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NirSchwartz
Contributor
Contributor

ESXi 6.5a VM panic crash VMware ESX unrecoverable error: (vcpu-7) MXUserAllocSerialNumber: too many locks!

Hi,

Yesterday without any warning one of our VMs crashed unexpectedly.

In the Windows event log there is nothing (only the system shutdown was unexpected).

In the vcenter the error is: Error message from vmhost: VMware ESX unrecoverable error: (vcpu-7) MXUserAllocSerialNumber: too many locks!

In the vmware-12.log I found this:

2017-05-03T07:48:00.237Z| vcpu-7| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.237Z| vcpu-7| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.266Z| vcpu-5| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.266Z| vcpu-5| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.310Z| vcpu-4| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.310Z| vcpu-4| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.375Z| vcpu-6| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.375Z| vcpu-6| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.376Z| vcpu-4| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.376Z| vcpu-4| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.468Z| vcpu-6| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.468Z| vcpu-6| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.643Z| vcpu-7| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.643Z| vcpu-7| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.697Z| vcpu-2| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.697Z| vcpu-2| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.950Z| vcpu-5| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:00.950Z| vcpu-5| I125: GuestMsg: Too many channels opened.

2017-05-03T07:48:26.721Z| vcpu-3| I125: GuestMsg: channel 3: wrong cookie, discarding message.

2017-05-03T07:48:26.721Z| vcpu-3| I125: GuestMsg: channel 3: wrong cookie, discarding message.

2017-05-03T08:01:54.819Z| vmx| I125: GuestRpcSendTimedOut: message to toolbox-dnd timed out.

2017-05-03T08:06:16.394Z| vmx| I125: Guest: toolbox-dnd: Version: build-4449150

2017-05-03T08:07:26.721Z| vcpu-7| I125: GuestMsg: channel 2: wrong cookie, discarding message.

2017-05-03T08:07:26.721Z| vcpu-7| I125: GuestMsg: channel 2: wrong cookie, discarding message.

2017-05-03T08:08:27.016Z| vmx| I125: Guest: toolbox-dnd: Version: build-4449150

2017-05-03T08:09:52.647Z| vmx| I125: Guest: toolbox-dnd: Version: build-4449150

2017-05-03T08:11:05.321Z| vmx| I125: Guest: toolbox-dnd: Version: build-4449150

2017-05-03T08:11:06.852Z| vcpu-7| E105: PANIC: MXUserAllocSerialNumber: too many locks!

This is a production environment and I appreciate any suggestion.

Thanks,

Nir

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4 Replies
dariusd
VMware Employee
VMware Employee

Welcome to the VMware Communities!

If this is a Terminal Services VM with multiple users logged in concurrently, the issue you are encountering is that described in this VMware KB article: VMs PANIC: MXUserAllocSerialNumber: too many locks (2149941)

There is a workaround given in that article, and a fix is queued for upcoming update releases of ESXi 6.5.

Thanks,

--

Darius

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whysyn42
Contributor
Contributor

Are there any updates on this issue?  The linked KB article appears to be unavailable at this time and we're hitting this same error.

Thanks!

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Eloy_H3
Contributor
Contributor

I am experiencing this issue now as well. Has there been any update on this issue?

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dariusd
VMware Employee
VMware Employee

From the KB article I quoted earlier:

For 6.0

This issue is resolved in ESXi 6.0 Patch Release ESXi600-201706001, available at VMware Patch Downloads. For more information on downloading patch, see How to download patches in MyVMware (1021623).

For 6.5

  This issue is resolved in ESXI 6.5 Update 1, available at VMware Downloads​.

Have you upgraded to a version of ESXi which is not affected by this defect?

--

Darius

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