The following commit has been merged into the core/debugobjects branch of tip: Commit-ID: c4db2d3b70e586c7c856c891f4f7052e8d789a06 Gitweb: https://git.kernel.org/tip/c4db2d3b70e586c7c856c891f4f7052e8d789a06 Author: Stephen Boyd <swboyd@xxxxxxxxxxxx> AuthorDate: Thu, 19 May 2022 13:22:01 -07:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Fri, 02 Dec 2022 12:32:24 +01:00 debugobjects: Print object pointer in debug_print_object() Delayed kobject debugging (CONFIG_DEBUG_KOBJECT_RELEASE) prints the kobject pointer that's being released in kobject_release() before scheduling a randomly delayed work to do the actual release work. If the caller of kobject_put() frees the kobject upon return then this will typically emit a debugobject warning about freeing an active timer. Usually the release function is the function that does the kfree() of the struct containing the kobject. For example the following print is seen kobject: 'queue' (ffff888114236190): kobject_release, parent 0000000000000000 (delayed 1000) ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: kobject_delayed_cleanup+0x0/0x390 but the kobject printk cannot be matched with the debug object printk because it could be any number of kobjects that was released around that time. The random delay for the work doesn't help either. Print the address of the object being tracked to help to figure out which kobject is the problem here. Note that this does not use %px here to match the other %p usage in debugobject debugging. Due to %p usage it is required to disable pointer hashing to correlate the two pointer printks. Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20220519202201.2348343-1-swboyd@xxxxxxxxxxxx --- lib/debugobjects.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/debugobjects.c b/lib/debugobjects.c index 337d797..4c670d3 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -500,9 +500,9 @@ static void debug_print_object(struct debug_obj *obj, char *msg) descr->debug_hint(obj->object) : NULL; limit++; WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " - "object type: %s hint: %pS\n", + "object: %p object type: %s hint: %pS\n", msg, obj_states[obj->state], obj->astate, - descr->name, hint); + obj->object, descr->name, hint); } debug_objects_warnings++; }
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