I'll see if I can try that this weekend.
Thanks.
On Fri, Jun 5, 2009 at 1:30 PM, Jeff Mahoney<jeffm@xxxxxxxx> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Trenton D. Adams wrote:
>> FYI: I never did anything specific that I knew of, so I didn't
>> actually notice a delay. I was rsyncing to a USB key at the time.
>> And seeing it took over an hour, I walked away, so I wouldn't have
>> noticed it. But, I could fiddle around a little to see if I could get
>> some sort of delay going on. Any ideas on what I should try? Then I
>> can do the sysreq+t for you if I can reproduce.
>
> Well if the rsync triggered it, that's a good start.
>
> Try applying the following patch as well. It will cause the hung task detector
> to do a sysrq+t automatically so it's not as much of a guessing game. You'll need to boot with
> hung_task_show_state=1.
>
> - -Jeff
>
> - ---
> kernel/hung_task.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> - --- a/kernel/hung_task.c
> +++ b/kernel/hung_task.c
> @@ -56,6 +56,14 @@ static int __init hung_task_panic_setup(
> }
> __setup("hung_task_panic=", hung_task_panic_setup);
>
> +unsigned int __read_mostly sysctl_hung_task_show_state;
> +static int __init hung_task_show_state_setup(char *str)
> +{
> + sysctl_hung_task_show_state = simple_strtoul(str, NULL, 0);
> + return 1;
> +}
> +__setup("hung_task_show_state=", hung_task_show_state_setup);
> +
> static int
> hung_task_panic(struct notifier_block *this, unsigned long event, void *ptr)
> {
> @@ -102,6 +110,9 @@ static void check_hung_task(struct task_
>
> touch_nmi_watchdog();
>
> + if (sysctl_hung_task_show_state)
> + show_state();
> +
> if (sysctl_hung_task_panic)
> panic("hung_task: blocked tasks");
> }
>
> - --
> Jeff Mahoney
> SUSE Labs
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