On Fri, 2023-10-06 at 16:00 +0200, Peter Zijlstra wrote: > On Fri, Oct 06, 2023 at 12:31:28PM +0200, Mike Galbraith wrote: > > On Fri, 2023-10-06 at 10:35 +0200, Marek Szyprowski wrote: > > > > > > > > > Just to note, I've run into this issue on the QEmu's 'arm64/virt' > > > platform, not on the Samsung specific hardware. > > > > It doesn't appear to be arch specific, all I have to do is enable > > autogroup, raspberry or x86_64 desktop box, the occasional failure > > tripping over task groups, leaving both best and best_left with > > identical but not what we're looking for ->min_deadline. > > OK, autogroups enabled and booted, /debug/sched/debug shows autogroups > are indeed in existence. > > I've ran hackbench and a kernel build, but no whoopsie yet :-( > > I suppose I'll kick some benchmarks and go make a cup 'o tea or > something. Hm, just booting gets me a handful, and generic desktop activity produces a fairly regular supply. This is virgin 6.6.0.ga9e6eb3-tip. [ 340.473123] EEVDF scheduling fail, picking leftmost [ 340.473132] EEVDF scheduling fail, picking leftmost [ 343.656549] EEVDF scheduling fail, picking leftmost [ 343.656557] EEVDF scheduling fail, picking leftmost [ 343.690463] EEVDF scheduling fail, picking leftmost [ 343.690472] EEVDF scheduling fail, picking leftmost [ 426.224039] EEVDF scheduling fail, picking leftmost [ 426.224080] EEVDF scheduling fail, picking leftmost [ 426.224084] EEVDF scheduling fail, picking leftmost [ 426.363323] EEVDF scheduling fail, picking leftmost [ 426.759244] EEVDF scheduling fail, picking leftmost [ 426.759256] EEVDF scheduling fail, picking leftmost [ 441.872524] EEVDF scheduling fail, picking leftmost [ 441.872556] EEVDF scheduling fail, picking leftmost
