User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:41.0) Gecko/20100101
Firefox/41.0 SeaMonkey/2.38 Lightning/4.3b2
Build Identifier: 

Last tumbleweed version:
I'm using the nouveau driver with the kernel 4.3.0-1-xen (geeko@buildhost) (gcc
version 5.2.1 20151008 [gcc-5-branch revision 228597.

My hardware is a HP proliant ML350p Gen8 with an Nvidia quadro 4000 video card
with  2 screens (DVI + DP1) using a extended layout; 

I have some locks occurring randomly when 
- loading some programs (Yast, Xine; Shishen etc...)
- or starting a video in the browser (seamonkey  on www. youtube or news site
5www.lesoir;eb, www.lemonde.fr and starting a video)
- reactivating a session (lock occurs when moving mouse or pressing keyboard)

the desktop freezes or is bad redraw and locks thereafter.Keyboard is inactive
and I must do a hard reset.
Some time the hardware indicate a non maskable interrupt
This lock occurs randomly since kernel 4.2


In journalctl I see a crash of the nouveau driver.

Here the output when locking by loading Yast:
Nov 15 10:36:29 hpprol2 audit[25865]: USER_START pid=25865 uid=1000 auid=1000
ses=3 msg='op=PAM:session_open
grantors=pam_limits,pam_unix,pam_umask,pam_systemd,pam_gnome_keyring,pam_env,pam_xauth
acct="root" 
Nov 15 10:36:29 hpprol2 kernel: nouveau 0000:0a:00.0: fifo: PBDMA0: 80000000 []
ch 30 [007e6ab000 y2controlcenter[25892]] subc 0 mthd 0000 data 00000000
Nov 15 10:36:29 hpprol2 kernel: nouveau 0000:0a:00.0: fifo: PBDMA0: 80040000 []
ch 30 [007e6ab000 y2controlcenter[25892]] subc 0 mthd 0000 data 00000000
Nov 15 10:36:29 hpprol2 kernel: nouveau 0000:0a:00.0: fifo: PBDMA0: 80000000 []
ch 30 [007e6ab000 y2controlcenter[25892]] subc 0 mthd 0000 data 00000000
Nov 15 10:36:29 hpprol2 kernel: nouveau 0000:0a:00.0: fifo: read fault at
0000000000 engine 07 [PFIFO] client 06 [PFIFO] reason 00 [PT_NOT_PRESENT] on
channel 30 [007e6ab000 y2controlcenter[25892]]
Nov 15 10:36:29 hpprol2 kernel: nouveau 0000:0a:00.0: fifo: fifo engine fault
on channel 30, recovering...
Nov 15 10:36:37 hpprol2 kernel: nouveau 0000:0a:00.0: DRM: GPU lockup -
switching to software fbcon

I'll attach a long extract of journalctl after a lock occuring when
reactivating a session

Regards
Philippe 

Reproducible: Sometimes

Steps to Reproduce:
1.randomly moving windows from screen 1 to screen 2
2.randomly loading a program (Yast, xine)
3.randomly reactivating a session
Actual Results:  
System is locked: hard reset needed

Expected Results:  
Nouveau should not crash