Hi, sorry to bump the thread.

But I still with this issue on the VM. This crashes are still happening, and I 
really don’t know what to do. Since there’s nothing on logs, except from that 
message on `dmesg` of the host machine I started changing setting to see if 
anything changes or if I at least I get a pattern.

What I’ve tried:
1. Disabled I/O Threading on VM.
2. Increased I/O Threading to 2 form 1.
3. Disabled Memory Balooning.
4. Reduced VM resources form 10 CPU’s and 48GB of RAM to 6 CPU’s and 24GB of 
RAM.
5. Moved the VM to another host.
6. Dedicated a host specific to this VM.
7. Check on the storage system to see if there’s any resource starvation, but 
everything seems to be fine.
8. Checked both iSCSI switches to see if there’s something wrong with the 
fabrics: 0 errors.

I’m really running out of ideas. The VM was working normally and suddenly this 
started.

Thanks,

PS: When I was typing this message it crashed again:

[427483.126725] *** Guest State ***
[427483.127661] CR0: actual=0x0000000000050032, shadow=0x0000000000050032, 
gh_mask=fffffffffffffff7
[427483.128505] CR4: actual=0x0000000000002050, shadow=0x0000000000000000, 
gh_mask=fffffffffffff871
[427483.129342] CR3 = 0x00000001849ff002
[427483.130177] RSP = 0xffffb10186ffffb0  RIP = 0x0000000000008000
[427483.131014] RFLAGS=0x00000002         DR7 = 0x0000000000000400
[427483.131859] Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
[427483.132708] CS:   sel=0x9b00, attr=0x08093, limit=0xffffffff, 
base=0x000000007ff9b000
[427483.133559] DS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
base=0x0000000000000000
[427483.134413] SS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
base=0x0000000000000000
[427483.135237] ES:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
base=0x0000000000000000
[427483.136040] FS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
base=0x0000000000000000
[427483.136842] GS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
base=0x0000000000000000
[427483.137629] GDTR:                           limit=0x00000057, 
base=0xffffb10186eb4fb0
[427483.138409] LDTR: sel=0x0000, attr=0x10000, limit=0x000fffff, 
base=0x0000000000000000
[427483.139202] IDTR:                           limit=0x00000000, 
base=0x0000000000000000
[427483.139998] TR:   sel=0x0040, attr=0x0008b, limit=0x00000067, 
base=0xffffb10186eb3000
[427483.140816] EFER =     0x0000000000000000  PAT = 0x0007010600070106
[427483.141650] DebugCtl = 0x0000000000000000  DebugExceptions = 
0x0000000000000000
[427483.142503] Interruptibility = 00000009  ActivityState = 00000000
[427483.143353] *** Host State ***
[427483.144194] RIP = 0xffffffffc0c65024  RSP = 0xffff9253c0b9bc90
[427483.145043] CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
[427483.145903] FSBase=00007fcc13816700 GSBase=ffff925adf240000 
TRBase=ffff925adf244000
[427483.146766] GDTBase=ffff925adf24c000 IDTBase=ffffffffff528000
[427483.147630] CR0=0000000080050033 CR3=00000010597b6000 CR4=00000000001627e0
[427483.148498] Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff8f196cc0
[427483.149365] EFER = 0x0000000000000d01  PAT = 0x0007050600070106
[427483.150231] *** Control State ***
[427483.151077] PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000ceb
[427483.151942] EntryControls=0000d1ff ExitControls=002fefff
[427483.152800] ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000
[427483.153661] VMEntry: intr_info=00000000 errcode=00000006 ilen=00000000
[427483.154521] VMExit: intr_info=00000000 errcode=00000000 ilen=00000004
[427483.155376]         reason=80000021 qualification=0000000000000000
[427483.156230] IDTVectoring: info=00000000 errcode=00000000
[427483.157068] TSC Offset = 0xfffccfc261506dd9
[427483.157905] TPR Threshold = 0x0d
[427483.158728] EPT pointer = 0x00000009b437701e
[427483.159550] PLE Gap=00000080 Window=00080000
[427483.160370] Virtual processor ID = 0x0004


