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version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Aug 18, 2025 at 10:33:51AM +0800, yangshiguang wrote: > > > > At 2025-08-18 10:22:36, "Harry Yoo" wrote: > > >On Mon, Aug 18, 2025 at 10:07:40AM +0800, yangshiguang wrote: > >> > >> > >> At 2025-08-16 18:46:12, "Harry Yoo" wrote: > >> >On Sat, Aug 16, 2025 at 06:05:15PM +0800, yangshiguang wrote: > >> >> > >> >> > >> >> At 2025-08-16 16:25:25, "Harry Yoo" wrote: > >> >> >On Thu, Aug 14, 2025 at 07:16:42PM +0800, yangshiguang1011@163.com wrote: > >> >> >> From: yangshiguang > >> >> >> > >> >> >> From: yangshiguang > >> >> >> > >> >> >> set_track_prepare() can incur lock recursion. > >> >> >> The issue is that it is called from hrtimer_start_range_ns > >> >> >> holding the per_cpu(hrtimer_bases)[n].lock, but when enabled > >> >> >> CONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare, > >> >> >> and try to hold the per_cpu(hrtimer_bases)[n].lock. > >> >> >> > >> >> >> So avoid waking up kswapd.The oops looks something like: > >> >> > > >> >> >Hi yangshiguang, > >> >> > > >> >> >In the next revision, could you please elaborate the commit message > >> >> >to reflect how this change avoids waking up kswapd? > >> >> > > >> >> > >> >> of course. Thanks for the reminder. > >> >> > >> >> >> BUG: spinlock recursion on CPU#3, swapper/3/0 > >> >> >> lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3 > >> >> >> Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT) > >> >> >> Call trace: > >> >> >> spin_bug+0x0 > >> >> >> _raw_spin_lock_irqsave+0x80 > >> >> >> hrtimer_try_to_cancel+0x94 > >> >> >> task_contending+0x10c > >> >> >> enqueue_dl_entity+0x2a4 > >> >> >> dl_server_start+0x74 > >> >> >> enqueue_task_fair+0x568 > >> >> >> enqueue_task+0xac > >> >> >> do_activate_task+0x14c > >> >> >> ttwu_do_activate+0xcc > >> >> >> try_to_wake_up+0x6c8 > >> >> >> default_wake_function+0x20 > >> >> >> autoremove_wake_function+0x1c > >> >> >> __wake_up+0xac > >> >> >> wakeup_kswapd+0x19c > >> >> >> wake_all_kswapds+0x78 > >> >> >> __alloc_pages_slowpath+0x1ac > >> >> >> __alloc_pages_noprof+0x298 > >> >> >> stack_depot_save_flags+0x6b0 > >> >> >> stack_depot_save+0x14 > >> >> >> set_track_prepare+0x5c > >> >> >> ___slab_alloc+0xccc > >> >> >> __kmalloc_cache_noprof+0x470 > >> >> >> __set_page_owner+0x2bc > >> >> >> post_alloc_hook[jt]+0x1b8 > >> >> >> prep_new_page+0x28 > >> >> >> get_page_from_freelist+0x1edc > >> >> >> __alloc_pages_noprof+0x13c > >> >> >> alloc_slab_page+0x244 > >> >> >> allocate_slab+0x7c > >> >> >> ___slab_alloc+0x8e8 > >> >> >> kmem_cache_alloc_noprof+0x450 > >> >> >> debug_objects_fill_pool+0x22c > >> >> >> debug_object_activate+0x40 > >> >> >> enqueue_hrtimer[jt]+0xdc > >> >> >> hrtimer_start_range_ns+0x5f8 > >> >> >> ... > >> >> >> > >> >> >> Signed-off-by: yangshiguang > >> >> >> Fixes: 5cf909c553e9 ("mm/slub: use stackdepot to save stack trace in objects") > >> >> >> --- > >> >> >> v1 -> v2: > >> >> >> propagate gfp flags to