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copy faults from user_string* functions
- From: Eric Wong <normalperson at yhbt dot net>
- To: Systemtap List <systemtap at sourceware dot org>
- Date: Fri, 26 Jul 2013 06:36:34 +0000
- Subject: copy faults from user_string* functions
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
I'm using systemtap release-2.3-1-g5033017
Things are heavily multi-threaded and there's an occasional fork/exec
happening for iostat.
Without systemtap, valgrind runs the test suite fine, so it's less
likely to be a bug in the code.
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.
Once built and all the dev dependencies installed, I just run:
stap -v tapset/all.stp
And in another terminal: make -jXX check
(note: having slow mount points may increase the chance of test suite
failure since it needs to scan mount points for disk usage reports and
iostat device name <-> MogileFS devid mapping)
Thanks for reading!