Spontaneous weird reboot (with logs, surprisingly)

[tonsimple]

Qubes OS version (e.g., R3.2):

3.2

Affected TemplateVMs (e.g., fedora-23, if applicable):

dom0 (presumably)

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Expected behavior:

System on a non-overclocked and well-cooled box remains stable for >48 hours

Actual behavior:

Occasional spontaneous reboots due to unknown cause, relatively rare.

Steps to reproduce the behavior:

Unfortunately, only running qubes and waiting

General notes:

Despite the crash-like random occurrence, the reboot turns out to be "graceful" enough to leave a seemingly unambiguous log (the -- Reboot -- is present where the reboot took place).

Here it is
weirdreboot.txt

trails of asterisks a-la ** indicate either my comment added later, or redaction (I redacted some VM names ;-) )

Look for
**(****ANCHOR****comment - I didn't ask for this reboot!)**

that's exactly where the reboot takes place.

Do note that -- Reboot -- statement is preceded by a copious "normal qubes activity" log.

I can't quite determine from this log alone what caused reboot, but I'm not a professional. Hope it provides enough info to figure out what's going on.

P.S.:
I was not even working with qubes when the reboot happened, I went afk for a bit and was on the other side of the room when I suddenly heard typical "reboot noises"

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Related issues:

[andrewdavidwong]

Did you apply dom0 updates without rebooting?

[andrewdavidwong]

Did you apply dom0 updates without rebooting?

[tonsimple]

@andrewdavidwong no, I applied updates several days before, and made a planned reboot afterwards.

No updates were installed to dom0 on 31 January

[tonsimple]

@andrewdavidwong no, I applied updates several days before, and made a planned reboot afterwards.

No updates were installed to dom0 on 31 January

[0spinboson]

I'm also seeing unexpected reboots, though without any journal entries that seem relevant. First occurrence was on jan 30th, 3 so far. All occurred while I was AFK for an extended period of time.
Only recent update I've seen is the domU pulseaudio and mesa stuff, the former from current-testing, would have to check which were the latest dom0 updates.
Additional info: I'm running all current dom0 updates in current-testing and security-testing, 4.8.12 kernel (since the day Marek uploaded it in december)

[0spinboson]

I'm also seeing unexpected reboots, though without any journal entries that seem relevant. First occurrence was on jan 30th, 3 so far. All occurred while I was AFK for an extended period of time.
Only recent update I've seen is the domU pulseaudio and mesa stuff, the former from current-testing, would have to check which were the latest dom0 updates.
Additional info: I'm running all current dom0 updates in current-testing and security-testing, 4.8.12 kernel (since the day Marek uploaded it in december)