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[Bug 1401716] Re: segfault when trying to play a video after suspend

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sat, 13 Dec 2014 10:47:41 -0000
Reply-to: Bug 1401716 <1401716@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
mathew thomas, thank you for reporting this and helping make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1401716
When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

** Package changed: xserver-xorg-video-nouveau (Ubuntu) => linux
(Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1401716

Title:
  segfault when trying to play a video after suspend

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  after returning from suspend i try to play a video  (tried varoius players) and i get a crash
  Dec 12 11:01:28 lap002 kernel: [124707.154880] multiqueue0:src[14358]: segfault at 12de ip b2c23d04 sp b20fea60 error 6 in libgstlibav.so[b2c0b000+37000]
  Dec 12 11:03:33 lap002 kernel: [124832.372175] nouveau E[Xorg[2300]] failed to idle channel 0xcccc0000 [Xorg[2300]]
  Dec 12 11:03:33 lap002 kernel: [124832.372380] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002001e020 on channel 0x0003fb24 [unknown] SEMAPHORE_BG/PFIFO_READ/00 reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.372869] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF NOTIFY
  Dec 12 11:03:33 lap002 kernel: [124832.372983] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00304041 00004360 00000000 06000432
  Dec 12 11:03:33 lap002 kernel: [124832.373051] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.374797] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x023c data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.376610] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e010 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_NOTIFY reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.378539] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.380381] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320151 00000100 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.382185] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.383966] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.385817] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e020 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.387815] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002001e024 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.389838] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF NOTIFY
  Dec 12 11:03:33 lap002 kernel: [124832.391725] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00304041 00004360 00000000 06000432
  Dec 12 11:03:33 lap002 kernel: [124832.393613] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.395447] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x023c data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.397335] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e010 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_NOTIFY reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.399322] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.401242] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320151 000005c0 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.403130] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.405016] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.406941] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e020 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.409047] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002001e024 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.411284] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF NOTIFY
  Dec 12 11:03:33 lap002 kernel: [124832.413285] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00304041 00004360 00000000 06000432
  Dec 12 11:03:33 lap002 kernel: [124832.415238] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.417180] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.419199] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e010 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_NOTIFY reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.421325] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.423348] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20e6ec80 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.425389] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.427370] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.429407] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020eba540 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.431489] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.433543] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20ebbe80 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.435594] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.437664] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.439768] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020d20000 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.441983] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.444105] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20d21980 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.446236] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.448343] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.450459] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020d6d2a0 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.452635] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.454748] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20d6ec80 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.456869] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.458940] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.461058] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020dba540 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.463208] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.465305] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20dbbe80 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.467365] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.469470] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.471571] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020f20000 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.473768] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.475842] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20f21980 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.477944] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.480002] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.482138] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020f6d2a0 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.484320] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.486408] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20f6ec80 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.488457] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.490552] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.492669] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e010 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_NOTIFY reason: PAGE_NOT_PRESENT
  Dec 12 11:03:33 lap002 kernel: [124832.494916] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF NOTIFY
  Dec 12 11:03:33 lap002 kernel: [124832.497003] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00304041 00004360 00000000 06000432
  Dec 12 11:03:33 lap002 kernel: [124832.499038] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.501088] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.503189] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0021020000 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.505407] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.507493] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 21021900 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.509541] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.511546] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.513622] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002106d2a0 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.515807] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.517916] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 2106ec00 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.519954] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.521987] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.524052] nouveau E[     PFB][0000:01:00.0] trapped read at 0x00210ba540 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.526228] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.528323] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 210bbe00 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.530368] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.532396] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.534463] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0021120000 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.536625] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.538701] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 21121900 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.540778] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.542779] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.544880] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002116d2a0 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.547060] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.549163] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 2116ec00 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.551223] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.553233] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.555315] nouveau E[     PFB][0000:01:00.0] trapped read at 0x00211ba540 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.557484] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.559584] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 211bbe00 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.561672] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.563686] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.565765] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0020b5da00 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.567941] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.570046] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320251 20b5f080 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.572092] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.574102] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x023c data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.576175] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0000000000 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ
  Dec 12 11:03:33 lap002 kernel: [124832.578342] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:33 lap002 kernel: [124832.580461] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320151 00000340 00000000 04000000
  Dec 12 11:03:33 lap002 kernel: [124832.582508] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:33 lap002 kernel: [124832.584531] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:33 lap002 kernel: [124832.586608] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e020 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.588877] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002001e024 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.591127] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF NOTIFY
  Dec 12 11:03:34 lap002 kernel: [124832.593255] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00304041 00004360 00000000 06000432
  Dec 12 11:03:34 lap002 kernel: [124832.595293] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:34 lap002 kernel: [124832.597373] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x023c data 0x00000000
  Dec 12 11:03:34 lap002 kernel: [124832.599467] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e010 on channel 0x0003fb24 [Xorg[2300]] PGRAPH/DISPATCH/M2M_NOTIFY reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.601681] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF IN
  Dec 12 11:03:34 lap002 kernel: [124832.603777] nouveau E[  PGRAPH][0000:01:00.0] TRAP_M2MF 00320151 000005c0 00000000 04000000
  Dec 12 11:03:34 lap002 kernel: [124832.605854] nouveau E[  PGRAPH][0000:01:00.0]  TRAP
  Dec 12 11:03:34 lap002 kernel: [124832.607895] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x003fb24000 Xorg[2300]] subc 0 class 0x5039 mthd 0x0328 data 0x00000000
  Dec 12 11:03:34 lap002 kernel: [124832.610001] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001e020 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.612222] nouveau E[   PFIFO][0000:01:00.0] CACHE_ERROR - ch 3 [Xorg[2300]] subc 1 mthd 0x0068 data 0x11111111
  Dec 12 11:03:34 lap002 kernel: [124832.614351] nouveau E[     PFB][0000:01:00.0] trapped read at 0x002001e024 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.616616] nouveau E[     PFB][0000:01:00.0] trapped write at 0x002001a034 on channel 0x0003fb24 [unknown] PFIFO/PFIFO_READ/SEMAPHORE reason: PAGE_NOT_PRESENT
  Dec 12 11:03:34 lap002 kernel: [124832.618680] nouveau E[  PGRAPH][0000:01:00.0] TRAP_TPDMA_2D - TP 0 - Unknown fault at address 0020328000
  Dec 12 11:03:34 lap002 kernel: [124832.620699] nouveau E[  PGRAPH][0000:01:00.0] TRAP_TPDMA_2D - TP 0 - e0c: 00000000, e18: 00000000, e1c: 00000000, e20: 00000011, e24: 0c030000
  Dec 12 11:03:34 lap002 kernel: [124832.622724] nouveau E[  PGRAPH][0000:01:00.0]  TRAP

  the only way to reset is to do a full system boot

  i am using ubuntu 14.04.1
  nouveau package version 1:1.0.10-1ubuntu2
  it shouldnt matter but i also use mateDM

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