Re: [PATCH] kexec/crash: no crash update when kexec in progress

[Sourabh Jain]

Hello Baoquan,

On 01/08/24 13:13, Baoquan He wrote:
> On 07/31/24 at 08:57pm, Sourabh Jain wrote:
> > The following errors are observed when kexec is done with SMT=off on
> > powerpc.
> >
> > [  358.458385] Removing IBM Power 842 compression device
> > [  374.795734] kexec_core: Starting new kernel
> > [  374.795748] kexec: Waking offline cpu 1.
> > [  374.875695] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate
> > [  374.935833] kexec: Waking offline cpu 2.
> > [  375.015664] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate
> > snip..
> > [  375.515823] kexec: Waking offline cpu 6.
> > [  375.635667] crash hp: kexec_trylock() failed, elfcorehdr may be inaccurate
> > [  375.695836] kexec: Waking offline cpu 7.
> >
> > During kexec, the offline CPUs are brought online, which triggers the
> Is this a generic action or specific on ppc about the offline CPUs being
> brought line during kexec?

I think it is powerpc specific.
Patch that introduced this on powerpc: e8e5c2155b003 ("powerpc/kexec: 
Fix orphaned offline CPUs across kexec")

- Sourabh Jain