[Nouveau] [Bug 79532] New: [NV50] errors with DMA PUSHER and idle channel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79532

          Priority: medium
            Bug ID: 79532
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NV50] errors with DMA PUSHER and idle channel
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mattia.b89 at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/nouveau
           Product: Mesa

Created attachment 100275
  --> https://bugs.freedesktop.org/attachment.cgi?id=100275&action=edit
log from dmesg

apparently starting with mesa-10.2rc4 with my 9800gt PCI-E on gnome-3.12.2

I get this errors:
[ 1340.694566] nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 2 [Xorg[630]]
get 0x0020023700 put 0x0020023710 ib_get 0x000002da ib_put 0x0000032f state
0x80000240 (err: INVALID_CMD) push 0x00406040
[ 2965.025771] nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 2 [Xorg[630]]
get 0x002003a9a8 put 0x002003aa98 ib_get 0x00000132 ib_put 0x00000183 state
0x80004610 (err: INVALID_CMD) push 0x00406040
[ 2996.725428] nouveau E[   PFIFO][0000:01:00.0] DMA_PUSHER - ch 2 [Xorg[630]]
get 0x002003e150 put 0x002003e27c ib_get 0x00000080 ib_put 0x000000d7 state
0x80000024 (err: INVALID_CMD) push 0x00406040
[ 3042.646374] nouveau E[Xorg[630]] failed to idle channel 0xcccc0000
[Xorg[630]]
[ 3057.646368] nouveau E[Xorg[630]] failed to idle channel 0xcccc0000
[Xorg[630]]

then the session "reboot" to GDM (gnome login manager)


I attach the entire dmesg log

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