[Bug 99202] New: system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[Bug 99202] New: system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

            Bug ID: 99202
           Summary: system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] -
                    MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004
                    [INVALID_VALUE] - ILLEGAL_CLASS ch 11 -
                    RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: as.newsletter-S0/GAf8tV78@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

This might be related to https://bugs.freedesktop.org/show_bug.cgi?id=93629 but
a few things are different.

The screen freezes except for that the mouse pointer can be used (click has no
effect). Apart from the magic syskeys (sync, unmount, boot) the keyboard
doesn't react.
I can not use ALT-tab to switch to another program. I can not leave the game
(fullscreen mode) by using the ingame console or using ALT-F4. The mouse
pointer is trapped on the monitor where the game runs (I have two). The sound
keeps playing and sound effects are played now and then too.
I tried to get to the terminals via CTRL-ALT-F[1-6] but nothing happens.
Switching (KDE) desktops via CTRL-ALT-[arrow-left,arrow-right] is just the
same.

So far the problem happed when I used app-emulation/wine to play a game (namely
MassEffect 2, I haven't tried others) and once when I used firefoy (maybe when
using youtube). It happens unexpectedly, at least I didn't find a pattern.
I downgraded to xf86-video-nouveau-1.0.12 - seems like it happens less often.
Once when using firefox (probably watching a video).

