Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3
From: Florian Schmidt (mista.tapas_at_gmx.net)
Date: 11/17/04
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Date: Wed, 17 Nov 2004 14:00:36 +0100 To: Ingo Molnar <mingo@elte.hu>
On Wed, 17 Nov 2004 14:45:09 +0100
Ingo Molnar <mingo@elte.hu> wrote:
>
> * Florian Schmidt <mista.tapas@gmx.net> wrote:
>
> > > > I had rtc_wakeup running with a rtc frequency of 8192 hz at the time
> > > > plus some general usage (reading mails, etc..) In earlier kernels it
> > > > seemed that the lock fell together with the rtc IRQ being piggy. will
> > > > try to reproduce now with the freshest RP kernel.
> >
> > I am not all certain that there really is a correlation like this. It
> > might have been coincidence. This boot locked again when i was in X
> > for 1 minute for checking mails. So again no console output.
>
> managed to reproduce the lockup on my testbox, using your .config,
> running rtc_wakeup -f 8192 and starting X. Hard hang and i had IRQ1 at
> prio 99. Will turn on the NMI watchdog now, hopefully this lockup will
> stay easy to reproduce.
Hi,
i experienced another one. But as i stayed on the console sysrq was
available, so i can send you the last locks listed by sysrq-t.
The scenario was this:
rtc_wakeup -f 8192 in one console
some find /'s in another
Now i changed to a third console and put some load on the system my doing
make clean bzImage in some kernel source dir.
right after hitting enter after typing "make clean bziage" i got another
piggy message and the machine locked. It seems (to my uneducated mind) cc1
and rtc_wakeup both are involved with this as the list of held locks (or the
part of the list which i can see) shows them.
there were 5 locks of the following form
&drive-gendev_rel_sem
init
init_hwif_data
2 locks of this form:
&tty->atomic_read
getty
reasd_char
and these:
&mm->page_table_lock
cc1
exit_mmap
&mm->mmap_sem
rtc_wakeup
do_page_fault
&mm->page_table_lock
rtc_wakeup
handle_mm_fault
&serio_lock
IRQ 1
serio_interrupt
sysrq_table_lock
IRQ 1
__handle_sysrq
flo
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- Previous message: Roman Zippel: "Re: [2.6 patch] DEBUG_BUGVERBOSE for i386 (fwd)"
- In reply to: Ingo Molnar: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3"
- Next in thread: Ingo Molnar: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3"
- Reply: Ingo Molnar: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.27-3"
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