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  • All news regarding Xen and XCP-ng ecosystem

    146 Topics
    5k Posts
    J
    @acebmxer Can you suspend the vm ? If its not possible its most likely a kernel thing inside the vm. If you can suspend the vm however, it points more to a timing/timeout issue with the migration.

  • Everything related to the virtualization platform

    1k Topics
    15k Posts
    H
    Hi all, We have a production Windows Server 2012 R2 VM (SQL Server) that has crashed three times with the same bugcheck in xenvbd.sys. Looking for advice and for a safe download of the last 2012 R2-compatible tools. Environment XCP-ng 7.6.0 (yes, we know it's EOL; [OPTIONAL - keep or delete: a host refresh/upgrade is already being planned]. Right now we need a stopgap for this VM.) Storage: LVM over FC (HPE MSA 1040), multipath VM: Windows Server 2012 R2 (build 9600.18505), 8 vCPU, 64 GB RAM (static, dynamic min = max) PV drivers: Citrix xenvbd.sys 8.1.0.130 (old Citrix tools) Crashes (identical each time) 2026-06-17, 2026-09-01, 2026-10-08 BUGCHECK 0xD1 DRIVER_IRQL_NOT_LESS_OR_EQUAL (0x18, 0x2, 0x1, xenvbd+0x8795) Write to NULL+0x18: lock xadd dword ptr [rcx+18h],eax with rcx = 0 Stack (from MEMORY.DMP): nt!KiRetireDpcList -> nt!KiExecuteAllDpcs -> xenvbd+0xf464 -> xenvbd+0x6f55 -> xenvbd+0xfecb -> xenvbd+0x8795 i.e. crash in a DPC, apparently in the I/O completion path. Context The VM ran with 16 GB RAM from 2023-09 to 2026-02 with zero crashes (no restarts at all in ~29 months). On 2026-02-06 RAM was raised to 64 GB (SQL max server memory 14 GB -> 48 GB). First crash 4 months later; intervals between crashes so far: 131, 76, 37 days. Host logs at the time of the last crash: no FC/SCSI/multipath errors. The only event on this VM's VDIs was one SMGC coalesce with a clean tapdisk pause/unpause about 12 minutes before the crash. Questions Is this a known xenvbd bug fixed in later versions (e.g. the 9.2.1 fix "A storage error can cause Windows VMs to crash", or the grant table exhaustion fix in 9.3.1)? A reply in the XSA-468 thread pointed to XenServer VM Tools 9.2.3 as the last version supporting 2012/2012 R2. Where can it be downloaded from an official source? downloads.xenserver.com only offers 9.6.0, and the same URL pattern for 9.2.3 returns 404. Could the RAM increase (16 -> 64 GB) plausibly trigger this with old xenvbd (grant tables, larger I/O)? Is there a workaround that doesn't require a driver update (e.g. a host-side setting)? We know 2012 R2 is EOL; we are looking for a safe stopgap. Thanks!

  • All Xen Orchestra related questions/reports

    3k Topics
    29k Posts
    poddingueP
    Thanks for coming back with that. Commit 8c2f3 is PR #10518 (https://github.com/vatesfr/xen-orchestra/pull/10518), and the changelog lists it under XO 6.9.1 from 5 October, so XOA users get it with 6.9.1, on the latest channel for now if I read the release channels right.

  • Our hyperconverged storage solution

    54 Topics
    824 Posts
    J
    @poddingue Turns out it is all secondary-to-secondary out of sync. So that makes it less intense, though if primary dies I wonder how it will resolve this, or if it will become split brained. Still unsure of how it happened, but the ones I manually cleaned up have not come back. Going to continue to manually clear them up. If it happens again I will have an alert setup to notify me, and I have all the xcp-ng logs and everything to be able to see what happened. If that happens I will post here with details and logs for the resource so we can see how it occurs. [image: image.jpeg]

  • Non-English speakers

    37 Topics
    136 Posts
    J
    @AtaxyaNetwork Merci pour tes recherches ! Oui "cd_label" serait cool comme ajout au plugin ce qui permet sur les distro type Fedora/Redhat de ne pas avoir de boot_command à gérer