Re: kern/16284 running function in stoped gdb ...

[David Holland <dholland-bugs%netbsd.org@localhost>]

On Sun, Jan 03, 2010 at 09:10:06PM +0000, David Laight wrote:
 >  This still happens, errno is unchanged and the 'ret' value
 >  from select() seems to be undefined.

My first guess would be that something in gdb that thinks %eax doesn't
have to be saved and restored (because it's caller-save) is trashing
the return value (which is held in %eax).

 >  Sometimes, but not always, I also see almost 2 seconds delay before
 >  the output from the called function - not sure where that delay comes from.

maybe another trip into select?

 >  (A 2nd ^C gives a "Corrupt Obj_Entry pointer in GOT" error.)

That's weird.

 >  Anyone know the ptrace interface well enough to know what gdb is
 >  trying to do ?

Not without reading gdb code.

-- 
David A. Holland
dholland%netbsd.org@localhost