Hi Sebastian,
an Intel Bay Trail board (Intel(R) Celeron(R) CPU J1900 @ 1.99GHz) at
the OSADL QA Farm rack #b/slot #6 (https://www.osadl.org/?id=1894)
stops
working every 12 to 36 hours. The only way to get the board back to
work
[..]
Could you try this:
--
Subject: [PATCH] kernel/irq_work: fix no_hz deadlock
Invoking NO_HZ's irq_work callback from timer irq is not working very
well if the callback decides to invoke hrtimer_cancel():
|hrtimer_try_to_cancel+0x55/0x5f
|hrtimer_cancel+0x16/0x28
|tick_nohz_restart+0x17/0x72
|__tick_nohz_full_check+0x8e/0x93
|nohz_full_kick_work_func+0xe/0x10
|irq_work_run_list+0x39/0x57
|irq_work_tick+0x60/0x67
|update_process_times+0x57/0x67
|tick_sched_handle+0x4a/0x59
|tick_sched_timer+0x3b/0x64
|__run_hrtimer+0x7a/0x149
|hrtimer_interrupt+0x1cc/0x2c5
and here we deadlock while waiting for the lock which we are holding.
To fix this I'm doing the same thing that upstream is doing: is the
irq_work dedicated IRQ and use it only for what is marked as "hirq"
which should only be the FULL_NO_HZ related work.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
[..]
Thanks a lot! Applied the patch and restarted the box. Given the fact
that it took up to 36 hours until the board stopped, we unfortunately
need to see at least one week of crash-free operation, before we may
consider the bug as fixed.
The board survived nine days without a crash -> RESOLVED.
Thanks,
Carsten.
--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
