Re: general protection fault on vif50.1-q1-guest

[John Naggets <hostingnuggets@xxxxxxxxx>]

Here would be the kernel log:

May  6 15:22:04 server kernel: [20553234.022182] general protection
fault: 0000 [#1] SMP
May  6 15:22:04 server kernel: [20553234.126246] CPU: 0 PID: 8305
Comm: vif50.1-q1-gues Tainted: P           O  3.16.0-10-amd64 #1
Debian 3.16.72-1
May  6 15:22:04 server kernel: [20553234.137328] Hardware name: Quanta
Computer Inc QuantaPlex T41S-2U/S2S-MB, BIOS S2S_3B12 05/30/2019
May  6 15:22:04 server kernel: [20553234.147371] task:
ffff88003c9f95d0 ti: ffff88004a3ac000 task.ti: ffff88004a3ac000
May  6 15:22:04 server kernel: [20553234.155951] RIP:
e030:[<ffffffffa08fcaa2>]  [<ffffffffa08fcaa2>]
xenvif_gop_frag_copy+0x22/0x3b0 [xen_netback]
May  6 15:22:04 server kernel: [20553234.167089] RSP:
e02b:ffff88004a3afd98  EFLAGS: 00010282
May  6 15:22:04 server kernel: [20553234.173501] RAX: 0000000000001000
RBX: ffff8802e0841800 RCX: 7aec7d18f3f45689
May  6 15:22:04 server kernel: [20553234.181771] RDX: ffff88004a3afe80
RSI: ffff8802e0841800 RDI: 0000000111f703b7
May  6 15:22:04 server kernel: [20553234.189991] RBP: ffffc9002332c258
R08: 000000005ff8d9a9 R09: 00000000b1fe2a0e
May  6 15:22:04 server kernel: [20553234.198209] R10: ffff880000000000
R11: 0000000000000002 R12: 7aec7d18f3f45689
May  6 15:22:04 server kernel: [20553234.206413] R13: ffffc9002332c258
R14: ffff88004a3afe54 R15: 0000000000000001
May  6 15:22:04 server kernel: [20553234.214628] FS:
0000000000000000(0000) GS:ffff880484000000(0000)
knlGS:ffff880484000000
May  6 15:22:04 server kernel: [20553234.223800] CS:  e033 DS: 0000
ES: 0000 CR0: 0000000080050033
May  6 15:22:04 server kernel: [20553234.230619] CR2: 00007f49c8679000
CR3: 0000000074855000 CR4: 0000000000042660
May  6 15:22:04 server kernel: [20553234.238829] Stack:
May  6 15:22:04 server kernel: [20553234.241914]  0000000058f6d400
ffffc90023336c08 00000000000002c0 ffff8802e0841800
May  6 15:22:04 server kernel: [20553234.250476]  ffff88004a3afe80
0000000000000080 ffff8802e0841800 ffffc9002332c258
May  6 15:22:04 server kernel: [20553234.259046]  79eb3472cad61644
0000000000000028 ffff88004a3afe54 0000000000000001
May  6 15:22:04 server kernel: [20553234.267615] Call Trace:
May  6 15:22:04 server kernel: [20553234.271146]  [<ffffffffa08ff2c9>]
? xenvif_kthread_guest_rx+0x549/0xce0 [xen_netback]
May  6 15:22:04 server kernel: [20553234.280122]  [<ffffffffa08fed80>]
? xenvif_map_frontend_rings+0xd0/0xd0 [xen_netback]
May  6 15:22:04 server kernel: [20553234.289052]  [<ffffffff810905d1>]
? kthread+0xd1/0xf0
May  6 15:22:04 server kernel: [20553234.295279]  [<ffffffff8153be8f>]
? __schedule+0x22f/0x750
May  6 15:22:04 server kernel: [20553234.301822]  [<ffffffff81090500>]
? kthread_create_on_node+0x1b0/0x1b0
May  6 15:22:04 server kernel: [20553234.309413]  [<ffffffff8154030e>]
? ret_from_fork+0x6e/0xa0
May  6 15:22:04 server kernel: [20553234.316051]  [<ffffffff81090500>]
? kthread_create_on_node+0x1b0/0x1b0
May  6 15:22:04 server kernel: [20553234.323643] Code: 2e 0f 1f 84 00
00 00 00 00 0f 1f 44 00 00 41 57 41 56 b8 00 10 00 00 41 55 41 54 49
89 cc 55 53 49 89 fd 4b 8d 3c 08 48 83 ec 30 <48> 8b 09 4c 8b 74 24 68
4
c 8b 7c 24 70 80 e5 40 74 08 49 8b 4c
May  6 15:22:04 server kernel: [20553234.345693] RIP
[<ffffffffa08fcaa2>] xenvif_gop_frag_copy+0x22/0x3b0 [xen_netback]
May  6 15:22:04 server kernel: [20553234.354480]  RSP <ffff88004a3afd98>
May  6 15:22:35 server kernel: [20553265.003074] ---[ end trace
4fb039a0de2de66f ]---

On Fri, May 8, 2020 at 9:15 AM John Naggets <hostingnuggets@xxxxxxxxx> wrote:
>
> Hello,
>
> I had recently a general protection fault on a Debian 8 server with
> Xen (debian pacakge: 4.4.4lts4-0+deb8u1) and it looks like it was Xen
> related because it showed the vif50.1-q1-guest kernel process in the
> kernel log. I have copied the kernel log below in this mail for
> reference. After this GPF the system was still responding but one domU
> lost network connectivity and all the others where still working
> properly. I decided to power-off and power-on the system as a soft GPF
> renders the system in an unstable state.
>
> Now I am trying to find out what is most likely the cause of this
> general protection fault in order to avoid that again in the future
> and would like your opinion on that:
>
> - is this maybe a bug in Xen?
> - a bug in the kernel used by Debian?
> - a hardware issue?
> - if it is a hardware issue, what is most likely? RAM? CPU?
> - anything else I am missing?
>
> Note that the hardware is enterprise grade hardware and that the BIOS
> has been updated to the latest available version.The CPUs (dual CPU)
> are Intel Xeon E5-2640 v3 @ 2.60GHz.
>
> Thank you for your input.
>
> Best regards,
> John