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AJvYcCXOcOzd1VM8VVWAInoxlY8jQikiqC/a2t3dlCj0COQ5+/7jdUM+7T0a4ha3F2hZq4yT2u9TPDWoMbVX/DU=@vger.kernel.org X-Gm-Message-State: AOJu0Yy3OHgZ9g0TwEP+/AGbh4JwCMt2P+71nchXhrm5nwDWgWk7kPXG ByRoAzK/sEoSfLIbzxk9E+maQD2t0LLQsUfb19eU9iuoGJHBFOqPUbYcdMFzvvPrzZ9K9ExjVwd BJAw3UiBhvxuiiEzLOBYAYX+OSUTX7fjoJF6j/D6hx/Do3m2ePRWoc41IXojogqQtpdAOMd/hjA mcRDNjfEqpTUQ2cdcCeQXe5gVAaDh6tgmu6d5jvYLd X-Gm-Gg: AY/fxX54KKTwcHVD5ZrDw3FwCG3A7uWx/I4/+KOSoHx+vMgS8gh115KH/OceS6eQIHy TScbWY85OTGXSCXgEqrUy8NpCKjR/3SOHzvrumz7d8R7STYYWj4NU7oBFj8DOwcjb2VmyVsQ22k 4rRaEoPluBu3CAdYCeSjhQX87cxgYaNtywdYpmzw1TvAuGvmV/WaSEMmXG50/dy6rR+s4= X-Received: by 2002:a05:7301:6781:b0:2ac:2e93:29bf with SMTP id 5a478bee46e88-2ac300f946dmr9763850eec.22.1765887186629; Tue, 16 Dec 2025 04:13:06 -0800 (PST) X-Google-Smtp-Source: AGHT+IEjGc2WYsjbwNRIC2Y9wS+61bYiJmx62asBMWKb7WI7DCgMmiHl5jQ/CDvP6Z6yF8KfsOJ7SWaQSa76Iwy1nHA= X-Received: by 2002:a05:7301:6781:b0:2ac:2e93:29bf with SMTP id 5a478bee46e88-2ac300f946dmr9763813eec.22.1765887186145; Tue, 16 Dec 2025 04:13:06 -0800 (PST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <202512161547.cd3a9187-lkp@intel.com> In-Reply-To: <202512161547.cd3a9187-lkp@intel.com> From: Pingfan Liu Date: Tue, 16 Dec 2025 20:12:53 +0800 X-Gm-Features: AQt7F2ol4858mU6B9qor1De7SjH19Kzxd8PFqaNyoG74tMMq5JYAX-sBEk1iu9o Message-ID: Subject: Re: [linus:master] [sched/deadline] 318e18ed22: BUG:soft_lockup-CPU##stuck_for#s![swapper:#] To: kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Tejun Heo , Waiman Long , Chen Ridong , Peter Zijlstra , Juri Lelli , Pierre Gondois , Ingo Molnar , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , aubrey.li@linux.intel.com, yu.c.chen@intel.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable i On Tue, Dec 16, 2025 at 3:45=E2=80=AFPM kernel test robot wrote: > > > > Hello, > > kernel test robot noticed "BUG:soft_lockup-CPU##stuck_for#s![swapper:#]" = on: > > commit: 318e18ed22e89397635e15095c014accaf47ed30 ("sched/deadline: Walk u= p cpuset hierarchy to decide root domain when hot-unplug") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > [test failed on linus/master d358e5254674b70f34c847715ca509e46eb81e6= f] > [test failed on linux-next/master 5ce74bc1b7cb2732b22f9c93082545bc655d654= 7] > > in testcase: trinity > version: trinity-static-i386-x86_64-f93256fb_2019-08-28 > with following parameters: > > runtime: 300s > group: group-03 > nr_groups: 5 > > > config: i386-randconfig-r071-20250410 There is no CONFIG_CPUSETS in this config file. So I think it is not related to cpuset_cpus_allowed_locked(). And there is no extra lock introduced into dl_add_task_root_domain(), so it is weird that the commit causes the soft lockup. I will look into it to see the real root cause. Pingfan > compiler: gcc-14 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 3= 2G > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > > we don't have enough knowledge