sessions. played around firewire debugging when first experienced this, gave reasons can no longer remember. have gotten used less when comes kernel debugging on osx."

looks single-stepping through gdb far perfect.


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