2012/5/24 Chris Wilson <chris at chris-wilson.co.uk>: > On Thu, 24 May 2012 16:15:41 +0200, Zdenek Kabelac <zdenek.kabelac at gmail.com> wrote: >> Hi >> >> Since I've started to use ?SNA driver (when UXA appeared to be very >> slow), I'm ?facing higher number of Xorg crashes. >> SNA is faster, but less stable then UXA is. > > They are all debugging assertions caused by the earlier GPU hang, to > catch instances were we are losing commands and thus potentially > corrupting the output due to the loss of the GPU. Tip, don't hang the > GPU or don't ask for the bt. > -Chris > > -- Ok - I think I've figured out relatively simple way to trigger this issue on my machine. I'll also probably provide a list of memleaks which popped out and other sets of problem. So I just have to run Xorg server with valgrind and run couple programs. What I've not yet figured out is - if the is really fault of intel driver - or synaptic handle (which seems to have higher probability) Anyway - here is the log from valgring just in the moment of kernel reported GPU hang. Process terminating with default action of signal 11 (SIGSEGV): dumping core General Protection Fault at 0x6B23165: __sprintf_chk (sprintf_chk.c:27) by 0x468E0C: LogVWrite (stdio2.h:34) by 0x468B3B: ErrorF (log.c:641) by 0x550765: mieqEnqueue (mieq.c:280) by 0x447F01: queueEventList (getevents.c:974) by 0x48F9CF: xf86PostMotionEvent (xf86Xinput.c:1045) by 0xB294D14: HandleState (synaptics.c:3370) by 0xB296D91: ReadInput (synaptics.c:1721) by 0x480206: xf86SigioReadInput (xf86Events.c:298) by 0x4A439F: xf86SIGIO (sigio.c:108) by 0x582054F: ??? (in /usr/lib64/libpthread-2.15.90.so) by 0x6B06316: ioctl (syscall-template.S:81) by 0x8775807: drmIoctl (xf86drm.c:167) by 0x8777B55: drmCommandNone (xf86drm.c:2357) by 0x8BBC84F: kgem_throttle (kgem.c:1924) by 0x8BE4A16: sna_accel_block_handler (sna_accel.c:12069) by 0x438149: BlockHandler (dixutils.c:387) by 0x462313: WaitForSomething (WaitFor.c:210) by 0x434080: Dispatch (dispatch.c:357) by 0x423404: main (main.c:288) (using git 8ea4ba081de0206351394481f54dcbe6922a085b for intel driver (to match code lines)) I'm unsure how the handling of synaptic events and mouse cursor movement are related together. Is there something I should enable for kernel part of intel driver to get better explanation for GPU hang ? Zdenek
