|Summary:||X hang at random while using GL app with mach64 with "timeout waiting for buffers"|
|Product:||DRI||Reporter:||Olivier Valentin <valentio>|
|Component:||DRM/other||Assignee:||Default DRI bug account <dri-devel>|
|Status:||RESOLVED INVALID||QA Contact:|
|i915 platform:||i915 features:|
Description Olivier Valentin 2008-07-23 01:03:35 UTC
Created attachment 17831 [details] The end of kern.log that seems to happen just before it hangs I compiled mach64 drm module from git, libopengl and the dri xorg module (still mach64). After playing a little with an opengl app, the screen goes black and nothing responds. The machine seems not completely hang, but X prevents any further action but rebooting. The kernel log ends with the following message: Jul 23 07:55:04 chibchas kernel: [ 451.014390] [drm:mach64_freelist_get] *ERROR* timeout waiting for buffers: ring head_addr: 0x50000e80 head: 928 tail: 1440 Jul 23 07:55:04 chibchas kernel: [ 451.014400] [drm:mach64_dma_dispatch_vertex] *ERROR* couldn't get buffer My dist/level is an unstable debian freshly dist-upgraded. I use EXA. The card is a "ATI Technologies Inc Rage Mobility P/M AGP 2x (rev 64)" I'll try to give a X log.
Comment 1 Olivier Valentin 2008-07-23 01:25:28 UTC
I said screen goes black... I was wrong, it just freezes and I still see the last image of my game. It happens even using XAA. There is nothing special at the end of the X log (it seems to really hang and never realize it).
Comment 2 Olivier Valentin 2008-07-24 04:47:48 UTC
I located the failing condition in shared-core/mach64_dma.c:1652, from what I understand, the code waits up to 1 second to acquire a free message structure from a ring. But in my case this sometimes fails. Then I tried to give a true value to MACH64_EXTRA_CHECKING in shared-core/mach64_drv.h, and since then, I was unable to make it freeze again. Which looks quite insane since this flag is intended to detect problems and when it detects one, at least prints a message. But there is no message ! So this sounds like it fixes by "adding a delay" or by side effects !
Comment 3 Martin Peres 2019-10-14 13:20:09 UTC
Hi, Freedesktop's Bugzilla instance is EOLed and open bugs are about to be migrated to http://gitlab.freedesktop.org. To avoid migrating out of date bugs, I am now closing all the bugs that did not see any activity in the past year. If the issue is still happening, please create a new bug in the relevant project at https://gitlab.freedesktop.org/drm (use misc by default). Sorry about the noise!