On 2022-06-15 16:53:55 [+0200], Juri Lelli wrote: > Hi, Hi, > My understanding is that we have > > fs/aio.c::read_events > wait_event_interruptible_hrtimeout > __wait_event_hrtimeout > hrtimer_init_sleeper_on_stack <- this might mode |=HRTIMER_MODE_HARD on RT will set HRTIMER_MODE_HARD of might set HRTIMER_MODE_HARD if the task has elevated priority (RT/DL). > hrtimer_start_range_ns > WARN_ON_ONCE(!(mode & HRTIMER_MODE_HARD) ^ !timer->is_hard) > fires since the latter doesn't see the change of mode done by > init_sleeper correct. > The attached patch seems to cure the problem, although I'm not entirely > sure it's the cleanest fix (if I'm right at all about it :). The problem seems to be that __wait_event_hrtimeout() does hrtimer_start_range_ns() instead of hrtimer_sleeper_start_expires(). So if you switch that, then it should go away. > Thanks, > Juri Sebastian