to analyze the relation between the change > and the issue, so we run tests up to 1000 times. the issue can be reprodu= ced > 65 times out of 1000 runs. while parent always keeps clean. > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > tbox_group/testcase/rootfs/kconfig/compiler/runtime/group/nr_groups: > vm-snb/trinity/openwrt-i386-generic-20190428.cgz/i386-randconfig-r071-2= 0250410/gcc-14/300s/group-03/5 > > > 1f382215119a0bc1 318e18ed22e89397635e15095c0 > ---------------- --------------------------- > fail:runs %reproduction fail:runs > | | | > :1000 8% 82:1000 dmesg.BUG:kernel_hang_in_bo= ot_stage > :1000 7% 69:1000 dmesg.BUG:soft_lockup-CPU##= stuck_for#s![swapper:#] <---- > :1000 8% 82:1000 dmesg.BUG:workqueue_lockup-= pool > :1000 7% 69:1000 dmesg.EIP:tick_clock_notify > :1000 2% 15:1000 dmesg.INFO:rcu_preempt_dete= cted_stalls_on_CPUs/tasks > :1000 5% 53:1000 dmesg.INFO:task_blocked_for= _more_than#seconds > :1000 7% 69:1000 dmesg.Kernel_panic-not_sync= ing:softlockup:hung_tasks > > > > If you fix the issue in a separate patch/commit (i.e. not just a new vers= ion of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-lkp/202512161547.cd3a9187-lkp@intel.= com > > > [ 699.774873][ C0] watchdog: BUG: soft lockup - CPU#0 stuck for 626s!= [swapper/0:1] > [ 699.775553][ C0] CPU#0 Utilization every 96000ms during lockup: > [ 699.775553][ C0] #1: 26% system, 0% softirq, 0% hard= irq, 0% idle > [ 699.775553][ C0] #2: 25% system, 0% softirq, 0% hard= irq, 0% idle > [ 699.775553][ C0] #3: 25% system, 0% softirq, 0% hard= irq, 0% idle > [ 699.775553][ C0] #4: 34% system, 0% softirq, 0% hard= irq, 0% idle > [ 699.775553][ C0] #5: 100% system, 0% softirq, 0% hard= irq, 0% idle > [ 699.775553][ C0] Modules linked in: > [ 699.775553][ C0] irq event stamp: 201566 > [ 699.775553][ C0] hardirqs last enabled at (201565): timekeeping_no= tify (arch/x86/include/asm/irqflags.h:42 arch/x86/include/asm/irqflags.h:11= 9 arch/x86/include/asm/irqflags.h:159 include/linux/stop_machine.h:172 incl= ude/linux/stop_machine.h:179 kernel/time/timekeeping.c:1634) > [ 699.775553][ C0] hardirqs last disabled at (201566): sysvec_apic_ti= mer_interrupt (arch/x86/kernel/apic/apic.c:1052) > [ 699.775553][ C0] softirqs last enabled at (200324): handle_softirq= s (kernel/softirq.c:469 (discriminator 2) kernel/softirq.c:650 (discriminat= or 2)) > [ 699.775553][ C0] softirqs last disabled at (200309): __do_softirq (= kernel/softirq.c:657) > [ 699.775553][ C0] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6= .18.0-rc2-00020-g318e18ed22e8 #1 PREEMPT(full) > [ 699.775553][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 19= 96), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > [ 699.775553][ C0] EIP: tick_clock_notify (arch/x86/include/asm/bitop= s.h:55 include/asm-generic/bitops/instrumented-atomic.h:29 kernel/time/tick= -sched.c:1633) > [ 699.775553][ C0] Code: 8b 45 e4 89 1d 24 d5 6a 83 a3 38 d5 6a 83 89= 15 3c d5 