Re: [PATCH] debugobjects: Don't call fill_pool() in early boot non-task context of RT kernel

[Thomas Gleixner]

On Wed, May 20 2026 at 12:57, Waiman Long wrote:
> On 5/20/26 12:43 PM, Waiman Long wrote:
>> It shouldn't really be a problem as fill_poll() will not called from
>> non-preemptible context after early boot, but the lockdep warning can
>> still cause confusion and anxiety. Fix that by further restricting the
>> call to only in_task() context during early boot.
>
> Sorry, the above paragraph isn't right. Will send out a v2.

And please trim the back trace while at it.

>> Fixes: 06e0ae988f6e ("debugobjects: Allow to refill the pool before SYSTEM_SCHEDULING")
>> Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
>> ---
>>   lib/debugobjects.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/debugobjects.c b/lib/debugobjects.c
>> index 12e2e42e6a31..236ea5e716df 100644
>> --- a/lib/debugobjects.c
>> +++ b/lib/debugobjects.c
>> @@ -727,11 +727,14 @@ static void debug_objects_fill_pool(void)
>>   
>>   	/*
>>   	 * On RT enabled kernels the pool refill must happen in preemptible
>> -	 * context -- for !RT kernels we rely on the fact that spinlock_t and
>> +	 * context or in task context during early boot.
>> +	 *
>> +	 * For !RT kernels we rely on the fact that spinlock_t and
>>   	 * raw_spinlock_t are basically the same type and this lock-type
>>   	 * inversion works just fine.
>>   	 */
>> -	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible() || system_state < SYSTEM_SCHEDULING) {
>> +	if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible() ||
>> +	   (system_state < SYSTEM_SCHEDULING && in_task())) {

Conflicts with:

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=core/urgent