Re: [Xen-devel] [stable-4.11] Heads-up: c719519 (x86/SMP: don't try to stop already stopped CPUs) causes 100% kexec/kdump failure

[Jan Beulich <jbeulich@xxxxxxxx>]

On 29.10.2019 12:29, Sergey Dyasli wrote:
> On 28/10/2019 17:30, Stonehouse, Robert wrote:
>> This is a heads-up as I have observed that the following commit (backported 
>> onto an Amazon 4.11 tree) causes kexec (and hence kdump) to fail. 
>> ========
>> commit c719519a4183d0630121f6abeba420f49dbc3229
>> Author: Jan Beulich <jbeulich@xxxxxxxx>
>> AuthorDate: Fri Jul 5 10:32:41 2019 +0200
>> Commit: Jan Beulich <jbeulich@xxxxxxxx>
>> CommitDate: Fri Jul 5 10:32:41 2019 +0200
>>
>> x86/SMP: don't try to stop already stopped CPUs
>>     
>>     In particular with an enabled IOMMU (but not really limited to this
>>     case), trying to invoke fixup_irqs() after having already done
>>     disable_IO_APIC() -> clear_IO_APIC() is a rather bad idea:
>> ========
> 
> This was already fixed in staging by "x86/crash: fix kexec transition 
> breakage":
> 
>       
> https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=f56813f3470c5b4987963c3c41e4fe16b95c5a3f
> 
> Looks like it needs inclusion into 4.11 branch.

Hmm, in principle I did fish out this one and a few more for
backporting. But it looks like I've applied them to the 4.12
branch only. Thanks for noticing!

Jan

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