On Tue, Apr 04, 2023 at 12:00:45PM -0400, [email protected] wrote: > Send Grub-devel mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.gnu.org/mailman/listinfo/grub-devel > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Grub-devel digest..." > > > Today's Topics: > > 1. IPV4 UEFI grub2 PXE boot, network unavailable immediately > after grub starts ([email protected]) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 4 Apr 2023 17:56:09 +0200 > From: [email protected] > To: [email protected], [email protected] > Subject: IPV4 UEFI grub2 PXE boot, network unavailable immediately > after grub starts > Message-ID: <[email protected]> > 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 > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Grub-devel mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/grub-devel > > > ------------------------------ > > End of Grub-devel Digest, Vol 230, Issue 4 > ****************************************** _______________________________________________ Grub-devel mailing list [email protected] https://lists.gnu.org/mailman/listinfo/grub-devel