> On 16 Sep 2020, at 17:11, Vinícius Ferrão <fer...@versatushpc.com.br> wrote:
> 
> Hello,
> 
> I’m an Exchange Server VM that’s going down to suspend without possibility of 
> recovery. I need to click on shutdown and them power on. I can’t find 
> anything useful on the logs, except on “dmesg” of the host:
> 
> [47807.747606] *** Guest State ***
> [47807.747633] CR0: actual=0x0000000000050032, shadow=0x0000000000050032, 
> gh_mask=fffffffffffffff7
> [47807.747671] CR4: actual=0x0000000000002050, shadow=0x0000000000000000, 
> gh_mask=fffffffffffff871
> [47807.747721] CR3 = 0x00000000001ad002
> [47807.747739] RSP = 0xffffc20904fa3770  RIP = 0x0000000000008000
> [47807.747766] RFLAGS=0x00000002         DR7 = 0x0000000000000400
> [47807.747792] Sysenter RSP=0000000000000000 CS:RIP=0000:0000000000000000
> [47807.747821] CS:   sel=0x9100, attr=0x08093, limit=0xffffffff, 
> base=0x000000007ff91000
> [47807.747855] DS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
> base=0x0000000000000000
> [47807.747889] SS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
> base=0x0000000000000000
> [47807.747923] ES:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
> base=0x0000000000000000
> [47807.747957] FS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
> base=0x0000000000000000
> [47807.747991] GS:   sel=0x0000, attr=0x08093, limit=0xffffffff, 
> base=0x0000000000000000
> [47807.748025] GDTR:                           limit=0x00000057, 
> base=0xffff80817e7d5fb0
> [47807.748059] LDTR: sel=0x0000, attr=0x10000, limit=0x000fffff, 
> base=0x0000000000000000
> [47807.748093] IDTR:                           limit=0x00000000, 
> base=0x0000000000000000
> [47807.748128] TR:   sel=0x0040, attr=0x0008b, limit=0x00000067, 
> base=0xffff80817e7d4000
> [47807.748162] EFER =     0x0000000000000000  PAT = 0x0007010600070106
> [47807.748189] DebugCtl = 0x0000000000000000  DebugExceptions = 
> 0x0000000000000000
> [47807.748221] Interruptibility = 00000009  ActivityState = 00000000
> [47807.748248] *** Host State ***
> [47807.748263] RIP = 0xffffffffc0c65024  RSP = 0xffff9252bda5fc90
> [47807.748290] CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040
> [47807.748318] FSBase=00007f46d462a700 GSBase=ffff9252ffac0000 
> TRBase=ffff9252ffac4000
> [47807.748351] GDTBase=ffff9252ffacc000 IDTBase=ffffffffff528000
> [47807.748377] CR0=0000000080050033 CR3=000000105ac8c000 CR4=00000000001627e0
> [47807.748407] Sysenter RSP=0000000000000000 CS:RIP=0010:ffffffff8f196cc0
> [47807.748435] EFER = 0x0000000000000d01  PAT = 0x0007050600070106
> [47807.748461] *** Control State ***
> [47807.748478] PinBased=0000003f CPUBased=b6a1edfa SecondaryExec=00000ceb
> [47807.748507] EntryControls=0000d1ff ExitControls=002fefff
> [47807.748531] ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000
> [47807.748561] VMEntry: intr_info=00000000 errcode=00000006 ilen=00000000
> [47807.748589] VMExit: intr_info=00000000 errcode=00000000 ilen=00000001
> [47807.748618]         reason=80000021 qualification=0000000000000000
> [47807.748645] IDTVectoring: info=00000000 errcode=00000000
> [47807.748669] TSC Offset = 0xfffff9b8c8d943b6
> [47807.748699] TPR Threshold = 0x00
> [47807.748715] EPT pointer = 0x000000105cd5601e
> [47807.748735] PLE Gap=00000080 Window=00001000
> [47807.748755] Virtual processor ID = 0x0003
> 
> So something really went crazy. The VM is going down at least two times a day 
> for the last 5 days.
> 
> At first I thought it would be an hardware issue, so I restarted the VM on 
> other host, and the same thing happened.
> 
> About the VM it’s configured with 10 CPUs, 48GB of RAM running oVirt 4.3.10 
> with iSCSI storage to a FreeNAS box, where the VM disks are running; there 
> are a 300GB disc for C:\ and 2TB disk for D:\.
> 
> Any ideia on how to start troubleshooting it?
> 
> Thanks,
> 

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