Re: SEGV in dwarf2read.c -- gdb-7.2

Jan Kratochvil
2011-11-03T17:22:54Z

On Thu, 03 Nov 2011 18:13:04 +0100, Michael Eager wrote:
> With the addition of the call to age_cached_comp_units() in
> dwarf2_fetch_die_location_block() and dw2_do_instantiate_symtab(),
> I think that the cache is aged very aggressively.

> With dwarf2_max_cache_age == 5, it looks to me that it is likely that CU
> data will not be in the cache when needed.

There was for example this fix:
http://sourceware.org/ml/gdb-patches/2011-07/msg00495.html

which is not yet even in 7.3.1 as I see now, it is only in FSF GDB HEAD.

wrt CUs aging therefore only FSF GDB HEAD matters, older releases are known to
be buggy - at least due to this bug.

With FSF GDB HEAD I am not aware of any problems because any call to
age_cached_comp_units is done when CUs are no longer needed anywhere.

I do not discuss here about efficiency of the FSF GDB HEAD solution but I am
not aware of how it could crash any way.

Thanks,
Jan