Re: [PATCH v3 04/12] module: Add printk format to add module build ID to stacktraces

Andy Shevchenko
2021-04-07T15:07:23Z

On Wed, Apr 07, 2021 at 04:54:33PM +0200, Petr Mladek wrote:
> On Tue 2021-03-30 20:05:12, Stephen Boyd wrote:
> > Let's make kernel stacktraces easier to identify by including the build
> > ID[1] of a module if the stacktrace is printing a symbol from a module.
> > This makes it simpler for developers to locate a kernel module's full
> > debuginfo for a particular stacktrace. Combined with
> > scripts/decode_stracktrace.sh, a developer can download the matching
> > debuginfo from a debuginfod[2] server and find the exact file and line
> > number for the functions plus offsets in a stacktrace that match the
> > module. This is especially useful for pstore crash debugging where the
> > kernel crashes are recorded in something like console-ramoops and the
> > recovery kernel/modules are different or the debuginfo doesn't exist on
> > the device due to space concerns (the debuginfo can be too large for
> > space limited devices).

...

> It shows wrong build id for vmlinux.
> And it does not show the build if for the module at all.

From your previous messages and this seems like virtualization breaks the
access / use of build ID :-(

--
With Best Regards,
Andy Shevchenko