Messages in this thread | | | From | Dexuan Cui <> | Subject | RE: PCI: Race condition in pci_create_sysfs_dev_files | Date | Thu, 18 Nov 2021 03:42:26 +0000 |
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> From: Krzysztof Wilczyński <kw@linux.com> > Sent: Wednesday, November 17, 2021 7:10 PM > [...] > > I think we're seeing the same issue with a Linux VM on Hyper-V. > > Are you still seeing this issue happen? If so, does it happen often?
This doesn't happen often. It's found by our test team.
> We haven't had a report from a system that runs as a hypervisor guest > before. I also assume this is x86 or x86_64 platform, correct?
Yes, x86_64.
> > Here the kernel is ... > > > This is quite an old kernel, however the 5.4 is a long-term kernel, and > therefore we need to make sure that it would also work properly. > > > > '/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/475 > 05500-0003-0000-3130-444531334632/pci0003:00/0003:00:00.0/config' > > Following the commit e1d3f3268b0e ("PCI/sysfs: Convert "config" to static > attribute"), the issue particularly with the "config" attribute should be > resolved, thus more modern kernel versions are no long suffer from the race > condition related to this specific and some other problematic attributes.
Thanks for sharing the commit info! It's great to know this has been fixed in the mainlinekernel.
> We quite likely have to back-port these changes to a number of older > long-term kernels. I am going to look into it.
Sounds good! Thank you, Krzysztof!
> Hopefully, once the patches land in upstream long-term kernels, then > distributions would be able to cherry-pick them and apply to their kernels > releases. > > Krzysztof
Yes, this should work.
Thanks, -- Dexuan
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