Dec 15 15:12:38 [kernel] [ 6197.881567] nouveau 0000:03:00.0: gr: GPC3/PROP
trap: 00000004 [] x = 1968, y = 992, format = 0, storage type = 0
[...]
Dec 18 03:20:57 [kernel] [97585.789880] nouveau 0000:03:00.0: fifo: read fault
at 0000441000 engine 00 [GR] client 10 [PD] reason 02 [PTE] on channel 11
[017e507000 MassEffect2.exe[18715]]
Dec 18 03:20:57 [kernel] [97585.789883] nouveau 0000:03:00.0: fifo: gr engine
fault on channel 11, recovering...
Dec 18 03:21:46 [kernel] [97635.048675] sysrq: SysRq : Emergency Sync
Dec 18 03:21:46 [kernel] [97635.049024] Emergency Sync complete
[...]
Dec 18 17:57:52 [kernel] [ 7553.852044] nouveau 0000:03:00.0: gr: TRAP ch 13
[017e107000 MassEffect2.exe[10678]]
Dec 18 17:57:52 [kernel] [ 7553.852056] nouveau 0000:03:00.0: gr: GPC0/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3d000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852067] nouveau 0000:03:00.0: gr: GPC1/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852078] nouveau 0000:03:00.0: gr: GPC2/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3f000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852086] nouveau 0000:03:00.0: gr: GPC2/TPC2/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3e000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852097] nouveau 0000:03:00.0: gr: GPC3/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852105] nouveau 0000:03:00.0: gr: GPC3/TPC1/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852114] nouveau 0000:03:00.0: gr: GPC3/TPC2/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852125] nouveau 0000:03:00.0: gr: GPC4/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852133] nouveau 0000:03:00.0: gr: GPC4/TPC1/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3d000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852142] nouveau 0000:03:00.0: gr: GPC4/TPC2/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 3c000d [OOR_REG]
Dec 18 17:57:52 [kernel] [ 7553.852158] nouveau 0000:03:00.0: gr: TRAP ch 13
[017e107000 MassEffect2.exe[10678]]
Dec 18 17:57:52 [kernel] [ 7553.852168] nouveau 0000:03:00.0: gr: GPC0/TPC0/MP
trap: global 00000004 [MULTIPLE_WARP_ERRORS] warp 1000d [OOR_REG]
Dec 18 17:57:57 [kernel] [ 7558.147983] nouveau 0000:03:00.0: fifo: SCHED_ERROR
0a [CTXSW_TIMEOUT]
Dec 18 17:57:57 [kernel] [ 7558.147987] nouveau 0000:03:00.0: fifo: gr engine
fault on channel 2, recovering...
Dec 18 17:59:01 [CROND] (root) CMD (rm -f /var/spool/cron/lastrun/cron.hourly)
[...]
Dec 18 20:43:22 [kernel] [ 6788.582706] nouveau 0000:03:00.0: gr: TRAP ch 12
[017e348000 MassEffect2.exe[19526]]
Dec 18 20:43:22 [kernel] [ 6788.582719] nouveau 0000:03:00.0: gr: GPC3/PROP
trap: 00000100 [RT_STORAGE_TYPE_MISMATCH] x = 48, y = 4, format = 2a, storage
type = e6
Dec 18 20:43:26 [kernel] [ 6792.878268] nouveau 0000:03:00.0: fifo: SCHED_ERROR
0a [CTXSW_TIMEOUT]
Dec 18 20:43:26 [kernel] [ 6792.878271] nouveau 0000:03:00.0: fifo: gr engine
fault on channel 2, recovering.. 
[...]
Dec 21 21:19:08 [kernel] [54341.955480] nouveau 0000:03:00.0: fifo: PBDMA0:
00040000 [PBENTRY] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0000 data
00000000
Dec 21 21:19:08 [kernel] [54341.955500] nouveau 0000:03:00.0: gr: DATA_ERROR
00000004 [INVALID_VALUE] ch 11 [017efba000 firefox[17446]] subc 0 class a197
mthd 2380 data 00000040
Dec 21 21:19:08 [kernel] [54342.174931] nouveau 0000:03:00.0: gr: TRAP ch 11
[017efba000 firefox[17446]]
Dec 21 21:19:08 [kernel] [54342.174938] nouveau 0000:03:00.0: gr: DISPATCH
80000002 [CLASS_SUBCH_MISMATCH]
Dec 21 21:19:08 [kernel] [54342.174953] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 000c data
00000000
Dec 21 21:19:08 [kernel] [54342.175025] nouveau 0000:03:00.0: fifo: PBDMA0:
02000000 [SEMAPHORE] ch 11 [017efba000 firefox[17446]] subc 0 mthd 001c data
00000000
Dec 21 21:19:08 [kernel] [54342.175084] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0030 data
43000000
Dec 21 21:19:08 [kernel] [54342.175102] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0034 data
00000000
Dec 21 21:19:08 [kernel] [54342.175121] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0038 data
3f800000
Dec 21 21:19:08 [kernel] [54342.175139] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 003c data
00000000
Dec 21 21:19:08 [kernel] [54342.175157] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0040 data
00000000
Dec 21 21:19:08 [kernel] [54342.175175] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0044 data
00000000
Dec 21 21:19:08 [kernel] [54342.175193] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0048 data
00000000
Dec 21 21:19:08 [kernel] [54342.175211] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 004c data
3f800000
Dec 21 21:19:08 [kernel] [54342.175296] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0054 data
00000000
Dec 21 21:19:08 [kernel] [54342.175323] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0058 data
00000000
Dec 21 21:19:08 [kernel] [54342.175350] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 005c data
00000000
Dec 21 21:19:08 [kernel] [54342.175376] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0060 data
3f800000
Dec 21 21:19:08 [kernel] [54342.175403] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0064 data
00000000
Dec 21 21:19:08 [kernel] [54342.175429] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0068 data
00000000
Dec 21 21:19:08 [kernel] [54342.175452] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 006c data
00000000
Dec 21 21:19:08 [kernel] [54342.175475] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0070 data
00000000
Dec 21 21:19:08 [kernel] [54342.175517] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0074 data
3f800000
Dec 21 21:19:08 [kernel] [54342.175541] nouveau 0000:03:00.0: fifo: PBDMA0:
00400000 [METHODCRC] ch 11 [017efba000 firefox[17446]] subc 0 mthd 007c data
00000000
Dec 21 21:19:08 [kernel] [54342.175563] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 0084 data
00000000
[...]
Dec 21 21:19:08 [kernel] [54342.176189] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 00f8 data
00000800
Dec 21 21:19:08 [kernel] [54342.176211] nouveau 0000:03:00.0: fifo: PBDMA0:
00200000 [METHOD] ch 11 [017efba000 firefox[17446]] subc 0 mthd 00fc data
00000000
Dec 21 21:19:08 [kernel] [54342.176229] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 0100 data 004e2000
Dec 21 21:19:08 [kernel] [54342.176244] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 0104 data 200208e3
Dec 21 21:19:08 [kernel] [54342.176258] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 0108 data 00000020
Dec 21 21:19:08 [kernel] [54342.176270] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 010c data 0000000b
Dec 21 21:19:08 [kernel] [54342.176285] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 0110 data 20030700
Dec 21 21:19:08 [kernel] [54342.176300] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 0114 data 00001010
[...]
Dec 21 21:20:09 [kernel] [54402.836602] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 2644 data ef584f57
Dec 21 21:20:09 [kernel] [54402.836618] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 2648 data 00000002
Dec 21 21:20:09 [kernel] [54402.836635] nouveau 0000:03:00.0: gr: ILLEGAL_CLASS
ch 11 [017efba000 firefox[17446]] subc 0 class 0000 mthd 264c data 00000000
Dec 21 21:21:15 [kernel] [54468.854863] sysrq: SysRq : Emergency Sync


