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Date: Tue, 11 Jun 2019 18:24:28 +0800 From: Baoquan He <bhe@...hat.com> To: lijiang <lijiang@...hat.com> Cc: "Lendacky, Thomas" <Thomas.Lendacky@....com>, "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>, "x86@...nel.org" <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: The current SME implementation fails kexec/kdump kernel booting. Hi Tom, On 06/11/19 at 05:52pm, lijiang wrote: > After applied Tom's patch, i changed the reserved memory(for crash kernel) to the > above 256M(>256M), such as crashkernel=320M or 384M,512M..., the kdump kernel can > work and successfully dump the vmcore. > > But the kdump kernel always happened the panic or could not boot successfully in > the 256M(<= 256M) case, and on HP machine, i noticed that it printed OOM, the kdump > kernel was too smaller memory. But i never see the OOM on speedway machine(probably > related to the earlyprintk, it doesn't work and it loses many logs). > > After removing the option 'CONFIG_DEBUG_INFO' from .config, i tested again, the kdump > kernel did not happen the panic in the 256M(crashkernel=256M), the kdump kernel can > work and succeed to dump the vmcore on HP machine or speedway machine. > > It seems that the small memory caused the previous failure in kdump kernel. I would > suggest to post this patch to upstream. What's your opinion? Tom, Baoquan and other > people. Or do you have any comment? As Lianbo said at above, the previous failure in kdump kernel is caused by OOM. Just the log on speedway is incomplete, I am not sure what happened. Now after investigation, your patch works to fix the issue. Could you post it for riviewing? Thanks Baoquan
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