6a 83 83 c4 10 5b 5e 5f 5d c3 2e 8d b4 26 00 00 00 00 8d b6 00 00= 00 00 <80> 0d 44 d5 6a 83 01 c3 2e 8d b4 26 00 00 00 00 80 0d 44 d5 6a 83 > All code > =3D=3D=3D=3D=3D=3D=3D=3D > 0: 8b 45 e4 mov -0x1c(%rbp),%eax > 3: 89 1d 24 d5 6a 83 mov %ebx,-0x7c952adc(%rip) # 0x= ffffffff836ad52d > 9: a3 38 d5 6a 83 89 15 movabs %eax,0xd53c1589836ad538 > 10: 3c d5 > 12: 6a 83 push $0xffffffffffffff83 > 14: 83 c4 10 add $0x10,%esp > 17: 5b pop %rbx > 18: 5e pop %rsi > 19: 5f pop %rdi > 1a: 5d pop %rbp > 1b: c3 ret > 1c: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > 23: 00 > 24: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi > 2a:* 80 0d 44 d5 6a 83 01 orb $0x1,-0x7c952abc(%rip) # 0x= ffffffff836ad575 <-- trapping instruction > 31: c3 ret > 32: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > 39: 00 > 3a: 80 .byte 0x80 > 3b: 0d 44 d5 6a 83 or $0x836ad544,%eax > > Code starting with the faulting instruction > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > 0: 80 0d 44 d5 6a 83 01 orb $0x1,-0x7c952abc(%rip) # 0x= ffffffff836ad54b > 7: c3 ret > 8: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > f: 00 > 10: 80 .byte 0x80 > 11: 0d 44 d5 6a 83 or $0x836ad544,%eax > [ 699.775553][ C0] EAX: 0003135d EBX: 8322ef00 ECX: 00000006 EDX: 82f= 6bcac > [ 699.775553][ C0] ESI: 00000200 EDI: 836ac3e0 EBP: 84c97ed8 ESP: 84c= 97ebc > [ 699.775553][ C0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAG= S: 00000202 > [ 699.775553][ C0] CR0: 80050033 CR2: ffdaa000 CR3: 03aeb000 CR4: 000= 406d0 > [ 699.775553][ C0] Call Trace: > [ 699.775553][ C0] ? timekeeping_notify (kernel/time/timekeeping.c:1= 636) > [ 699.775553][ C0] __clocksource_select (kernel/time/clocksource.c:1= 069 (discriminator 1)) > [ 699.775553][ C0] ? boot_override_clock (kernel/time/clocksource.c:= 1101) > [ 699.775553][ C0] clocksource_select (kernel/time/clocksource.c:108= 6) > [ 699.775553][ C0] clocksource_done_booting (kernel/time/clocksource= .c:1110) > [ 699.775553][ C0] do_one_initcall (init/main.c:1283) > [ 699.775553][ C0] ? rdinit_setup (init/main.c:1331) > [ 699.775553][ C0] do_initcalls (init/main.c:1344 (discriminator 3) = init/main.c:1361 (discriminator 3)) > [ 699.775553][ C0] kernel_init_freeable (init/main.c:1597) > [ 699.775553][ C0] ? rest_init (init/main.c:1475) > [ 699.775553][ C0] kernel_init (init/main.c:1485) > [ 699.775553][ C0] ret_from_fork (arch/x86/kernel/process.c:164) > [ 699.775553][ C0] ? rest_init (init/main.c:1475) > [ 699.775553][ C0] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) > [ 699.775553][ C0] entry_INT80_32 (arch/x86/entry/entry_32.S:945) > [ 699.775553][ C0] Kernel panic - not syncing: softlockup: hung tasks > [ 699.775553][ C0] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G = L 6.18.0-rc2-00020-g318e18ed22e8 #1 PREEMPT(full) > [ 699.775553][ C0] Tainted: [L]=3DSOFTLOCKUP > [ 699.775553][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 19= 96), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > [ 