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From: Gene Heskett <>
To: "" <>
Subject: Re: Crash tool issue since printk re-implementation
Date: Fri, 14 Feb 2020 09:11:36 -0500
Message-ID: <> (raw)
In-Reply-To: <>

On Friday 14 February 2020 08:42:57 John Ogness wrote:

> On 2020-02-14, Sebastian Andrzej Siewior <> wrote:
> > On 2020-02-12 12:10:23 [+0000], Sebastien Fabre wrote:
> >> Since kernel v5.0, PREEMPT_RT patches contain printk
> >> re-implementation. This re-implementation removes some log symbols
> >> in VMCOREINFO and crash tool cannot retrieve kernel logs (because
> >> symbols no more exist).  Is this impact on crash expected? If so,
> >> how can we retrieve a functional crash tool with kernel v5.0 (and
> >> following) ?
> >
> > It is known, yes. I'm aware of crash and the gdb scritps should also
> > suffer from this.
> Perhaps this should be listed under the "Known issues" of the
> PREEMPT_RT release announcements.
> John Ogness

I would like to agree, as I think that explains why an attempt to build 
5+ in this preempt-rt flavor, on an rpi4, for an rpi4 has been a no boot 

Plus it appears I'd have to replace the bootloader because raspian puts 
the overlays in a /boot/overlays subdir whereas you are putting them 
in /boot (I think, I haven't found the .config magic twanger that puts 
them in the overlays subdir.)

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <>

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 12:10 Sebastien Fabre
2020-02-14 12:34 ` Sebastian Andrzej Siewior
2020-02-14 13:42   ` John Ogness
2020-02-14 14:11     ` Gene Heskett [this message]

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