[Nouveau] [Bug 99396] Crash in nouveau_dri.so when switching apps with alt-tab in Gnome

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99396

--- Comment #5 from Per Arnold Blaasmo <per.arnold at blaasmo.no> ---
I seem to experience the same problem.
I am using Fedora 25.
gnome-shell-3.22.2-2.fc25.x86_64
kernel-4.9.5-200.fc25.x86_64
xorg-x11-drv-nouveau-1.0.13-1.fc25.x86_64
mesa 13.0.3-1.fc25.x86_64

Not sure if it is related, but in the system log I get:

jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: fail ttm_validate
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validating bo list
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validate: -12
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: fail ttm_validate
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validating bo list
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validate: -12
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: fail ttm_validate
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validating bo list
jan. 30 08:45:43 nordt0206.corp.atmel.com kernel: nouveau 0000:02:00.0:
gnome-shell[18725]: validate: -12

...

jan. 30 08:46:21 nordt0206.corp.atmel.com org.gnome.Shell.desktop[18725]:
nouveau: kernel rejected pushbuf: Cannot allocate memory
jan. 30 08:46:21 nordt0206.corp.atmel.com org.gnome.Shell.desktop[18725]:
nouveau: ch2: krec 0 pushes 1 bufs 54 relocs 0
jan. 30 08:46:21 nordt0206.corp.atmel.com org.gnome.Shell.desktop[18725]:
nouveau: ch2: buf 00000000 00000002 00000004 00000004 00000000
jan. 30 08:46:21 nordt0206.corp.atmel.com org.gnome.Shell.desktop[18725]:
nouveau: ch2: buf 00000001 00000006 00000004 00000000 00000004
jan. 30 08:46:21 nordt0206.corp.atmel.com org.gnome.Shell.desktop[18725]:
nouveau: ch2: buf 00000002 00000077 00000004 00000004 00000000
....

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