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Re: [HELP] ubacktrace() problem
- From: "Frank Ch. Eigler" <fche at redhat dot com>
- To: Jinhua Luo <luajit dot io at gmail dot com>
- Cc: systemtap at sourceware dot org
- Date: Wed, 13 Jan 2016 10:23:12 -0500
- Subject: Re: [HELP] ubacktrace() problem
- Authentication-results: sourceware.org; auth=none
- References: <CAAc9rOzFmkSKJCmi=0=Vggvaf3-VnwgfHFPfBxG475NKso3arQ at mail dot gmail dot com> <y0m7fje98cy dot fsf at fche dot csb> <CAAc9rOxJNeVvyjeRX==GpNU9H=Sh+AfFUgLtLPqxFpWJnj_K3w at mail dot gmail dot com>
Hi -
> > % rpm -ql kernel-debuginfo | grep vdso
> > /usr/lib/debug/lib/modules/4.2.6-200.fc22.x86_64/vdso
> > [...]
> > These may be necessary to be able to unwind through the kernel-user
> > transition [...]
>
> Thanks for the information! The debian indeed lacks of vdso files in
> the kernel package.
Please let us know when/if a debian bug is opened, so we can track it.
> [...] I am still wondering if the warnings denotes that the
> collected backtraces are not so accurate and complete.
Well, they will be as accurate and complete as systemtap can make it,
with the imperfect data it is given. Use the warnings to help (us)
diagnose known problem cases, otherwise please don't worry about them.
- FChE