03:00.0 VGA compatible controller: NVIDIA Corporation GK110B [GeForce GTX TITAN
Z] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: eVga.com. Corp. GK110B [GeForce GTX TITAN Z]
        Flags: bus master, fast devsel, latency 0, IRQ 34
        Memory at f8000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=128M]
        Memory at ee000000 (64-bit, prefetchable) [size=32M]
        I/O ports at cf00 [size=128]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [420] Advanced Error Reporting
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024
<?>
        Capabilities: [900] #19
        Kernel driver in use: nouveau

x11-drivers/xf86-video-nouveau
     IUSE (alle Versionen):  glamor
     Installierte Versionen: Version:   1.0.12

$> emerge --info | head -n3
Portage 2.3.3 (python 2.7.12-final-0, default/linux/amd64/13.0/desktop/plasma,
gcc-4.9.3, glibc-2.23-r3, 4.8.2-gentoo_M16 x86_64)
=================================================================
System uname:
Linux-4.8.2-gentoo_M16-x86_64-Intel-R-_Core-TM-_i7_CPU_870_@_2.93GHz-with-gentoo-2.3

$> USE="opengl"; for PKG in $(equery -q hasuse $USE); do echo $PKG: $(equery -q
uses $PKG |grep $USE); done | head -n 2
app-emulation/qemu-2.7.0-r7: +opengl
app-emulation/wine-1.9.20: +opengl

# opencl is builtin for mesa and wine
$> USE="opencl"; for PKG in $(equery -q hasuse $USE); do echo $PKG: $(equery -q
uses $PKG |grep $USE); done | head -n 2
app-emulation/wine-1.9.20: +opencl
media-libs/mesa-13.0.2: +opencl

# downgrading wine didn't help
$> eix app-emulation/wine$ | grep -i install
     installed Versions: Version:   1.9.20^t

$> eix firefox$
     installed Versions: Version:   50.1.0

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

--- Comment #1 from derrierdo-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ---
Problem still appear with my
01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev
a2)

Linux wizz 4.9.0-aufs #7 SMP Mon Jan 16 19:33:55 EST 2017 x86_64 Intel(R)
Core(TM) i3-3220 CPU @ 3.30GHz GenuineIntel GNU/Linux



