[ovs-dev] [PATCH] fatal-signal: Catch SIGSEGV and print backtrace.

William Tu u9012063 at gmail.com
Wed Sep 18 20:16:37 UTC 2019

Thanks for the feedback.

On Wed, Sep 18, 2019 at 11:30 AM Ben Pfaff <blp at ovn.org> wrote:
> On Tue, Sep 17, 2019 at 04:13:24PM -0700, William Tu wrote:
> > The patch catches the SIGSEGV signal and prints the backtrace
> > using libunwind, hopefully makes it easier to debug.
> >
> > Signed-off-by: William Tu <u9012063 at gmail.com>
> I guess my experience is that this sort of thing is sometimes useful but
> ultimately causes problems because it tries to call a lot of functions
> that a signal handler is not supposed to call.

Do you mean the show_backtrace() tries to call too many functions?
What's the concern about calling lots of functions in a signal handler?

> It might be a good idea to put some of this in lib/backtrace.[ch] and
> provide some way to enable it at runtime.

I'm hoping this can be enabled by default, so debugging on systems
without ovs debug symbol package or gdb is easier.


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