F25 completly froze, howto get pre-crash error messages?

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F25 completly froze, howto get pre-crash error messages?

Frédéric Bron
My F25 KDE Plasma completly froze. I even could not do Alt-SysReq
REISUB. I had to turn it off.
Is there a way to see if I can get some messages that would help me to
understand what happened?
Frédéric
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Re: F25 completly froze, howto get pre-crash error messages?

Tom Horsley-5
On Thu, 3 Aug 2017 12:39:11 +0200
Frédéric Bron wrote:

> My F25 KDE Plasma completly froze. I even could not do Alt-SysReq
> REISUB. I had to turn it off.
> Is there a way to see if I can get some messages that would help me to
> understand what happened?

If you are using nvidia graphics and the nouveau driver, it could
be the same as this:

https://bugzilla.redhat.com/show_bug.cgi?id=1475994

After you rebooted, journalctl should be able to show you any
logs from before the reboot if they managed to get flushed to
disk. If they didn't you probably won't be able to discover
anything.
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Re: F25 completly froze, howto get pre-crash error messages?

Frédéric Bron
> If you are using nvidia graphics and the nouveau driver, it could
> be the same as this:
> https://bugzilla.redhat.com/show_bug.cgi?id=1475994

Yes I am using nvidia with nouveau. I my case, I could not login by
ssh. The machine was unreachable.

In the journal, however, I do not see anything related to nouveau.
I can see many many many of lines such as:
kernel: usb 1-1.4: new high-speed USB device number 63 using xhci_hcd
with different numbers.
I suppose this is because I was writing a lot of data (video) to a
USB3 hard disk at that time.

Frédéric
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Re: F25 completly froze, howto get pre-crash error messages?

Sam Varshavchik
Frédéric Bron writes:

> In the journal, however, I do not see anything related to nouveau.
> I can see many many many of lines such as:
> kernel: usb 1-1.4: new high-speed USB device number 63 using xhci_hcd
> with different numbers.
> I suppose this is because I was writing a lot of data (video) to a
> USB3 hard disk at that time.

No, this only logged that a new USB device was attached to the system. Has  
nothing to do with actually writing anything.


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Re: F25 completly froze, howto get pre-crash error messages?

Garry T. Williams
In reply to this post by Frédéric Bron
On Thursday, August 3, 2017 6:39:11 AM EDT Frédéric Bron wrote:
> My F25 KDE Plasma completly froze. I even could not do Alt-SysReq
> REISUB. I had to turn it off.
> Is there a way to see if I can get some messages that would help me to
> understand what happened?

I am not using Nvidia (Intel) and I have experienced the same several
times.  Since there is nothing in the journal at the time it locks up,
I have no data about the freeze.  I also would love to know how to
obtain problem source identification data.  I first encountered this
with F25 and it seems to be much more persistent now.

The lock up occurs over night after display is turned off by the power
management stuff.

Kernel 4.11.11-300.fc26.x86_64

--
Garry T. Williams
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