[lldb-dev] Unreliable process attach on Linux

[Zachary Turner via lldb-dev]

I'd be curious to see if the PID of the process that is failed to attach to
is the same as one of the PIDs of a process that was previously attached to
(and if so, if it is the first such case where a PID is recycled).

On Sat, Jan 5, 2019 at 4:42 AM Florian Weimer via lldb-dev <
lldb-dev at lists.llvm.org> wrote:

> * Jan Kratochvil:
>
> > On Fri, 04 Jan 2019 17:38:42 +0100, Florian Weimer via lldb-dev wrote:
> >> Run it in a loop like this:
> >>
> >> $ while ./test-attach ; do date; done
> >>
> >> On Linux x86-64 (Fedora 29), with LLDB 7 (lldb-7.0.0-1.fc29.x86_64) and
> >> kernel 4.19.12 (kernel-4.19.12-301.fc29.x86_64), after 100 iterations or
> >> so, attaching to the newly created process fails:
> >>
> >> test-attach: SBTarget::Attach failed: lost connection
> >
> > FYI after 30000 runs it still runs fine with your reproducer both with
> system
> > lldb-devel-7.0.0-1.fc29.x86_64 and COPR
> > lldb-experimental-devel-8.0.0-0.20190102snap0.fc29.x86_64 (=trunk), part
> > running without /usr/lib/debug and part with.
>
> Well, that's odd.  Shall I try to reproduce this on a lab machine?
>
> > Fedora 29 x86_64 + kernel-4.19.10-300.fc29.x86_64
> >
> > (I haven't investigated the code why it could fail this way.)
>
> First, I want to get more logging data out of LLDB.  Maybe this will
> tell us where things go wrong.
>
> Thanks,
> Florian
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