699.775553][ C0] Call Trace: > [ 699.775553][ C0] dump_stack_lvl (lib/dump_stack.c:122) > [ 699.775553][ C0] dump_stack (lib/dump_stack.c:130) > [ 699.775553][ C0] vpanic (kernel/panic.c:487) > [ 699.775553][ C0] panic (kernel/panic.c:626) > [ 699.775553][ C0] watchdog_timer_fn (kernel/watchdog.c:753) > [ 699.775553][ C0] __hrtimer_run_queues+0x125/0x1e0 > [ 699.775553][ C0] ? schedule_work (drivers/usb/core/hub.c:925) > [ 699.775553][ C0] hrtimer_run_queues (kernel/time/hrtimer.c:1999) > [ 699.775553][ C0] update_process_times (kernel/time/timer.c:2416 ke= rnel/time/timer.c:2472) > [ 699.775553][ C0] tick_periodic (kernel/time/tick-common.c:103) > [ 699.775553][ C0] tick_handle_periodic (kernel/time/tick-common.c:1= 44) > [ 699.775553][ C0] ? vmware_sched_clock (arch/x86/kernel/apic/apic.c= :1052) > [ 699.775553][ C0] __sysvec_apic_timer_interrupt (arch/x86/include/a= sm/trace/irq_vectors.h:40 (discriminator 4) arch/x86/include/asm/trace/irq_= vectors.h:40 (discriminator 4) arch/x86/kernel/apic/apic.c:1059 (discrimina= tor 4)) > [ 699.775553][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic= /apic.c:1052 (discriminator 2) arch/x86/kernel/apic/apic.c:1052 (discrimina= tor 2)) > [ 699.775553][ C0] handle_exception (arch/x86/entry/entry_32.S:1055) > [ 699.775553][ C0] EIP: tick_clock_notify (arch/x86/include/asm/bitop= s.h:55 include/asm-generic/bitops/instrumented-atomic.h:29 kernel/time/tick= -sched.c:1633) > [ 699.775553][ C0] Code: 8b 45 e4 89 1d 24 d5 6a 83 a3 38 d5 6a 83 89= 15 3c d5 6a 83 83 c4 10 5b 5e 5f 5d c3 2e 8d b4 26 00 00 00 00 8d b6 00 00= 00 00 <80> 0d 44 d5 6a 83 01 c3 2e 8d b4 26 00 00 00 00 80 0d 44 d5 6a 83 > All code > =3D=3D=3D=3D=3D=3D=3D=3D > 0: 8b 45 e4 mov -0x1c(%rbp),%eax > 3: 89 1d 24 d5 6a 83 mov %ebx,-0x7c952adc(%rip) # 0x= ffffffff836ad52d > 9: a3 38 d5 6a 83 89 15 movabs %eax,0xd53c1589836ad538 > 10: 3c d5 > 12: 6a 83 push $0xffffffffffffff83 > 14: 83 c4 10 add $0x10,%esp > 17: 5b pop %rbx > 18: 5e pop %rsi > 19: 5f pop %rdi > 1a: 5d pop %rbp > 1b: c3 ret > 1c: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > 23: 00 > 24: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi > 2a:* 80 0d 44 d5 6a 83 01 orb $0x1,-0x7c952abc(%rip) # 0x= ffffffff836ad575 <-- trapping instruction > 31: c3 ret > 32: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > 39: 00 > 3a: 80 .byte 0x80 > 3b: 0d 44 d5 6a 83 or $0x836ad544,%eax > > Code starting with the faulting instruction > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > 0: 80 0d 44 d5 6a 83 01 orb $0x1,-0x7c952abc(%rip) # 0x= ffffffff836ad54b > 7: c3 ret > 8: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > f: 00 > 10: 80 .byte 0x80 > 11: 0d 44 d5 6a 83 or $0x836ad544,%eax > > > The kernel config and materials to reproduce are available at: > https://download.01.org/0day-ci/archive/20251216/202512161547.cd3a9187-lk= p@intel.com > > > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >