Re: [Crash-utility] [PATCH] ARM: corrupted pages tables vs unwind

On Sat, Jan 28, 2012 at 03:36:28PM +0530, Rabin Vincent wrote: > I have access to a system whose crashdump extraction mechanism > unfortunately trashes the first few hundred kilobytes of physical > memory, which includes the page tables at swapper_pg_dir. > > crash does chug along and remains quite useful without these page tables > since much of the interesting information is in the direct mapped > region, but it disables the use of the unwind tables because it > fails to read the module unwind tables, which are placed at a > non-direct-mapped address. > > The patch below allows unwind tables to be used only for core kernel > addresses if the module tables are inaccessible. > > Alternatively, we could perhaps not attempt to read the > module unwind tables when --no_modules is specified. IMHO crash should at least try to allow user to perform analysis even if it cannot do V<->P translations via page tables. The patch looks good and makes ARM port of crash a bit more tolerant so, Acked-by: Mika Westerberg <mika.westerberg(a)iki.fi&gt; Thanks!

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