[Bug 100567] Nouveau system freeze fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 100567] Nouveau system freeze fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]
Date: Thu, 05 Sep 2019 14:48:03 +0000	[thread overview]
Message-ID: <bug-100567-8800-qwAnE5mKda@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-100567-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=100567

John Walicki <walicki-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org> changed:

           What    |Removed                     |Added
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                 CC|                            |walicki-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org

--- Comment #38 from John Walicki <walicki-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org> ---
The nouveau driver on my ThinkPad P50 (running RHEL 7.7 with a
5.2.11-1.el7.elrepo.x86_64 kernel) just hung up with this same error.

Sep  5 09:04:48 jaw-p50rhel7 kernel: nouveau 0000:01:00.0: fifo: SCHED_ERROR 0a
[CTXSW_TIMEOUT]
Sep  5 09:04:48 jaw-p50rhel7 kernel: nouveau 0000:01:00.0: fifo: runlist 0:
scheduled for recovery
Sep  5 09:04:48 jaw-p50rhel7 kernel: nouveau 0000:01:00.0: fifo: channel 2:
killed
Sep  5 09:04:48 jaw-p50rhel7 kernel: nouveau 0000:01:00.0: fifo: engine 0:
scheduled for recovery
Sep  5 09:04:48 jaw-p50rhel7 kernel: nouveau 0000:01:00.0: X[5775]: channel 2
killed!

What is possibly interesting is that in /var/log/Xorg.0.log
there was a mouse event that matches exactly with the timing of the nouveau
errors.

[150241.393] AUDIT: Thu Sep  5 09:04:19 2019: 5775: client 43 disconnected
[150241.396] AUDIT: Thu Sep  5 09:04:19 2019: 5775: client 44 disconnected
[150270.473] (II) event8  - Logitech USB Receiver: SYN_DROPPED event - some
input events have been lost.

The [bracket] is a timestamp which indicates the time since the system last
booted, in seconds. So 150270 is 29 seconds after the 09:04:19 timestamped
line. 
09:04:19 + 29 seconds is 09:04:48
The nouveau driver hung at that time (see /var/log/messages timestamp above)
Not certain if that was cause or effect of the video driver hang.

I was able to ssh into my system to reboot.

$ lspci -vv -s 01:00.0
01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M1000M]
(rev a2) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 2230
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 129
        Region 0: Memory at b2000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at a0000000 (64-bit, prefetchable) [size=256M]
        Region 3: Memory at b0000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at 4000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

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