[DTrace-devel] Dtrace on Linux Port

[Paul Dagnelie]

Thanks for figuring it out so quickly, and glad to hear you've already got
a fix in mind. I'll keep an eye out for the fix, and go back to tinkering
when it's landed. Thanks for your help!

On Tue, Mar 6, 2018 at 3:47 AM, Nick Alcock <nick.alcock at oracle.com> wrote:

> On 5 Mar 2018, Paul Dagnelie told this:
>
> > Hey Nick, I've attached the .config file so you can try to reproduce
> it.  I
> > think it's unlikely that ZFS is related; I installed the zfs modules
> > separately from source, they're not in the tree that dwarf2ctf is in.
> I'll
> > also add the debug flag to dwarf2ctf and rerun the build; once I have it
> > compressed, if I have a convenient place to host it, I'll do that and let
> > you know.
>
> Thanks! Replicated.
>
> This is a type table overflow. CTF has a limit of 2^15 types in parent
> tables (for us, one: shared_ctf) and 2^15 in unshared tables. Until
> yesterday I thought hitting this was a purely theoretical risk, but
> yesterday I hit it in an allmodconfig build.
>
> You've hit it too. I'm afraid the only workaround is to use a smaller
> .config :/
>
> The message it prints is a giveaway if you know what you're looking at:
>
> ../drivers/net/ethernet/qlogic/qed/qed_hsi.h:9245:iwarp: Internal error:
> Invalid type identifier shared_ctf:drivers/net/ethernet/qlogic/qed/qed.ko:0x2090ae0:32768
> on member addition to ctf_file 0x2090ae0.
>
> that 32768 there is the type ID. It's 2^15...
>
> In a nice example of psychic development I'm working on a fix for this
> already, in the shape of libdtrace-ctf changes that add a new file
> format that bumps up the type ID sizes to 64 bits, which should be
> enough for a while: I'll bump the priority up since I'm not the only
> person it affects. I am always wary of saying when things will be ready
> by, but I should have something for you soon unless something else gets
> in my way at higher priority!
>
> I'm sorry that something so fundamental has got in your way, but this
> limitation *will* be lifted, and soon.
>



-- 
Paul Dagnelie
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