Re: [PATCH] kernel/hung_task.c: printk address for hung_task
From: Kassey
Date: Thu Jan 14 2016 - 04:33:12 EST
Xinhui:
when I got a DDR dump, with the task_struct address for this
task, I can see what file this task is accessing, as well as
task_struct member.
this is very useful and popular on arch where we can generate a
DDR dump when system crash.
BR
Kassey
On Thu, Jan 14, 2016 at 10:45 AM, Pan Xinhui <xinhui@xxxxxxxxxxxxxxxxxx> wrote:
> hi, Li
> I have a little confusion. for what you want to know this ptr's value. Can that help you debug or root the cause?
> I'm just wondering :)
>
> thanks
> xinhui
>
> On 2016å01æ13æ 10:42, Li wrote:
>> From: Kassey Li <kassey1216@xxxxxxxxx>
>>
>> this is used to check task_struct info when got a dump.
>>
>> Signed-off-by: Kassey Li <kassey1216@xxxxxxxxx>
>> ---
>> kernel/hung_task.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/hung_task.c b/kernel/hung_task.c
>> index d234022..b5dd7dd 100644
>> --- a/kernel/hung_task.c
>> +++ b/kernel/hung_task.c
>> @@ -108,8 +108,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
>> * Ok, the task did not get scheduled for more than 2 minutes,
>> * complain:
>> */
>> - pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
>> - t->comm, t->pid, timeout);
>> + pr_err("INFO: task %s:%d 0x%p blocked for more than %ld seconds.\n",
>> + t->comm, t->pid, t, timeout);
>> pr_err(" %s %s %.*s\n",
>> print_tainted(), init_utsname()->release,
>> (int)strcspn(init_utsname()->version, " "),
>>
>
--
Best regards
Kassey