On Thu, May 20, 2021 at 09:53:02AM +0200, Peter N. M. Hansteen wrote: > On Thu, May 20, 2021 at 08:53:14AM +1000, Jonathan Gray wrote: > > On Wed, May 19, 2021 at 06:32:01PM +0200, Peter N. M. Hansteen wrote: > > > On Wed, May 19, 2021 at 04:43:44PM +0200, Peter N. M. Hansteen wrote: > > > > > outdated...) > > > > > > > > I tried the first, that only seemed to have the effect of having > > > > the freeze come faster. So I commented out that part of the xorg.conf > > > > and I'm trying the steps in the README now, but for some reasons I > > > > don't get any dumps in /var/crash as expected. Then again I could well > > > > be missing some crucial step. > > > > > > Still no luck getting coredumps but when I sshed in after the last freeze > > > the last two lines of dmesg were > > > > > > [drm] *ERROR* ring sdma0 timeout, signaled seq=110053, emitted seq=110053 > > > [drm] *ERROR* Process information: process pid 0 thread pid 0 > > > > > > the [drm] part has me suspect this is related (but I don't know what sdma > > > signifies in this context) > > > > sdma is the asynchronous System DMA engine > > > > Ring timeouts like this are a known problem with amdgpu which persist > > across multiple major drm versions. > > Looking at what appears in the log (/var/log/messages) the time when X > freezes corresponds very well with when those messages are recorded. > > The question is, how do I usefully debug this? I've gone over the README's > procedure a few times now and it unfortunately does not produce any coredumps > or traces.
When the X server is locked up I can still ssh into the machine and attach a debugger to the running process. I've got a few backtraces from that, but without full symbols it's even harder to understand what's going on. I suspect issues with our futex implementation; in every case I find one thread stuck in a drm ioctl while others are blocked on futex waits. Running an X server + Mesa fully built with debug symbols seem to make the issue less frequent and when it happenned I didn't have time to launch a debugger on it so far... > > One option is of course to trade up or sideways to something like > https://www.power.no/data-og-tilbehoer/pc-og-mac/baerbar-pc/asus-zenbook-s-ux393ea-pure2-13-laptop/p-1115705/ > (Intel Core i7-1165G7 with Iris Xe graphics), but would that have a better > chance of success (or for that matter be helpful to the project)? Which window manager / desktop environment are you using ? I've tried to back to WindowMaker (from xfwm4) and it also seems to not trigger the lock ups on a Ryzen Vega. But it hasn't been long enough. Sometime I can run for days without a lockup and sometimes it locks up after minutes. BTW this also leads me to wonder if KARL could have an impact on the issue in case there is some un-initialized memory access somewhere in the code... > > All the best, > Peter > > -- > Peter N. M. Hansteen, member of the first RFC 1149 implementation team > http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ > "Remember to set the evil bit on all malicious network traffic" > delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds. -- Matthieu Herrb
