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"spasswolf@web.de Tejun Heo" , Sebastian Andrzej Siewior , Thomas Gleixner , dschatzberg@meta.com, peterz@infradead.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Date: Tue, 24 Feb 2026 13:58:19 +0100 In-Reply-To: References: <20260219164648.3014-1-spasswolf@web.de> <594b9094ab76acf9e73cad8fca9c9efd6f75a980.camel@web.de> <20260219195851.7a7bd1b2@fedora> <1d56c93ee93334b9d320c93d255d7548f4497836.camel@web.de> <20260220104420.54610b04@gandalf.local.home> <20260223032257.4e6db467@fedora> <80f657156fb2d32d8fe246e65e9ac8bf9d7cfbd5.camel@web.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.56.2-0+deb13u1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:RvkkhTGq5MKQ89s7x/XKhs7BepN1GVXNHNFqHAo1RUYoeQz5O+S BGaozKkQ1TP4XsOHxOJYbRzTVC41jG63u0IqDmq5oXtq1O6hO6XIGpmYkLeSwDjJznxuRxq 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printk()s are filtered by command name > (a previous patch showed systemd to be the problematic process): >=20 > diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c > index 5f0d33b04910..7bb6931a4d86 100644 > --- a/kernel/cgroup/cgroup.c > +++ b/kernel/cgroup/cgroup.c > @@ -6990,25 +6990,32 @@ static void do_cgroup_task_dead(struct task_stru= ct *tsk) > { > struct css_set *cset; > unsigned long flags; > + printk(KERN_INFO "%s 0: task =3D %px\n", __func__, tsk); > =20 > spin_lock_irqsave(&css_set_lock, flags); > =20 > + printk(KERN_INFO "%s 1: task =3D %px\n", __func__, tsk); > WARN_ON_ONCE(list_empty(&tsk->cg_list)); > cset =3D task_css_set(tsk); > + printk(KERN_INFO "%s 2: task =3D %px\n", __func__, tsk); > css_set_move_task(tsk, cset, NULL, false); > + printk(KERN_INFO "%s 3: task =3D %px\n", __func__, tsk); > cset->nr_tasks--; > /* matches the signal->live check in css_task_iter_advance() */ > if (thread_group_leader(tsk) && atomic_read(&tsk->signal->live)) > list_add_tail(&tsk->cg_list, &cset->dying_tasks); > =20 > + printk(KERN_INFO "%s 4: task =3D %px\n", __func__, tsk); > if (dl_task(tsk)) > dec_dl_tasks_cs(tsk); > =20 > + printk(KERN_INFO "%s 5: task =3D %px\n", __func__, tsk); > WARN_ON_ONCE(cgroup_task_frozen(tsk)); > if (unlikely(!(tsk->flags & PF_KTHREAD) && > test_bit(CGRP_FREEZE, &task_dfl_cgroup(tsk)->flags))) > cgroup_update_frozen(task_dfl_cgroup(tsk)); > =20 > + printk(KERN_INFO "%s 6: task =3D %px\n", __func__, tsk); > spin_unlock_irqrestore(&css_set_lock, flags); > } > =20 > @@ -7029,9 +7036,11 @@ static void cgrp_dead_tasks_iwork_fn(struct irq_w= ork *iwork) > { > struct llist_node *lnode; > struct task_struct *task, *next; > + printk(KERN_INFO "%s:\n", __func__); > =20 > lnode =3D llist_del_all(this_cpu_ptr(&cgrp_dead_tasks)); > llist_for_each_entry_safe(task, next, lnode, cg_dead_lnode) { > + printk(KERN_INFO "%s: %px %s", __func__, task, task->comm); > do_cgroup_task_dead(task); > put_task_struct(task); > } > @@ -7050,6 +7059,7 @@ static void __init cgroup_rt_init(void) > =20 > void cgroup_task_dead(struct task_struct *task) > { > + printk(KERN_INFO "%s: task =3D %px (%s)\n", __func__, task, task->comm= ); > get_task_struct(task); > llist_add(&task->cg_dead_lnode, this_cpu_ptr(&cgrp_dead_tasks)); > irq_work_queue(this_cpu_ptr(&cgrp_dead_tasks_iwork)); > @@ -7059,6 +7069,7 @@ static void __init cgroup_rt_init(void) {} > =20 > void cgroup_task_dead(struct task_struct *task) > { > + printk(KERN_INFO "%s: task =3D %px (%s)\n", __func__, task, task->comm= ); > do_cgroup_task_dead(task); > } > #endif /* CONFIG_PREEMPT_RT */ > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index 854984967fe2..73e477d8cf1a 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -5078,6 +5078,8 @@ static struct rq *finish_task_switch(struct task_s= truct *prev) > struct rq *rq =3D this_rq(); > struct mm_struct *mm =3D rq->prev_mm; > unsigned int prev_state; > + if (!strcmp(prev->comm, "systemd")) > + printk(KERN_INFO "%s 0: %px\n", __func__, prev); > =20 > /* > * The previous task will have left us with a preempt_count of 2 > @@ -5144,15 +5146,18 @@ static struct rq *finish_task_switch(struct task= _struct *prev) > } > =20 > if (unlikely(prev_state =3D=3D TASK_DEAD)) { > + printk(KERN_INFO "%s 1: %px (%s)\n", __func__, prev, prev->comm); > if (prev->sched_class->task_dead) > prev->sched_class->task_dead(prev); > =20 > + printk(KERN_INFO "%s 2: %px (%s)\n", __func__, prev, prev->comm); > /* > * sched_ext_dead() must come before cgroup_task_dead() to > * prevent cgroups from being removed while its member tasks are > * visible to SCX schedulers. > */ > sched_ext_dead(prev); > + printk(KERN_INFO "%s 3: %px (%s)\n", __func__, prev, prev->comm); > cgroup_task_dead(prev); > =20 > /* Task is done with its stack. */ > @@ -5202,6 +5207,8 @@ static __always_inline struct rq * > context_switch(struct rq *rq, struct task_struct *prev, > struct task_struct *next, struct rq_flags *rf) > { > + if (!strcmp(prev->comm, "systemd")) > + printk(KERN_INFO "%s 0: %px\n", __func__, prev); > prepare_task_switch(rq, prev, next); > =20 > /* >=20 >=20 > I also tried monitoring the schedule_tail(), which is one of the two fun= ction calling > finish_task_switch(), but that did get rid of the delay. This is incorrect. Monitoring schedule_tail() does not undo the delayed sh= utdown, but the delay probalbly has only 95% reproducability. >=20 > The result from this is: > 2026-02-24T13:13:21.739185+01:00 localhost 12,32039,34364889,-,caller=3D= T2955;reboot=20 > [...] > Here the delay section begins (all message here have comm =3D=3D "system= d"): > 2026-02-24T13:13:38.124013+01:00 localhost 6,45456,50748843,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.124234+01:00 localhost 6,45457,50748851,-,caller=3DT= 0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.271984+01:00 localhost 6,45458,50896237,-,caller=3DT= 1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.272255+01:00 localhost 6,45459,50896244,-,caller=3DT= 52;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.272556+01:00 localhost 6,45460,50896287,-,caller=3DT= 1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.272759+01:00 localhost 6,45461,50896289,-,caller=3DT= 51;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.273225+01:00 localhost 6,45462,50896303,-,caller=3DT= 1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.273406+01:00 localhost 6,45463,50896305,-,caller=3DT= 51;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.273819+01:00 localhost 6,45464,50896481,-,caller=3DT= 1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.274025+01:00 localhost 6,45465,50896484,-,caller=3DT= 0;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:13:38.274465+01:00 localhost 6,45466,50896801,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.274635+01:00 localhost 6,45467,50896804,-,caller=3DT= 0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.275034+01:00 localhost 6,45468,50897328,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.275254+01:00 localhost 6,45469,50897331,-,caller=3DT= 2077;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.275680+01:00 localhost 6,45470,50897600,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.275886+01:00 localhost 6,45471,50897602,-,caller=3DT= 0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.276300+01:00 localhost 6,45472,50897936,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.276487+01:00 localhost 6,45473,50897939,-,caller=3DT= 0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.276907+01:00 localhost 6,45474,50898225,-,caller=3DT= 1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:13:38.279144+01:00 localhost 6,45475,50898228,-,caller=3DT= 68;finish_task_switch 0: ffff97fd40884300 >=20 > [...] 1505 similar lines removed >=20 > 2026-02-24T13:14:54.000427+01:00 localhost 6,46981,126614226,-,caller=3D= T44;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.000967+01:00 localhost 6,46982,126614420,-,caller=3D= T1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.001060+01:00 localhost 6,46983,126614422,-,caller=3D= T0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.001562+01:00 localhost 6,46984,126614462,-,caller=3D= T1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.001666+01:00 localhost 6,46985,126614463,-,caller=3D= T0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.002182+01:00 localhost 6,46986,126614533,-,caller=3D= T1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.002296+01:00 localhost 6,46987,126614534,-,caller=3D= T0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.002811+01:00 localhost 6,46988,126615219,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.002910+01:00 localhost 6,46989,126615221,-,caller=3D= T42;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.003402+01:00 localhost 6,46990,126616376,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.003510+01:00 localhost 6,46991,126616378,-,caller=3D= T0;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.004034+01:00 localhost 6,46992,126621884,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.004125+01:00 localhost 6,46993,126621887,-,caller=3D= T0;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.004645+01:00 localhost 6,46994,126625311,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.004734+01:00 localhost 6,46995,126625314,-,caller=3D= T235;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.013405+01:00 localhost 6,46996,126637601,-,caller=3D= T1;context_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.013614+01:00 localhost 6,46997,126637603,-,caller=3D= T0;finish_task_switch 0: ffff97fd40884300 > 2026-02-24T13:14:54.014165+01:00 localhost 6,46998,126638229,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.014266+01:00 localhost 6,46999,126638232,-,caller=3D= T44;finish_task_switch 0: ffff97fd46050000 > 2026-02-24T13:14:54.014774+01:00 localhost 6,47000,126638469,-,caller=3D= T1573;context_switch 0: ffff97fd46050000 END >=20 > So there's something strange going on here with the scheduler. >=20 >=20 > Bert Karwatzki