set_track_prepare() > >> >> >> > >> >> >> [1] https://urldefense.com/v3/__https://lore.kernel.org/all/20250801065121.876793-1-yangshiguang1011@163.com__;!!ACWV5N9M2RV99hQ!JMgEQrzDS3VAAKdSyj3ge_ZLG1QWaEHA7hH5uL7_Js06GM5m1sYGVOmJHkiTuOeaiE-IizWyvPNtiwzH291FRIojhPs$ > >> >> >> --- > >> >> >> mm/slub.c | 21 +++++++++++---------- > >> >> >> 1 file changed, 11 insertions(+), 10 deletions(-) > >> >> >> > >> >> >> diff --git a/mm/slub.c b/mm/slub.c > >> >> >> index 30003763d224..dba905bf1e03 100644 > >> >> >> --- a/mm/slub.c > >> >> >> +++ b/mm/slub.c > >> >> >> @@ -962,19 +962,20 @@ static struct track *get_track(struct kmem_cache *s, void *object, > >> >> >> } > >> >> >> > >> >> >> #ifdef CONFIG_STACKDEPOT > >> >> >> -static noinline depot_stack_handle_t set_track_prepare(void) > >> >> >> +static noinline depot_stack_handle_t set_track_prepare(gfp_t gfp_flags) > >> >> >> { > >> >> >> depot_stack_handle_t handle; > >> >> >> unsigned long entries[TRACK_ADDRS_COUNT]; > >> >> >> unsigned int nr_entries; > >> >> >> + gfp_flags &= GFP_NOWAIT; > >> >> > > >> >> >Is there any reason to downgrade it to GFP_NOWAIT when the gfp flag allows > >> >> >direct reclamation? > >> >> > > >> >> > >> >> Hi Harry, > >> >> > >> >> The original allocation is GFP_NOWAIT. > >> >> So I think it's better not to increase the allocation cost here. > >> > > >> >I don't think the allocation cost is important here, because collecting > >> >a stack trace for each alloc/free is quite slow anyway. And we don't really > >> >care about performance in debug caches (it isn't designed to be > >> >performant). > >> > > >> >I think it was GFP_NOWAIT because it was considered safe without > >> >regard to the GFP flags passed, rather than due to performance > >> >considerations. > >> > > >> Hi harry, > >> > >> Is that so? > >> gfp_flags &= (GFP_NOWAIT | __GFP_DIRECT_RECLAIM); > > > >This still clears gfp flags passed by the caller to the allocator. > >Why not use gfp_flags directly without clearing some flags? > > > > Hi Harry, > > > This introduces new problems. > > call stackļ¼š > dump_backtrace+0xfc/0x17c > show_stack+0x18/0x28 > dump_stack_lvl+0x40/0xc0 > dump_stack+0x18/0x24 > __might_resched+0x164/0x184 > __might_sleep+0x38/0x84 > prepare_alloc_pages+0xc0/0x17c > __alloc_pages_noprof+0x130/0x3f8 > stack_depot_save_flags+0x5a8/0x6bc > stack_depot_save+0x14/0x24 > set_track_prepare+0x64/0x90 > ___slab_alloc+0xc14/0xc48 > __kmalloc_cache_noprof+0x398/0x568 > __kthread_create_on_node+0x8c/0x1f0 > kthread_create_on_node+0x4c/0x74 > create_worker+0xe0/0x298 > workqueue_init+0x228/0x324 > kernel_init_freeable+0x124/0x1c8 > kernel_init+0x20/0x1ac > ret_from_fork+0x10/0x20 Ok, because preemption is disabled in ___slab_alloc(), blocking allocations are not allowed even when gfp_flags allows it. So __GFP_DIRECT_RECLAIM should be cleared. So, /* Preemption is disabled in ___slab_alloc() */ gfp_flags &= ~(__GFP_DIRECT_RECLAIM); should work? > Of course there are other problems. > > So it is best to limit gtp flags. -- Cheers, Harry / Hyeonggon