[issue920] Incomplete backtrace in gdb
Simon 'corecode' Schubert
corecode at fs.ei.tum.de
Wed Jan 16 13:12:01 PST 2008
Simon 'corecode' Schubert wrote:
With current HEAD and gdb 6.7.1 I can't get complete backtraces any
more. Example from Xorg.core:
could you supply the core and binary for debugging?
I received both from hasso privately.
I have to say that gdb is not really at fault here. Thorough
#7 0x0807b766 in ?? ()
This function really doesn't exist. Well, it does, but it doesn't have a
visible symbol. Because of this, gdb can't analyze the function prologue
and thus assumes that there is nothing on the stack - of course this is
wrong. We could change gdb to assume that there is always a stack frame
and this way it could work better for this case.
Previous gdb versions mistakenly assumed a different calling function and
happily unwound the prologue of the wrong function. This led to better
backtraces, but possibly wrong ones.
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