Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4]

Ingo Molnar
2004-10-30T11:32:13Z

* Ingo Molnar <mingo@elte.hu> wrote:

> > jackd:1507 userspace BUG: scheduling in user-atomic context!
> > [<c01069fc>] dump_stack+0x1c/0x20 (20)
> > [<c02834d0>] schedule+0x70/0x100 (24)
> > [<c010639b>] work_resched+0x6/0x17 (-8124)

> > jackd:1507 userspace BUG: scheduling in user-atomic context!
> > [<c01069fc>] dump_stack+0x1c/0x20 (20)
> > [<c02834d0>] schedule+0x70/0x100 (24)
> > [<c028465d>] down_write_mutex+0xbd/0x180 (36)
> > [<c012cbf6>] __mutex_lock+0x36/0x40 (16)
> > [<c012cc75>] _mutex_lock_irqsave+0x15/0x20 (16)
> > [<c01f1237>] tty_ldisc_try+0x17/0x50 (20)
> > [<c01f1287>] tty_ldisc_ref_wait+0x17/0xc0 (88)

> this too i'd consider a false positive, because this particular
> printout happened due to a mutex, and a mutex blockage we can consider
> involuntary blockage. [...]

i've uploaded -V0.5.15 with these two false positives fixed, could you
retry your Jackd workload and see whether any other type of scheduling
gets detected? Please also chrt the watchdog thread to a lower priority
than the main thread's priority.

Ingo