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[bug #42944] TFTP: "error: timeout reading '/rhel60x64/vmlinuz'" on hype


From: Bogdan Atasiei
Subject: [bug #42944] TFTP: "error: timeout reading '/rhel60x64/vmlinuz'" on hyper-v Generation 2 VMs with UEFI and secure boot disabled
Date: Fri, 08 Aug 2014 12:09:26 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/34.0.1847.116 Chrome/34.0.1847.116 Safari/537.36

URL:
  <http://savannah.gnu.org/bugs/?42944>

                 Summary: TFTP: "error: timeout reading '/rhel60x64/vmlinuz'"
on hyper-v Generation 2 VMs with UEFI and secure boot disabled
                 Project: GNU GRUB
            Submitted by: bodo3700
            Submitted on: Fri 08 Aug 2014 12:09:24 PM GMT
                Category: Network
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

    _______________________________________________________

Details:

When downloading large files like /rhel60x64/vmlinuz, grub2 just closes the
connection at some point in the middle of the file transfer (some times
sooner, some times later):
[Source File: /rhel60x64/vmlinuz]
Opcode: Error Code (5)
Error code: Not defined (0)
Error message: closed

This was found using grub2.02~beta2 (master) at commit
0901e7855f922e770cbfeb58262cb8fded518190

The attached file was captured while running grub2> configfile /default
NOTES for the capture:
192.168.205.2  - PXE, dhcp and tftp server
192.168.205.6  - hyper-v server
192.168.205.20 - the new Generation 2 VM

How to reproduce:
Try to UEFI PXE boot a hyper-v Generation 2 VM

Note that the boot process work as expected for vmware VMs with EFI boot.

Please let me know if there is anything else I can provide for you to help
with the investigation.




    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Fri 08 Aug 2014 12:09:24 PM GMT  Name: capture2.pcapng  Size: 2MB   By:
bodo3700

<http://savannah.gnu.org/bugs/download.php?file_id=31863>
-------------------------------------------------------
Date: Fri 08 Aug 2014 12:09:24 PM GMT  Name: default  Size: 541B   By:
bodo3700

<http://savannah.gnu.org/bugs/download.php?file_id=31864>

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?42944>

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