Re: [PATCH 5.15.y 0/2] fix softlockups in stage2_apply_range()

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On Tue, Mar 05, 2024 at 11:41:38AM -0800, Krister Johansen wrote:
> Hi Stable Team,
> In 5.15, unmapping large kvm vms on arm64 can generate softlockups.  My team has
> been hitting this when tearing down VMs > 100Gb in size.
> 
> Oliver fixed this with the attached patches.  They've been in mainline since
> 6.1.
> 
> I tested on 5.15.150 with these patches applied. When they're present,
> both the dirty_log_perf_test detailed in the second patch, and
> kvm_page_table_test no longer generate softlockups when unmapping VMs
> with large memory configurations.
> 
> Would you please consider these patches for inclusion in an upcoming 5.15
> release?

Backport looks fine, and I have no issues with this going to stable if
it helps folks.

Acked-by: Oliver Upton <oliver.upton@xxxxxxxxx>

-- 
Thanks,
Oliver




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