2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: fifo: CACHE_ERROR
- ch 17 [dolphin[5746]] subc 3 mthd 01d0 data beef0201
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: fifo: CACHE_ERROR
- ch 17 [dolphin[5746]] subc 3 mthd 01d4 data beef0201
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: fifo: CACHE_ERROR
- ch 17 [dolphin[5746]] subc 3 mthd 01d8 data beef0201
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: fifo: CACHE_ERROR
- ch 17 [dolphin[5746]] subc 3 mthd 01dc data beef0201
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: gr: TRAP_CCACHE
00000001 [FAULT]
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: gr: TRAP_CCACHE
000e0080 00000000 00000000 00000000 00000000 00000004 00000000
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: gr: 00200000 [] ch
17 [003ea0f000 dolphin[5746]] subc 3 class 8597 mthd 13bc data 00000054
2017-02-18T14:17:30-05:00 wizz kernel: nouveau 0000:01:00.0: fb: trapped read
at 002027ff00 on channel 17 [3ea0f000 dolphin[5746]] engine 00 [PGRAPH] client
05 [CCACHE] subclient 00 [CB] reason 00000006 [NULL_DMAOBJ]

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

--- Comment #2 from Jeff <jeff-p6X7lc9ZsvHQT0dZR+AlfA@public.gmane.org> ---
I am seeing the _exact_ same issue (quoted below), as described by in the
original message. Same symptoms and error messages.

"The screen freezes except for that the mouse pointer can be used (click has no
effect). Apart from the magic syskeys (sync, unmount, boot) the keyboard
doesn't react. I can not use ALT-tab to switch to another program. I can not
leave the game (fullscreen mode) by using the ingame console or using ALT-F4.
The mouse pointer is trapped on the monitor where the game runs (I have two).
The sound keeps playing and sound effects are played now and then too. I tried
to get to the terminals via CTRL-ALT-F[1-6] but nothing happens. Switching
(KDE) desktops via CTRL-ALT-[arrow-left,arrow-right] is just the same."

I am running Ubuntu 16.10 on a Dell Precision Tower 5810.

Jul  6 10:54:38 nachos gcr-prompter[22026]: GtkDialog mapped without a
transient parent. This is discouraged.
Jul  6 10:58:31 nachos kernel: [82204.289470] nouveau 0000:03:00.0: fifo:
SCHED_ERROR 0a [CTXSW_TIMEOUT]
Jul  6 10:58:31 nachos kernel: [82204.289480] nouveau 0000:03:00.0: fifo: gr
engine fault on channel 5, recovering...

03:00.0 VGA compatible controller: NVIDIA Corporation GK107 [NVS 510] (rev a1)
(prog-if 00 [VGA controller])
        Subsystem: NVIDIA Corporation GK107 [NVS 510]
        Physical Slot: 2
        Flags: bus master, fast devsel, latency 0, IRQ 30
        Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f0000000 (64-bit, prefetchable) [size=32M]
        I/O ports at e000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nouveau
        Kernel modules: nvidiafb, nouveau

Linux nachos 4.8.0-58-generic #63-Ubuntu SMP Mon Jun 26 17:08:21 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

--- Comment #3 from as.newsletter-S0/GAf8tV78@public.gmane.org ---
On one occasion I was able to kill xorg (?). The effect was that the session
was over but I could log in and start working - no reboot!
Can you try using ALT+print+k ? It took quite a while until the login screen
was available, maybe five minutes. 
Anyhow that works *sometimes* and often it does not.

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

--- Comment #4 from Artem S. Tashkinov <t.artem-VInPYn6yXxRWk0Htik3J/w@public.gmane.org> ---
Probably related bug 105884

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

--- Comment #5 from kenorb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ---
Related bug: #107829
Related post: https://askubuntu.com/q/1046945/78223

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[Bug 99202] system freeze - fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT] - MULTIPLE_WARP_ERRORS - DATA_ERROR 00000004 [INVALID_VALUE] - ILLEGAL_CLASS ch 11 - RT_STORAGE_TYPE_MISMATCH - CLASS_SUBCH_MISMATCH

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99202

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #6 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
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This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
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https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/312.

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