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Re: [Xen-devel] [stable-4.11] Heads-up: c719519 (x86/SMP: don't try to stop already stopped CPUs) causes 100% kexec/kdump failure
- To: "Stonehouse, Robert" <rjstone@xxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Tue, 29 Oct 2019 11:29:55 +0000
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- Cc: "Durrant, Paul" <pdurrant@xxxxxxxxxx>, "Elnikety, Eslam" <elnikety@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Tue, 29 Oct 2019 11:30:27 +0000
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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.
--
Thanks,
Sergey
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