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UEFI IPV4 PXE Boot Issue.


From: Mukesh Kumar Chaurasiya
Subject: UEFI IPV4 PXE Boot Issue.
Date: Wed, 5 Apr 2023 11:08:45 +0530

On Tue, Apr 04, 2023 at 12:00:45PM -0400, grub-devel-request@gnu.org wrote:
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> Today's Topics:
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>    1. IPV4 UEFI grub2 PXE boot, network unavailable immediately
>       after grub starts (alexander.burmashev@oracle.com)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 4 Apr 2023 17:56:09 +0200
> From: alexander.burmashev@oracle.com
> To: grub-devel@gnu.org, daniel.kiper@oracle.com
> Subject: IPV4 UEFI grub2 PXE boot, network unavailable immediately
>       after grub starts
> Message-ID: <ce9eeca8-98c2-e7f4-d4c6-3240ab0530fe@oracle.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> Hello!
> Per Daniel's suggestion reaching grub-devel, since people might be 
> already working on this.
> For reference: https://savannah.gnu.org/bugs/?63245
> 
> 
> TLDR: during UEFI PXE boot + IPv4 grub drops to cmdline, unable to get 
> grub config, network is not available. We have a huge fleet of machines, 
> and with latest 2.06 we are regularly hitting this bug during PXE boot. 
> https://savannah.gnu.org/bugs/?63245
> I am wondering if someone else is hitting this issue as well and have 
> some ideas/WIP to share.
> 
> It is indeed random, it could be 1 boot out of 1000, or 5 boots in a 
> row. Nature of the bug makes it hard to debug.
> 
> There are multiple machines with identical hardware provisioned at the 
> same time, and it is absolutely random which will be hit by this bug. If 
> you reboot the affected box, most likely it will come back just fine and 
> with no issue.
> 
> i was not able to catch any abnormal traffic before it happens via 
> tcpdump, nothing suspicious in tftp log, though i might have not been 
> trying/checking hard enough. According to grub variables everything is 
> setup correctly, so there is no issue with dhcp traffic ?
> 
> The exact loop grub2 is entering is permacycling over 
> https://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/net/drivers/efi/efinet.c#n68
> 
> i was able to reproduce the issue both with RHEL 8 ( rhel-8.7.0 ) grub2 
> patchset and with latest upstream grub2.
> 
> bug filer for https://savannah.gnu.org/bugs/?63245 mentioned in his 
> thread with intel that he was hitting that with one the latest canonical 
> grubs.
> 
Power Arch is facing something similar, not exactly sure if this is same.
A patchset is there to fix this on power arch. you can try something similar
for x86
https://lists.gnu.org/archive/html/grub-devel/2023-03/msg00119.html

Regards,
Mukesh
> 
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> End of Grub-devel Digest, Vol 230, Issue 4
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