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Re: copy faults from user_string* functions
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: Eric Wong <normalperson at yhbt dot net>
- Cc: Systemtap List <systemtap at sourceware dot org>
- Date: Fri, 26 Jul 2013 13:07:53 -0400
- Subject: Re: copy faults from user_string* functions
- References: <20130726063634 dot GA32443 at dcvr dot yhbt dot net>
Hi, Eric -
normalperson wrote:
> Hi all, just to clarify, not all of these faults are user errors, right?
> I get these sometimes with some strings (constants, I think):
> ERROR: user string copy fault -14 at 000000000042f16c near identifier 'user_string_n' at $prefix/share/systemtap/tapset/uconversions.stp:120:10
> [...]
It can simply mean having some not-yet-paged-in data, which in the
spirit of non-interference, stap will not trigger a page fault for.
Please try error-catching constructs such as try{}catch{}, or
--skip-badvars to tolerate them.
> This is for cmogstored, if anybody is interested in reproducing this,
> I've pushed my work-in-progress to the "st-wip-broken" branch of
> git://bogomips.org/cmogstored.git The HACKING doc in the top-level
> should document all the build-dependencies if you want to try to
> reproduce it.
Neat.
- FChE